Pisces - Who are fish and how do they live

Fish belong to the large class of vertebrates and are heterothermic animals, in other words cold-blooded animals that is to say that the body temperature is regulated by the external temperature. They alone make up more than half of all the rest of the vertebrates put together (mammals, birds, reptiles and amphibians).


Fish are aquatic animals that live in both fresh and marine waters all over the world, from the warmest to the coldest regions, to the most ideal conditions and the most hostile to life.

The greatest concentration of seawater fish species is found along the coral reefs thanks to the abundance of food, while those of sweet water are found in greater concentration in the great African lakes and in the water courses of the tropical rainforests, especially in the basin of the Amazon River.


On the approximately 22,000 species it is very difficult to give morphological indications of a general nature as they are too different from each other. In fact, it goes from fish that have a completely rounded shape as in puffer fish to those that resemble a snake as in eels or in completely flattened forms as in sole. Generally speaking, the shape is more frequently compressed, which tapers at the head and tail.

The dimensions are very varied, ranging from fish of a few millimeters (Pandaka pygmea) to fish measuring over 15 m (whale shark).

A peculiarity of the fish is the color as there is a great variety: in fact, it passes from fish of a thousand colors of tropical regions (probably a need for intraspecies recognition or as a warning for potential predators in the case of poisonous fish) to more sober and classic, dark colors in the back part and clear in the ventral part (probably a camouflage system as a predator looking down sees dark and vice versa looking towards the other sees clear confusing it with the sunlight).

The body of the fish is generally covered by scales (although in some species they are absent) and is equipped with fins that are nothing more than membranes that have a propulsive or directional function. Usually one is placed in the dorsal part of the body, in the middle part; one is placed at the extremity of the animal and is generally the propelling organ; one or more fins are then found in the ventral part along the midline and you can then find pectoral fins on the sides, behind the gills and others placed between the head and the anus at the level of the abdomen (also in this case there are numerous differentiations in fact of fins between species and species).

A peculiarity of the fish body are the scales (scales) arranged in a partially superimposed way (imbricate). In some species the scales are bone plates; in others, as in eels, they are so small as to give the effect of a smooth skin; or there are fish where there are just none. In any case, where they are present they represent a sort of armor that protects and supports the body of the fish.


The fish as vertebrates have a skeleton (endoskeleton) formed by a skull, a vertebral column, ribs and bony structures that serve to support the fins.

Breathing occurs through a gill system that allows oxygen to be retained from the water and expelled carbon dioxide through the blood, but there are also fish that are able to breathe atmospheric air through well-developed lungs.

Fish have a digestive system that begins with a mouth equipped with teeth, more or less developed depending on the species, continues with a pharynx, an esophagus, a stomach and an intestine that ends in the anal opening. All fish also have a liver and pancreas.

There is a circulatory system consisting of a heart and a main artery that runs under the spinal column. The heart sends blood first to the gills to be freed of carbon dioxide and enriched with oxygen, then to the head and then to the rest of the body through the artery.

In fish we find a fairly simple nervous system consisting of a brain and a spinal cord. The size and development of both vary from species to species.

Another peculiarity of the fish is the swim bladder which is a sort of sack that originates as a protuberance of the alimentary canal which has the function of allowing the fish to remain at the depth it wishes without problems, practically adapting the fish to the pressure variations of the different depths. .

Fish can have more or less developed eyesight depending on the species. In fish without ears, noises are perceived in the form of sound vibrations through the bones of the skull, thus reaching a sort of inner ear. The smells are perceived through the nostrils and in some fish they are particularly developed.


Most fish have separate sexes but there are also cases of fish hermaphrodites. They are for the most part oviparous, that is to say they produce eggs outside the female's body and generally there is no parental care so once the eggs have been laid, they are abandoned to themselves (there are very rare cases of defense of the nest and of the young). However, there are also forms of viviparity (e.g. sharks) that is to say that they have internal fertilization and give birth to young in an advanced stage of development and ovoviviparity, that is to say that the eggs hatch in the oviduct of the female which gives birth to perfectly formed individuals. .

Below are the monographic files of the main fish.

Individual bird species information sheets

Carnivorous animals: who they are, how they are made and how they live

A carnivorous it is an animal that feeds exclusively or mainly on meat. Both predators that actively capture their prey and those species that eat exclusively dead animals belong to carnivores. Meat-eating animals belong to many different groups and therefore there is not one classification unique that groups them all. The term carnivorous, however, it can also refer to a single taxonomic category called Carnivora. This group refers to all placental mammals initially specialized and suitable for eating meat such as canids, felids, hyenids, ursids, mustelids, pinnipeds and others. This characteristic was not necessarily maintained over time and, as often happens, in the great game of evolution, new and unexplored directions were then taken. As happened for the raccoons and most bears, who follow an omnivorous diet, or i Panda, both the giant and the red one, which instead have an even herbivorous diet even though they belong to the order of carnivores.


  • 1 The taxa of the fish group
  • 2 Habitat and distribution
  • 3 Fishing and fish farming
  • 4 Anatomy
    • 4.1 Morphology
    • 4.2 Mouth
    • 4.3 Teeth
    • 4.4 Fins
      • 4.4.1 Special fins
    • 4.5 Flakes and skin
    • 4.6 Internal bodies
      • 4.6.1 Nervous system
      • 4.6.2 Sense organs
      • 4.6.3 Respiratory system
      • 4.6.4 Swim bladder
      • 4.6.5 Digestive system
      • 4.6.6 Circulatory system
      • 4.6.7 Excretory system
      • 4.6.8 Genital system
    • 4.7 Skeleton and musculature
    • 4.8 Immune system
  • 5 Biology
    • 5.1 Playback
    • 5.2 Do fish drink?
    • 5.3 Sleep
    • 5.4 Fresh, salty or brackish waters
    • 5.5 Thermoregulation
  • 6 Ethology
    • 6.1 Communication
      • 6.1.1 Sounds
      • 6.1.2 Coloring
      • 6.1.3 Body language
    • 6.2 Behavior
    • 6.3 Intelligence
    • 6.4 Particular cohabitation
    • 6.5 Aggregations and banks
    • 6.6 Migrations
    • 6.7 Food strategies
  • 7 Fish and man
    • 7.1 Source for human nutrition
    • 7.2 Ecology and dangers
      • 7.2.1 Conservation status
      • 7.2.2 Major threats
    • 7.3 Fish in culture, art and religion
    • 7.4 Fish as pets: the Aquarium hobby
  • 8 Classification
  • 9 Notes
  • 10 Bibliography
  • 11 Related items
  • 12 Other projects
  • 13 External links

Having no taxonomic value, the paraphyletic groups, considered in the broad sense of fish, are not strictly defined [1] but, generally, are inclusive of representatives of:

  • Agnatha (peculiar and primitive not equipped with bony or cartilaginous jaws)
    • Cephalaspida (large group of which only the current lampreys survive)
    • Heterostraci (large group of which only the current missines survive)
    • Anaspida (Agnates generally not armored extinct in the Devonian, and perhaps at the origin of the gnathostomes)
  • Gnathostomata (organisms with a more evolved skeleton equipped with bony or cartilaginous jaws)
    • Acanthodii or Acantoda (evolved, and fast swimmers, extinct in the Permian)
    • Placodermi or Placodermata (partly armored, extinct in the carboniferous)
    • Chondrichthyes (large group including the current cartilaginous fishes)
    • Dipnoi (large group of which only six species survive, anatomically closely related to Crossopterygii)
    • Crossopterygii (only two current species, the coelacanths of the genus Latimeria at the end of the Paleozoic the class originated the amphibians destined to colonize the terrestrial environment)
    • Actinopterygii (constituting the majority of living bony fish).

- The last three classes were named Osteichthyes, Osteichthyes or bony fishes, and the terminology still persists, even in some taxonomies.
In addition to the strictly defined groups mentioned, they are considered fishes, several other groupings, all exclusively fossils, gathered under the clade Tetrapodomorpha, a clade that proceeds from morphologically definable organisms fishes up to others evidently and anatomically amphibians, and ancestral to tetrapods.
-Dipnoi and Crossoprterygii in many taxonomies, are grouped under the class Sarcopterygii, which other taxonomies also enrich the clade Tetrapodomorpha

That is, the fish in the broad sense include all the representatives of subphylum of vertebrates, excluding the group of Tetrapoda, or vertebrates, primitively endowed with the four limbs and variously adapted to the terrestrial environment, classically, amphibians, reptiles, birds and mammals.

Fish are distinguished among vertebrates for the long period of evolution (started over 500 million years ago [2]) which allowed their diversification into all current forms, developed and adapted to multiple types of condition and diet, specializing and occupying almost all the ecological niches of the various aquatic environments.

Fish have colonized any sea, ocean, river or lake on the planet, with different shapes, colors and sizes.

There are species typical of mountain streams (such as Salmonidae or Cyprinidae) or lakes (such as the common carp - Cyprinus carpio [3]), suitable for life on the seabed in search of food. Sometimes the species can be endemic to restricted habitats in Italy, for example, Psalm fibreni in the lake of Posta Fibreno [4] e Salmo carpio in Lake Garda [5].

The environments with variable salinity, such as river estuaries and lagoons, welcome species specialized in withstanding even large changes in the concentration of dissolved salt, called euryhaline (the Mugilidae, for example, including the common mullet - Mugil cephalus), on the contrary, the species unable to adapt to environments with variable salinity are called stenoalines.

At sea, in the typical areas of the pelagic domains, far from the coasts and without any hiding place, the fish are often characterized by silver liveries to reflect the blue of the surrounding waters as much as possible and thus hide from predators. Many have a slender shape, suitable for fast swimming to facilitate escape or hunting (such as tuna), others seek safety by gathering in numerous flocks. [6]

Near the coasts, the rocky bottoms, rich in seaweed, are frequented by a great abundance of typically vegetarian fish (such as set sail - Sarpa sets sail [7]), but also of predators of other animal species that live among the algae, such as molluscs or annelids. The prairies of Posidonia oceanica they offer additional nourishment and, more often, hiding places for other fish species (such as al pony pipefish - Syngnathus typhle) or to juvenile forms of these [7]. The moving bottoms, composed of mud, gravel or sand, offer an additional habitat for fish that have specialized in hunting (e.g. monkfish - Lophius piscatorius) or in hiding, changing one's physical structure to move in close contact with the ground (such as sole - Solea solea) or burrowing into it quickly (for example the rasposo goby - Gobius bucchichi).
Caves and dark ravines of shoals and cliffs offer shelters to burrow fish (la brown grouper - Epinephelus marginatus) or nocturnal fish (such as moray eels and Scorpaenidae) that hide there during the day and then go out hunting at night.
Coral reefs, supporting a huge number of species, offer the best example of the diversity between the shapes and colors of these animals.

Other species, suitable for abyssal life (such as Saccopharyngiformes and Lophiiformes), have developed forms completely different from their surface relatives, perfecting hunting techniques based, for example, on bioluminescence to attract prey [8].
Even the waters of the Antarctic are home to some species of fish specialized for life in the cold and which can go up to over four thousand meters deep [9].

Although almost all fish are exclusively aquatic, there are exceptions. Periophthalms, for example, have developed adaptations that allow them to live and move on land for several days.

"Commercial fishing is the activity of catching fish that live in marine waters" [10]

Fish farming is the farming of fish in enclosed spaces where the fish live, feed and reproduce.

"Farmed fish constitutes 50% of the fish sold" [10]

Very different, all fish have common characteristics, necessary for survival. However, the long evolution times have allowed the division into over 30,000 different species [11], some of which are divided into subspecies. We can therefore understand the difficulty in integrating all this biodiversity into a single scheme.

Morphology Edit

The habitat where the species is settled and the type of diet have shaped, through evolution, the body of the fish, making them extremely diversified [2]. In general, their body shape, adapted to aquatic life, is hydrodynamic. The anatomically most common forms are:

  • Fusiform - the most common form, adopted by fish living in rivers, lakes and by many pelagic species, great swimmers. Offers little water resistance
  • Flattened on the back - ideal form for fish that live close to the surface and which derive nourishment from it. It is no coincidence that some species have protruding eyes in order to locate insects and other prey
  • Compressed laterally - adopted by many coral reef fish or large cichlids, it is the ideal shape for fish that move between submerged plants or rocks, in areas without currents
  • Flattened on the abdomen - adopted by detritivorous fish, it has a flat abdomen for better grip on the seabed or on the rocks, where these fish live and feed
  • Compressed at the sides and faired - it is a particular shape, hydrodynamic and aerodynamic, since often the species that have this shape are able to dart and glide for a few tens of meters on the surface and out of the water
  • Anguilliforme - elongated and flexible body, like that of eels. An ideal shape for fish that scour ravines or live in the sand for food or safe from predators
  • Needle-shaped - this is also an elongated shape but the body is rigid. The species with a needle-like body live close to the surface or are confused with algae
  • Disqualiform - a practically perfect shape for hunting: hydrodynamic, tapered body, accustomed to long swims but also to sprints, with powerful muscles
  • Flat - typical shape of the sole and of the rays, it is adopted by fish that live on the bottom, to camouflage themselves or to prey. Flanked fish have both eyes on the opposite flank, while stingrays and stingrays are flattened on the belly and have a long tail
  • Ovaloid - or parallelepiped, are the shapes of fish that have a stocky and muscular body, often covered with spines or bony plates.
  • Cavallina - is the typical shape of seahorses and pipefish, which have a head with horse-like shapes and a slender body, with an almost always erect posture and prehensile tail.

The size of the fish varies from the 16 m of the whale shark (Rhincodon typus) to about 8 mm of the Schindleria brevipinguis, considered the smallest vertebrate in the world [12]

Mouth Edit

In fish, the mouth has evolved according to lifestyle and colonized habitat [2]. Usually we tend to classify the different types of mouth according to the direction it takes, as fish that live on the surface have mouth facing up, fish that live at half height have the mouth parallel to the body and bottom fish have the mouth oriented downwards.

This is true, but there are numerous other types, such as the sucker mouth, typical of bottom fish, where the lips have widened to form an anchoring organ.

Other fish have developed tubular mouths, to better suck or nibble among the rocky crevices. Predatory fish exhibit extroflexible mouths, which allow them to lengthen their jaws for greater reach.Highly specialized is the mouth of predators such as piranhas and sharks, the latter provided with multiple rows (up to 7) of bone teeth and a mouth opening sufficient to contain seals or humans.

Teeth Edit

The dentition of fish varies from species to species. The teeth can be absent or abundant and different in shape and arrangement. They can be present on both jaws (maxillary teeth is premaxillary), on the share (vomerini), on the palate (palatini), on the bones of the pharynx (pharyngeal). The shape is generally conical and in the hunting species the teeth are caniniforms, that is pointed, often serrated and suitable for grabbing prey and tearing parts of fabrics. In some species, such as groupers, these teeth are needle-like and turned backwards. The species that feed on algae, on the other hand, have teeth incisors, flattened and suitable for scraping and tearing algae and other organisms that live adhering to the seabed. Some fish, such as white bream (Diplodus sp.) also have teeth molariforms, used to crush the shells of molluscs and crustaceans. In the Selaci the teeth, triangular and laterally serrated, are arranged in several rows. The teeth of the anterior row, the only functioning ones, periodically undergo injuries and the teeth of the posterior rows fall out and have the task of replacing them. [2]

Fins Edit

The organs of locomotion of fish are the fins, structures formed by bone rays in osteichthyes or cartilaginous in selachians, connected by a skin membrane. In osteichthyes the rays can be spiny or soft and their number has systematic value and is therefore useful for the identification of fish.

The fins are divided into

  • you learn (1 or more dorsal, 1 caudal, 1-2 anal)
  • even (pectoral and ventral). These fins in terrestrial vertebrates will give rise to limbs.

The dorsal fins can vary in number from 1 to 3 and can sometimes merge with the anal and caudal, forming a single large fin.

The caudal fin is responsible for the main propulsive thrust of the fish, it is arranged vertically with respect to the plane of the fish and moves from right to left and vice versa. This feature makes it possible to distinguish at first sight a fish from a cetacean, in which the caudal fin is arranged horizontally and moves from the bottom up.

Special fins Edit

In addition to the normal fins, some families (Salmonidae, Characidae, etc.) have an additional fin after the dorsal one: it is called adipose fin since it is composed only of a flap of adipose tissue. Its dimensions vary according to the species and it seems to be used to increase stability during horizontal movements.

Other species have the first (or more) ray of the dorsal and pectoral fins as a thorn or even a hollow spike connected to a venomous duct (Scorpaenidae) used for defensive purposes but also in delicate reproductive moments.

Also for reproductive purposes, other families of fish (Poeciliidae, Goodeidae, Anablepidae, etc.) have developed a particular reproductive organ, called gonopodium and suitable for the internal fertilization of these ovoviviparous fish: it consists in a modification of the anal fin in a tube equipped with microscopic hooks at the end which is embedded in the female genital papilla and allows the passage of the seminal fluid into the female's body. The gonopodium is not erectile but rigid and mobile.

In some species, especially those belonging to the Scombridae family, on the caudal peduncle between the dorsal, anal and caudal fins there are pinnules without rays.

Scales and skin Edit

Like all vertebrates, fish have a skin composed of two layers: the epidermis (the outer part) and the dermis (richly vascularized and located in the inner part of the skin). However the majority of bony fish (Osteichthyes) are covered with flakes, placed over the epidermis, of bone material (similar to dentin) interlocked with each other like roof tiles, which grow as nails and hair grow to animals.
Their function is to cover the body of the fish making it smooth and hydrodynamic in this they are helped by a mucus secreted by the dermis and made to flow up to the epidermis and then to the scales: a sort of sticky "invisible skin" that helps the fish to slip into the water.
The flakes are divided into [13]:

  • ctenoids - they have edges with tiny teeth
  • cycloids - they are circular, with rounded and overlapping edges so as to show only 20% of their entire surface. They also have growth rings such as tree trunks, through which it is possible to trace the age of the fish
  • ganoids - the scale is almost entirely exposed to the surface of the water because of a rhomboid shape, they are also very bright because they are covered with ganoin, a substance that makes the scales similar to glass
  • placoids - present only on the Selachians (sharks, rays, etc.).
  • cosmoids - particular type of scale typical of Crossopterygii, especially of Coelacantids, but also present in Dipnoi

But not all fish have scales: some species, especially those that live on the seabed, have rather bony or extremely keratinized plates, so much so that they are also called "armored fish", others have only thickened bare skin. Even the whole body can be covered with real bony plates as in certain "box fish" or with scales evolved into spines, as in puffers or porcupines.

Internal organs Edit

Nervous system Edit

The central nervous system of most fish consists of the brain and spinal cord, although the shape and size of the various parts of the brain vary considerably in different species.

When compared with other vertebrates, fish have a rather small brain in relation to the size of the body. Some sharks, however, possess a relatively large brain in relation to body size, comparable to that of birds and marsupials. [14]

The brain of fish is divided into several regions. In the frontal part there are the olfactory lobes, structures that receive and process the signals that come from the nostrils through the olfactory nerves. [15] The olfactory lobes are highly developed in fish that hunt based primarily on smell, such as sharks and catfish.

Behind the olfactory lobes is the bilobed telencephalon, which in fish is closely related to smell. [15] These two structures, in fish, form the brain.

The diencephalon connects the brain to the midbrain and is responsible for several functions associated with hormonal control and maintenance of homeostasis. [15]
Above the diencephalon is the pineal gland, which performs several functions including maintaining circadian rhythms and controlling color changes. [15]

The midbrain contains two optic lobes, highly developed in fish that hunt relying on sight, such as cichlids or rainbow trout (Oncorhynchus mykiss). [15]

The metencephalon is mainly involved in the control of swimming and balance. [15]

The cerebellum is a structure consisting of a single lobe, usually has large dimensions and in fact constitutes the largest part of the entire brain.

The myelencephalon controls the functions of most muscles and organs, and in bony fish it also regulates respiration and osmoregulation. [15]

Sense organs Edit

Hearing is perceived through the swim bladder [2], which transfers vibrations to the Weber apparatus, connected to the brain.

The taste is normally perceived and processed in the mouth and pharyngeal cavity and mainly serves to distinguish foods and avoid harmful substances. Very often fish put anything that happens in front of them into their mouths: they hold this substance just long enough to understand if it is digestible and, if not, they spit it out. The same thing happens in sharks, which first bite for to taste and based on the flavor they decide whether what they bite is prey or not (fortunately the numerous survivors of shark attacks are due to this: we are not to their liking!). In many species, the taste organs are also located on the outside of the head and in the barbels around the mouth. The osphronemids even have taste receptors on the ventral fins, transformed into thin mobile appendages that the fish uses by feeling what is around.

The fish also have nostrils, which have no respiratory function (except in fish with sucker mouthparts) but purely olfactory: they are tubular recesses covered with olfactory rosettes that perceive the odorous particles coming from blood, putrefaction of organisms, mucus of other fish, plants. The water is conveyed inside and then expelled.

Sight is a sense that fish have developed differently [2], based on their lifestyle [16]. Most of them have their eyes each on one side: this allows them to have a field of view of almost 360 ° and a monocular vision (each of the two eyes focuses independently of the other) and wide angle, not high definition but which allows you to control the possible approach of a danger.

On the other hand, predators and fish lying on their side have close-set eyes and binocular vision, with a high-definition field of view in front of their head, suitable for approaching prey.
However, many species of fish live in caves or in the sea depths, where very little light filters or eternal darkness reigns. Some fish (for example, the Opisthoproctus) have developed telescopic and highly magnifying eyes, suitable for exploiting the faint light coming from above. Some species that live in caves or deep abysses (such as theAstyanax) have even atrophied their eyes until they disappear, since in their habitat they are useless.

Fish also have a sense organ not present in other vertebrates: the lateral line [2]. It consists of a series of channels that run laterally in the head and body of the animal, connected with the outside through small pores, and has the function of perceiving very low frequency variations or weak electric fields.

In 2003, Scottish researcher Lynne Sneddon of the University of Edinburgh conducted research on Oncorhynchus mykiss and concluded that fish possess nociceptors and exhibit behaviors in response to pain. [17] This work was criticized by Professor James D. Rose of the University of Wyoming, who said the study was flawed. [18] Dr. Rose published his study a year before Sneddon, arguing that fish cannot feel pain due to the lack of the appropriate neocortex in the brain. [19]

The Selachians, Dipnoi and lampreys (Petromyzontiformes) possess sensory receptors, the electroceptors, capable of detecting electric fields. Electroreceptors can be ampoule-shaped or tubular-shaped. The first, said ampoules of Lorenzini, can be considered as a continuation of the lateral line and are filled with a gelatinous substance that has good electrical conductivity. Electroreception is used for the identification of prey, for orientation and for movement. [2]

Respiratory system Edit

Most fish carry out gas exchanges through gills located on the sides of the pharynx. Cartilaginous fishes have 4 to 7 gill openings without an operculum, while bony fishes have only one opening on each side covered by an operculum.

The gills are made up of filamentous, strongly vascularized structures. When the fish takes in water rich in oxygen through the mouth, it passes it through the gills at which the oxygen intake and the elimination of carbon dioxide takes place. In the gills the circulation of the blood goes against the current of that of the water. This system allows the fish to absorb a large amount of dissolved oxygen.

Some fish are able to breathe air through various mechanisms. The skin of eels, like that of amphibians, is able to absorb oxygen in the buccal cavity of theElectrophorus electricus it can be used to breathe air. Catfishes of the Loricariidae, Callichthyidae and Scoloplacidae families are able to absorb air through their digestive tract. [20] Dipnoi possess a pair of lungs similar to those of tetrapods and must reach the surface of the water to swallow air through their mouths and eliminate breathed air through their gills. Lepistoseids have a vascularized swim bladder that is used as a lung. Loaches and many catfish breathe by passing air through the intestines. Many fish have developed accessory respiratory organs that are used to extract oxygen from the air. Labyrinth fish, such as gourami and fighting fish, have an organ, the labyrinth, which performs this function. Few other fish have structures reminiscent of the labyrinth. These include the Channidae, Osphronemidae and Clariidae catfish families.

The ability to breathe air is typical of those fish that live in shallow waters and with seasonal variability, where the concentration of oxygen can drop at certain times of the year. When this happens, fish that rely only on the breathing of the oxygen present in the water will quickly die of asphyxiation, while those capable of breathing air can survive for longer, in some cases even inside the mud. Some extreme cases are represented by fish able to survive for weeks after the water has dried completely, going into aestivation and awakening with the return of the water. Some fish, such as the African dipnoi, must necessarily breathe air periodically to survive and are called mandatory air respirators others, like theHypostomus plecostomus, they breathe the air only when they really need it and are told optional air respirators. Most of the fish that breathe air belong to this category, since air breathing has a considerable energy cost to reach the surface of the water and also in this way the fish would expose themselves to predation by surface predators. [20]

Swim bladder Edit

The swim bladder arises in the course of evolution to allow certain organisms, such as teleost vertebrates, to move along a water column. It is an organ typically belonging to the anatomy of fish, formed through the ingestion of an air bubble and the inversion of a part of the gastro-esophageal tract, which facilitates their movements in the liquid element.

There are two different types of swim bladders: if the same is connected to the gastroesophageal tract the fish will be of the physostomal type, while if it is not connected it will be fisoclisto.

Digestive system Edit

In fish, food is ingested through the mouth, then passing through the esophagus and stomach. Enzymes from the liver and pancreas also intervene in digestion. The nutrients are absorbed through the intestine and the feces are excreted through the anus.

Circulatory system Edit

In fish, the circulatory system is closed and simple. Blood is pumped from a two-chamber heart to the gills, from where it reaches the animal's entire body and then returns to the heart.

The heart is adjacent to the branchial region, enclosed in a pericardium. The blood follows the sinus venous path, atrium, ventricle, arterial cone, ventral aorta, five pairs of afferent branchial arches, branchial capillaries, four pairs of efferent branchial arches, dorsal aorta, various arteries. From the tail: tail vein, portal veins to the kidneys and other large veins that make their way to the venous sinuses, which connect to the venous sinus of the heart. From the digestive tract: hepatic portal vein, hepatic veins, venous sinus. The circulation is unique, the blood passes only once in the whole circuit through the heart, in which it is always venous, not oxygenated.

Excretory system Edit

Like almost all aquatic organisms, fish are ammoniotelici, that is, they eliminate the nitrogenous waste substances in the form of ammonia. Some waste substances are eliminated directly through the gills, while the kidneys have a predominantly osmoregulatory function.

It should be noted that marine fish tend to lose water by osmosis and therefore produce very concentrated urine, while the opposite happens in freshwater fish, which tend to absorb water. In those fish that migrate from the sea to freshwater streams the kidneys therefore have the ability to adapt to the change in salinity.

Genital system Edit

Fish gonads consist of testes and ovaries. Both are equal organs, of similar size and completely or partially fused together.

In some species the spermatogonia in the testes are distributed along the entire length of the seminiferous tubules, while in others they are found only in the anterior portion. [21]

In ovaries, the eggs can be released into the coelomic cavity, from where they will then reach the oviduct, or they are released directly into it. [22]

Skeleton and musculature Edit

Like other vertebrates, fish have an endoskeleton which can be cartilaginous or bony. The bony skeleton usually consists of a skull with toothed jaws, a spinal column, ribs, and variously shaped bones supporting the fins.

Most fish move by alternately contracting the muscles inserted into the sides of the spine. Each muscle mass is made up of a series of segments called myomeres.Their contraction produces a ripple that pushes the fish forward. Fins are used as stabilizers or to increase swimming speed.

Myomers are made up of two types of muscle fibers, the red fiber and the white fiber. The first, unlike white fiber, is rich in myoglobin and mitochondria and is highly vascularized. The red fiber is suitable for working in aerobic conditions, it contracts slowly but bears fatigue well, the white fiber works well in anaerobic conditions, it contracts faster but is not resistant to fatigue. The ratio of the two fibers in fish varies according to the type of swimming. Tuna, for example, which are strong swimmers, have high percentages of red fibers, while fish that live near the bottom and make short trips or sudden jerks have higher percentages of white fibers.

Immune System Edit

The organs of the immune system vary between different types of fish. [23] Agnathas lack proper lymphoid organs, such as thymus and bone marrow, but these primitive fish rely on regions of lymphoid tissue within other organs to produce immunity cells. For example, erythrocytes, macrophages and plasma cells are produced by the anterior kidney, while some areas of the intestine, where granulocytes mature, resemble a primitive bone marrow.

In cartilaginous fish there are the thymus and a well-developed spleen, which is the main organ of immunity, where various lymphocytes, plasma cells and macrophages develop.

Actinopterygii have a mass of tissue associated with the meninges in which granulocytes develop and their heart is frequently lined with tissue containing lymphocytes, reticular cells and a small number of macrophages. The kidney of these fish is an important hematopoietic organ.

The main immune tissue of the Teleostei is the kidney, which houses several immune cells. [24] In addition, teleosts possess thymus, spleen, and areas of immune tissue scattered among mucosal tissues, such as skin, gills, intestines, and gonads. Erythrocytes, neutrophils and teleost granulocytes are believed to reside in the spleen, while lymphocytes are found within the thymus. This division is very similar to that found in the mammalian immune system. [25] [26] Recently, a mammalian-like lymphatic system has been described in a species of teleost. Although not yet confirmed, it is thought that there is the presence of lymph nodes where immature T lymphocytes accumulate before meeting the antigen. [27]

Playback Edit

Most fish are oviparous, that is, they reproduce by means of eggs that are fertilized and which develop outside the mother's body. Some fish drop their eggs randomly, others build a nest or cover them with sediment. Only a few species take parental care protecting the nest or the young fry. Some fish (in particular Chondrichthyes, such as sharks, but also some Osteichts such as coelacanths) have internal fertilization and are viviparous. A small minority of fish are ovoviviparous. Most fish species have separate sexes, so males and females are present. Among the Teleostei, however, some species are hermaphrodites. Among the serranids there is above all synchronous hermaphroditism, in which the male and female gonads develop simultaneously and in very rare cases self-fertilization is possible, while in other fish the gonads develop in later times (sequential hermaphroditism) and sexual inversion. If the fish is born male and later transforms into a female, this is the proterandry, if the opposite happens, we have the proterogyny. The proterandry is present in about 8 families, including sparids and pomacentrids, the proterogyny is instead much more widespread, being present in about 14 families, including labrids and serranids.

Some fish reproduce in old age, while others are able to mate already after the first year of age. Some species, such as salmon in the genus Oncorhynchus they are semelpare, that is, they reproduce only once in their life, usually at the end of their life cycle. Others, on the other hand, are iteroparous, that is, they are able to reproduce several times.

The reproductive periods vary according to the geographical areas in which these animals live. In the Mediterranean, reproduction occurs for most of the species in spring and winter, although for some the reproductive period can extend until summer. In tropical areas, reproduction occurs almost in all seasons. The reproductive periods generally follow the seasonal variations in the abundance of phytoplankton and zooplankton. In the Mediterranean, in fact, there is a greater production of these organisms in spring and autumn, while in the tropics the presence of planktonic organisms is constant.

Fish are organisms with indeterminate growth, that is, their growth never stops. The greatest growth rate occurs before sexual maturity is reached. Once the gonads are formed, in fact, most of the energy is used for the production of gametes, considerably slowing down the growth rate. [2]

Do fish drink? Edit

The body of living beings is composed of a certain percentage of water as well as that of fish, which live immersed in a fluid (water) in which a few mg of mineral salts per liter are dissolved. According to the phenomenon known as osmosis, when two solutions with different concentrations are separated by a semi-permeable membrane, the solvent of the less concentrated solution moves towards the other, thus tending to balance the concentration of the two. This also happens in the body of fish, since the skin is nothing more than a semi-permeable membrane. Living in different types of water, however, freshwater and saltwater fish will dispose of water differently.

Saltwater fish live immersed in a solution with a higher concentration than that present in their body because of this, they are subject to continuous loss of fluids from the skin and especially from the gills. To replace the lost fluids they have to drink a lot: the kidneys will filter the salt water and produce very little urine, very concentrated, which will allow the expulsion of the salt.

Conversely, freshwater fish live immersed in a less concentrated solution than that of the body: they do not need to drink as it tends to penetrate the skin, diluting liquids and forcing the fish to expel large quantities of water through urine.

Sleep Edit

Fish also sleep, but their sleep can be of two different types. We have alert rest, which corresponds to a kind of wakefulness where the brain is made to rest but the senses are active, and sleep itself, understood as suspension of activities.

Being without eyelids, it is not possible to understand at first sight the state of a fish especially if, as happens to some sharks or other pelagic species, they continue to swim to allow the passage of water in the gills and therefore breathing.

In other species, however, sleep is well recognizable, as for some species of coral reef fish, which at night wrap themselves in a thick layer of mucus (with the function of neutralizing odors and flavors making them invisible to predators) from which they will come out in the morning. later or like some loaches, which sleep resting on their side.

We must not associate the dark and the night with sleep, as there are many nocturnal species, especially predators, which rest during the day and at night roam the seabed or the rocks to feed on sleeping fish.

Fresh, salty or brackish water Modification

Fish inhabit all the waters present on our planet, which are usually divided into fresh, salty and brackish. The difference lies in the quantities of dissolved salts per liter. Over time the fish have adapted to various environments, responding to the biological and physicochemical rules of nature.

However, there are fish that can change the type of water during life, from fresh to salty and vice versa, for reproductive or food reasons, such as salmon, eels and others that, living in lagoon waters, can afford to go into the sea or rivers. that flow into the lagoon (some puffers, etc.).

Thermoregulation Edit

Most fish are ectothermic organisms, that is, they are not able to regulate their body temperature, which is therefore similar to that of the environment around them.

Some fish, on the other hand, are homeotherms and therefore manage to keep their body temperature constant, which is independent from the external one. Homeothermic teleosts all belong to the Scombridae family and include swordfish, marlin, and tuna. Among the chondrichthyes, all the members of the Lamnidae and Alopiidae families are able to maintain a constant body temperature. Swordfish and marlin are only able to warm their eyes and brains, while tuna and large sharks are able to maintain their body temperature up to about 20 ° C higher than that of water. Endothermia is maintained by retaining the heat generated by the muscles while swimming and allows these fish to increase the contractile strength of the muscles, to increase the processing speed of the central system and to increase the speed of digestion. [28]

Communication Change

Sounds Edit

In a world where sounds are strongly muffled, very few fish are capable of emitting them: the species that succeed have modified parts of the body (swim bladder, some bones, fin rays) which, when properly moved, create dark rumblings or clicks sudden.

Coloring Edit

The species that do not need mimetic shapes and colors (livery), on the other hand, have bright and particular colors, also suitable for communicating particular conditions [29]. This characteristic, known as aposematism and common to other animal classes, has meant that poisonous fish, with unpleasant tasting meat or with particular defense systems (thorns, teeth, quills) are brightly colored, so as to immediately signal to any predators their danger. There are also some cases of harmless species that mimic dangerous species, or vice versa.

Another case is the sexual dimorphism, especially accentuated in the reproductive period, when the males take on a more lively color to better impress the females before mating.

Body language Edit

Body language is also fundamental, usually universal for all fish, although there are several exceptions: it is used to establish hierarchical relationships between conspecifics or between different species that have common interests (food, survival, territory). Usually the dominant specimen or in an aggressive attitude unfolds the fins and at times also the gills, in a threatening manner. The subordinate individual lowers the fins on the body and sometimes weakens the liveliness of the livery: a behavior similar to the fish that has health problems.
Some species can also change livery with the various moods.

Behavior Change

Although the common imagination attributes to fish a relatively simple and not very plastic cognitive system to changes in the environment, some recent researches instead document how, at the base of their behavior, there is a mechanism common to other terrestrial vertebrates [30].

It is known, for example, that some cognitive functions such as vigilance from a predator or observation of a conspecific are processed mainly by different portions of the teleost nervous system, in a similar way to what is observed in humans for other functions, where the areas cerebral language are mainly located on the left while the visuospatial abilities are located more in the right hemisphere.

Intelligence Edit

Fish seem to be able to solve even apparently very complex problems for the nervous system they have: a research published in Animal Cognition (Agrillo et al., 2007) documents for example how, at the basis of social choices towards groups of conspecifics of different numbers, there is the application of spontaneous numerical abilities similar to those observed also in other animals such as birds, rats and monkeys [31].

Basically it seems that fish have a rudimentary system of mathematical calculation that allows them to distinguish which of the two groups presented is the most numerous [32].

Special cohabitations Edit

There are many cases that see fish coexist with various potentially dangerous animal species (because they are predators) or with particular bacteria that make them bioluminescent. Often it is a question of mutualism, but there are also cases of parasitism, albeit imperfect.
Just to cite a few examples, this is the case of numerous species that hide among the tentacles of jellyfish and the famous clownfish (Amphiprioninae) that live among the stinging tentacles of sea anemones without being victims, thanks to a particular mucus secreted by the skin that does not activate the fearful nematocysts of the anemones.

Particularly interesting and studied is the behavior of a small group of such fish Labroides (Labridae), whose best known species is Labroides dimidiatus that, feeding on small crustaceans and worms that commonly parasitize many fish, are very welcome inhabitants of the coral reef, to the point that near their burrows they form real stopping points where many fish patiently wait to be "cleaned" , letting these blue-black fish graze even between the gills and the teeth. A meekness stimulated by a particular dance that the little cleaner performs to be recognized. Such an unusual trust could only be exploited: there is a small blennide (Aspidontus taeniatus) very similar in appearance to the wrasse but with a much greater voracity which, after having danced in a similar way to the cleaner, approaches the fish stopped at the cleaning station and bites it quickly, escaping with a piece of meat or gill [33] .

Even if it is not a question of true mutualism, the relationships that pilot fishes and hesitations establish with their "traveling companions" are well known and studied: these fish in fact exploit the protection of large predators (sharks, rays, manta rays, turtles and cetaceans) swimming near them or even adhering to them, eating the leftovers of their meals.

Aggregations and banks Edit

Some fish lead a solitary life, while others live together with other specimens of the same species. In this case, aggregations or banks can be formed.

An aggregation (or shoal) is formed when groups of fish come together in response to external stimuli, such as the presence of food or the attraction to a light source. In aggregation, each fish does not maintain a precise distance from another fish and the swimming speed varies from fish to fish. Quite different is the case of the bench formation (school), in which each fish is able to maintain a fixed distance from the other fish and the changes in swimming speed and direction are synchronized: the school moves as if it were a single organism. The relative position of each fish within the school is maintained through the view and the lateral line in particular, each fish does nothing but follow the fish closest to it, this is sufficient because, on the whole, the movement is orderly and make up a bench. There are about 10 000 species of fish capable of forming schools, at least in one stage of their life. The most common examples of fish that live in schools are sardines (Sardina pilchardus), anchovies (Engraulidae) and herring (Clupea harengus).

For prey, the school makes single individuals less identifiable and confuses predators by carrying out evasive movements, such as opening in a fan or fountain, and then closing behind the predator for predators, hunting in the school facilitates the search for food and allows surround the prey and condition their movements.

Some species form clusters or schools during reproductive periods, so that there is a greater likelihood that gametes released into the water can meet. [2]

Migrations Edit

Many fish species migrate for reproductive, food or growth purposes. Some species make small shifts, while others like tuna (Thunnus sp.) performs vast ocean movements.

One of the main reasons for fish to migrate is the dispersal of the larvae. These, once the eggs have hatched, are pushed by the currents towards sheltered areas, called nursery areas, where they receive nourishment and protection from predators. The fish then move to reproduce in areas where local currents are present which ensure that the larvae are transported to the right areas of nursery. Here the fry grow quickly and once they have reached the appropriate size they perform one counter-migration towards the open sea.

Some species are able to migrate from the sea to rivers and vice versa. Species that move to reproduce from rivers to the sea, such as eels, are called catadrome those that make the migration from the sea to the river, such as salmon, are called anadrome.

Bluefin tuna (Thunnus thynnus) make migrations across the Atlantic Ocean, managing to travel up to 9000 km in about 4 months.This species has two subpopulations, one which lives along the coasts of South and North America and which reproduces in the waters of Mexico, while the other lives along the Atlantic coasts ranging from Morocco to Norway and reproduces in the Mediterranean. Here the tuna enter through the Strait of Gibraltar, follow the main currents and reproduce. Once mating is complete, some tuna remain in the Mediterranean, while most of them return to the ocean. Small tuna grow quickly, reach sexual maturity at about 3 years, move within the Mediterranean and after about 7-8 years they too return to the ocean. [2]

Food Strategies Edit

Among the herbivores there are species filtering machines, which feed on phytoplankton that filter through the structures present in the gills, called branchiospine. THE scrapers they feed on epiphytic and encrusting algae, while i burners they feed directly on algae and phanerogams.

Carnivores use different hunting systems. THE planktophages they filter water with their gills to feed on zooplankton and other small organisms i stalking hunters they camouflage on the bottom and waited for the prey to approach them i hunters in pursuit they are strong swimmers and actively hunt their prey i hunters in appearance they hunt their prey by staying hidden inside ravines and other hiding places i bentophages they feed on species that live on and in the seabed i shredders they have teeth suitable for breaking the exoskeleton of crustaceans, corals and echinoderms. Some like archer fish (Toxotes jaculatrix) or the arowana (Osteoglossum bicirrhosum) hunt insects out of the water, the first taking aim and then throwing a jet of water at the victim to make her fall into the water, the other jumping out to catch prey.

The necrophages feed on dead or injured animals and search for their prey by relying on the reception of olfactory, chemical or pressure stimuli.

Omnivores do not have a well-defined diet and feed on everything edible, whether animal or vegetable.

Source for human nutrition Edit

Since the dawn of mankind, fish has been an important and above all very variable source of food. The presence of easily catchable fish was also one of the reasons why the first human settlements were born in the immediate vicinity of seas or streams.
In fact, fish is a food with high biological value proteins, whose fats are largely made up of polyunsaturated fats (including omega-3s) and are also a source of vitamins and mineral salts. [34] Over time, man has learned to make the most of fish products and in the last century fishing policies have developed aimed on the one hand to increase the quantity of the catch and on the other to preserve fish that are too young and respect the playing times. However, billions of human beings who depend on the sea contribute in a very high percentage to the impoverishment and risk of extinction of many species. In just 100 years the impoverishment of the seas and rivers has been very high, and only in the last few decades has it been possible to understand the importance of aquatic biodiversity, establishing fishing reserves, encouraging aquaculture and prohibiting the use of nets. train except for particular fish products. Even today it is the East and especially Japan that has to depend on marine species in almost all of the food diet, consumed mainly raw (sushi and sashimi). Visiting the largest fish market in the world, he Tsukiji in Tokyo, one realizes how man now exploits the waters beyond their means. In fact, in this market there are more than 10 000 edible species of fish and molluscs, which now come from all the fish-rich areas of the world, the most quoted fish is the Mediterranean tuna, sought after and esteemed by Japanese wholesalers for the quality of the meat. Sometimes there are products whose real food need is questioned by the Western world, such as shark fins, cetaceans (mammals, but still at risk of extinction) and puffer fish (fugu), which is moreover deadly if not treated in duty due to the presence of the neurotoxin tetradotoxin in some of its organs.

The fish is also raised by man through fish farming they are raised in a fenced water basin, as soon as the fish reaches the perfect size it is collected with a net, this practice produces 50% of the fish sold by man

Ecology and dangers Edit

State of conservation Modification

Throughout 2007, the Red list IUCN has 1 201 species of fish threatened with extinction, about 4% of all the species described. [35] Among these species are cod (Gadus morhua), [36] il Cyprinodon diabolis, [37] coelacanth (Latimeria chalumnae) [38] and the great white shark (Carcharodon carcharias). [39]

Because they live underwater, fish are much more difficult to study than terrestrial animals and plants, and information on fish populations is rather lacking. However, freshwater species appear to be more threatened as they often live in relatively small areas. An example is given by Cyprinodon diabolis, which lives in a single pool of only 20 m². [40]

Major threats Edit

The oversizing of modern fishing fleets caused by the lack of adequate planning policies and protection of the ecological sustainability of industrial fishing has caused a quantitative depletion of fish in all seas [41]. Modern intensive fishing has already caused in some cases the collapse of fish stocks, which consequently are unable to reproduce fast enough to replace stolen specimens. This creates acommercial extinction, which does not mean the extinction of the species but the fact that the stock fish are no longer able to support an economically advantageous fishing, moreover, under a certain level of scarcity due to the Allee Effect, the stocks may not recover anymore. [42]

Another threat to fish populations comes from water pollution. Over the last century, industrialization, the increase in population and consequently the increase of various types of discharges into the waters have created severe inconvenience among the fish that if at best they abandon the course or the body of water at worst they are killed quickly by poisonous or carcinogenic substances. This also entails the risk of poisoning the entire ecosystem and in some cases seeing the entire watercourse die by eutrophication.

Less common but terribly disastrous are oil spills at sea due to accidents to oil tankers or pipelines. The oil tends to cover the surface first and then the bottom, suffocating fish, birds and vegetables with a heavy and toxic black blanket. In the event of accidents like these, life resumes flourishing only after decades, often counting some absences between species and thus creating imbalances in food chains.

In many tropical countries, indiscriminate fishing for aquarists also takes place, mainly for species that do not reproduce in captivity or for which breeding is less convenient than capture. While the problem is less pronounced in freshwater, it is visible along coral reefs, as many local fishermen spray a cyanide solution to stun and catch fish. In addition to risking the life of the fish, coral polyps that are in the immediate vicinity are often killed.

The introduction of alien species also poses a danger to fish species. One of the best studied and most damaging cases is the introduction of the Nile perch into Lake Victoria in Africa (Lates niloticus). This predator was partly voluntarily inserted into the lake, to support the fishing of local populations. Some specimens, however, have escaped from the ponds where they were raised for study purposes. The perch has practically eliminated all the endemic and exclusive cichlid populations of Lake Victoria, causing damage both to the ecosystem and to human populations: after the introduction of the species, in fact, a decrease of about 80% of the catch was observed. . Furthermore, the perch eliminated the natural predators of a mollusk which is one of the intermediate hosts of the flatworms responsible for schistosomiasis, a deadly disease for humans if not treated in time. [43]

Among the natural dangers of fish can be counted many cases of parasites by crustaceans, molluscs and worms. The popular saying Healthy as a fish has very little truth: fish are subject to many diseases, as much as all other classes of animals and plants, however in nature it is difficult to observe seriously ill fish, as natural selection means that these are often eliminated by predators.

Fish in culture, art and religion Edit

Present in the human diet since prehistoric times, fish is represented in all the civilizations of the Mediterranean basin together with the other foods offered by nature. They appear, centuries later, also in the Egyptian tomb frescoes as in the Roman mosaics of the imperial age, food but also a symbol of fertility.

The advent of Christianity contributes to giving the fish a mystical meaning: Jesus looks for His disciples among the fishermen, he tells them "I will make you fishers of men"and performs the miracle of the loaves and fishes.

During the persecutions the first Christians came up with an acronym with the simplification of the Greek word Ἰχθύς- ichthys (fish): Ἰησοῦς Χριστός, Θεοῦ Υἱός, Σωτήρ- Iesous Christós Theou Yiós Sotèr, ICHTHYS precisely, that is Jesus Christ Son of God the Savior and they used this abbreviation or just the image of the fish to indicate the first places of worship or even the Christians themselves. [44]

During the following centuries the fish was depicted together with the disciples, but Flemish art included fish and other sea products in the splendid and detailed still lifes that characterized Nordic painters from the 15th century. In modern and contemporary art, fish is a sporadic subject.

Oriental art (especially Chinese and Japanese), so sensitive to the beauties of nature, in the last four centuries has produced tables and sculptures of refined workmanship in parallel with the "art" of selecting varieties of goldfish and koi carp from enchanting liveries, object of vanity among the nobles of the time.

10 weird fish

Believing that an animal is "strange" is the result of our perception of reality which follows aesthetic canons linked to our species and which considers certain characteristics absurd simply because they are unrelated to our daily life. If everyone, for example, had saber teeth, no one would find it absurd after a while, but on the contrary, it could happen that those who have longer and more well-kept "sabers" make more impact on potential partners, making this character a sign of favorite beauty, such as blue eyes considered particularly attractive in our society. However, it is very curious to rummage through the various animal forms and see which ones they have taken on more fascinating or "monstrous" features. Here are some examples of really weird fish:

Blob fish (Psychrolutes marcidus)

The blob fish has become, in spite of itself and unbeknownst to it, one of the best known fish for its appearance. He was in fact nominated by the Ugly Animal Preservation Society how the ugliest animal to the world in 2013, but in reality his fame is the result of a misunderstanding lasted years. In fact, this fish lives in the depths of the Pacific Ocean, off the Australian coast, at a depth ranging from 600 to 1200 meters where the pressure is very high. His limp and sad appearance it's not his real look, but it is due to the decompression caused by the escape of the fish from the depths in which it lives.

Sunfish (Grinding wheel)

The sunfish is a species that has awide distribution and is widespread in tropical and temperate waters around the world. His appearance it is really very particular: it is flattened laterally and is as tall as it is long, giving the idea of ​​being only one boat head without body. The name is mainly due to its lunar shape, i.e. rounded, and in English it is also commonly called sunfish for the habit of come to the surface to sunbathe thus favoring thermoregulation. Often also his dorsal fin protruding out of the water is confused with that of a shark. If you are lucky you can spot this fascinating fish basking blissfully on its side on the surface of the sea, behavior that seems to also serve for get rid of parasites, which are eaten by some seabirds.

King of herring (Regalecus glesne)

in the picture: Reconstruction of Regalecus glesne

The king of herring is the bony fish longer in the world, generally three meters long but can even reach seventeen meters, and is often mistaken for a sea snake due to its shape. The nickname "king of herring" it is probably due to the belief that he drove shoals of herring like a king, as he was often found in their vicinity. It is a species that lives off the oceans around the world, of which little is known yet, but it was filmed swimming in a bizarre way in upright position and with the tail down.

Stonefish (Synanceia verrucosa)

Stonefish is the species of fish more poisonous to the world that lives on the bottom of the Indo-Western Pacific Ocean. Thanks to ability to blend in among the rocks it generally hides in the coral reef and then attacks the prey. From this skill of camouflage, which makes it indistinguishable from the rocks of the seabed, derives its name, also used to describe the whole family of Synaceides of which it is part. It is a carnivorous species whose venom, secreted by thorns covering the body of the animal, can be fatal to the elderly and children in high doses.

Black devil (Melanocetus johnsonii)

The black devil is a fish belonging to the order of the gods lofiformes, a group of abyssal fish from the most varied aspects and characterized by a very particular way of preying. These in fact generally have a long strand which ends in some species with a luminescent organ which, shedding light in the abyssal darkness, attracts prey by acting as a bait and sometimes also used for mating. The luminescence is due to some bacteria that live in and around the bait and are able to produce light. Lofiformes are also known for another reason: in many species the female is much larger than male and the latter is reduced to a small parasite, almost useless were it not for reproduction. The black devil lives between 100 and 1,500 meters and the bioluminescence of its bait is due to the symbiotic bacterium E. escacola.

Common sawfish (Pristis pristis)

Sawfish live in all tropical and subtropical waters and have also been found in some rivers. The peculiarity is the presence of a saw-shaped rostrum, equipped with small teeth which is mainly used for predation. In fact, the fish performs undulatory movements with the saw to stun the schools of fish which it then feeds on.

Macropinna microstoma

It is a species that lives in the Pacific Ocean between 600 and 800 meters deep and is a truly unique fish. Have you ever said to someone: "Do you have something in your brain?". Here, this fish could really show you. In fact, its peculiarity is the transparent head, which seems to be made of glass, and where you can even see the inside. Furthermore the green structures present inside the skull are the eyes of the fish which have a tubular shape and have the ability to move in all directions to spot prey.

Arabian triggerfish (Rhinecanthus assasi)

It is a species that lives in the Western Indian Ocean and at low depths. It is also referred to as fish Picasso for the beautiful colors that characterize it so much that it looks like a painting. Like all triggerfish it is characterized by a "snap" dorsal fin , also called trigger, formed by three thorny rays and which can be raised and lowered at will in order to protect yourself from predators.

Yellow boxfish (Ostracion cubicus)

The boxfish has a wide distribution and lives mostly among the coral reefs of the Pacific and Indian Oceans, but has also been found in the southeastern Atlantic Ocean. The name comes from the rigid internal carapace which protects it and gives this fish the appearance of a real box. The very bright color is a warning for predators, as if saying: "Beware that I am dangerous!". In fact, if subjected to particular stress, and being preyed upon is not really a pleasant event, secretes a neurotoxin on the skin, tetrodotoxin, which can be fatal to other fish.

Psychedelic Frogfish (Histiophryne psychedelica)

It is a species that lives in Indonesian waters and features a truly fascinating coloring. The design that covers the body of the animal, which resembles some species of corals, is different for each individual, thus representing a sort of Fingerprint which allows easy recognition for researchers who want to study this species. Another peculiarity is that instead of swimming it prefers to walk on the seabed using the pectoral fins as terrestrial limbs.

Physical characteristics fish

Fish: what they are and their characteristics - ScuolaDeli

Fish represent the largest group of vertebrates: in fact, almost half of the existing vertebrates are fish. There are about 25,000 species of them. Vertebrates are the animals that have spines. Characteristics The fish can swim thanks to the fins, which are formed by folds of the skin supported by small sticks, called rays. I [PHYSICAL CHARACTERISTICS. The fish as vertebrates have a skeleton (endoskeleton) formed by a skull, a vertebral column, ribs and bony structures that serve to support the fins. Breathing occurs through. The goldfish is one of the best known and most common fish in the world, as it is on the head. Pearlscore, like Oranda, originated in China. The characteristics of this fish are the shape of its body, commonly called egg-shape, and the shape of the scales, which are similar to pearls (hence the name of Pearlscore). Furthermore,. Characteristics of Pisces: personality, strengths and weaknesses Pisces are euphoric and clumsy when it comes to intense emotions. Yet they are inspired, sensitive, physical, receptive and creative people. They aspire to the fusion of body and soul and in everyday life they are animated by a desire that makes them generous to the point of unbelievable.

Pisces - Who are fish and how do they live - HELICHRIS

  • The physique is strong, lean and agile, and the height is above average. People with this ascendant can have birthmarks and scars on their heads, and be prone to accidents and head injuries. Ascendant in Taurus. Dark, long, wavy eyes and hair are a hallmark of the Taurus ascendant
  • Physical characteristics . Unlike most fish, they have no scales. They usually have an adipose fin (fleshy, rayless rear fin) and thorn-like rays. The dorsal fin usually has two spines, first of which very short. It may have as well as no bones
  • General Characteristics Osteichthyes or bony fishes are the most widespread current aquatic Vertebrates, they have a skeleton mostly ossified and a body covered with bone scales of dermal origin.
  • THE LIGHTS OF THE FISH. Before continuing with the description of the characteristics of Pisces, I must remind you that when I speak of a sign I refer to the values ​​and the type of energy that the sign carries and I do not intend to describe all the strengths and weaknesses that the person born under that sign solar necessarily will have
  • Frogs, toads, salamanders and newts are part of the amphibian group. Amphibians are vertebrate animals because they possess the spinal column. Frogs, toads, salamanders and newts are part of the amphibian group. Amphibians are vertebrate animals because they possess the spine, such as fish, reptiles, birds and mammals
  • Physical characteristics of Oceania 4,000 species of fish and 50 types of marine mammals. The main mammals are the dingoes, the numbats, the Tasmanian devil and the Quolls.
  • Pisces: It can't work, too much apprehension and few decisions. The ascendant of the sign of Pisces To know exactly the astrological characteristics of a person, in addition to the zodiac sign, it is also good to know the ascendant

Goldfish - Aquarium fish - Characteristics of red fish

  1. Birds are vertebrate animals, that is, they possess a spinal column like fish, amphibians, reptiles and mammals. They managed to break away from the ground and conquer the air. Thanks to the flight, birds are spread everywhere. The flight allows you to quickly search for new territories to build the nest, get away from danger, look for the [
  2. If you were born between February 21st and March 19th you belong to the sign of Pisces. Last sign of the zodiac, disputed by a heavy past and an uncertain future, Pisces has the privilege of closing the.
  3. Fishes. They are often defined as dreamy and romantic women, people of enchanted beauty. In pure Eva Longoria style (March 15), a woman capable of radiating a soft energy.

Pisces is the twelfth sign of the zodiac, and it is also the last sign of the zodiac cycle. This sign, therefore, carries with it many of the characteristics of the eleven signs that preceded it. Pisces, however, are happier in keeping many of these top secret qualities Puffer fish: characteristics. The puffer fish is so called because when it senses the presence of a potential danger it swells and takes the shape of a ball, in fact. In addition to becoming spherical, it is also ready to poison the enemy, an enemy that can also be man since his poison also affects us .. This animal belongs to the Tetraodontite family. The sign of Pisces is a water sign, mobile, feminine and its planet is Neptune (and Jupiter). What are the physical characteristics of the sign of Pisces? The Pisces type is physically one of the finest and most fragile of the astrological types. Individuals of small stature are often observed, rarely really thin, indeed with rather shapes. The composition of the meat of molluscs and crustaceans has some peculiar characteristics. The protein content (13-18%) is slightly lower than other fish. Carbohydrates are quite abundant, up to 6-10%: for this reason crustaceans have such a sweet taste

Characteristics of Pisces: personality, strengths and weaknesses

The Trout: Physical Characteristics The trout includes freshwater and anadromous fish, which, originating in the Northern Hemisphere, are now widely distributed. Depending on the environment they live in, they take on different colors and patterns. Basic characteristics: What is the sign of Pisces like? The sign of Pisces is a water and changing sign dominated by Jupiter and Neptune. Generally it is not a very optimistic and confident sign in life even if Jupiter should instill these qualities but it is rather Neptune that makes itself felt making it a dreamer, very sensitive, tender and sweet FEATURES OF THE PISCES SIGN. Today's horoscope. Jupiter and Neptune are the dominant planets, the element is water, the quality is changeable. The Sun transits into Pisces approximately from February 20 to March 19. Color to wear: sea green or turquoise. Birthstone: aquamarine

ASCENDANT IN PISCES Physical appearance (of the pure type) People influenced by Pisces usually have a small, fleshy and soft body, have an uncertain gait that makes them resemble the natives of Cancer, although they are more corpulent. The feet have the toes turned inwards, as in the case of the Virgo subjects, but they are larger Water quality: In the breeding of any aquatic organism, the quality and chemical-physical characteristics of the water used are of great importance. . Initially it is important to recreate the conditions that are closest to the needs of the flora and fauna that are intended to be introduced into the aquarium.

Purchase and storage of salmon. There are, at the time of purchase, some simple steps to ensure that the salmon is fresh. If we buy it whole, we check that the eye is convex and alive, that the flesh is very firm, that the color of the gills is pink and that the scales are bright if we buy it in slices, make sure that the bone adheres well to the. The territory of Sicily also includes several islands and archipelagos, such as the archipelago of the seven Aeolian islands and Ustica to the north, and that of the three Egadi Islands to the west as well as, to the south, Pantelleria, and the Pelagie Islands. , like the islands of the Stagnone .. The Pelagie islands are geographically linked to the African continent (in particular Lampedusa and Lampione), but. Pisces horoscope, characteristics of the zodiac sign of Pisces and its emotional psychological profile. A unique analysis of the sign of the fish Physical characteristics The original appearance of the wild goldfish is that typical of carp, with a very inconspicuous olive green color. The first color variation, which appeared by chance, was the yellow-orange one, later many other colors appeared (white, black, red, brown) also variously combined with each other characteristics fish, origins, descriptions, anatomy. on the term fish means all cold-blooded vertebrates (Heterotherms) that lead an aquatic life, which breathe essentially through gills and are normally equipped with fins

Physical Appearance Based on Ascendant - Secret Astrolog

Pisces also seems to have an obvious attraction for multiple relationships, group love is the best for natives of this sign. The truth is that he gets excited by the pleasure of others. The rest matters little. It does not matter the sex, age or physical characteristics of the pleasure partners. Physical characteristics. Past naturalists believed that paddlefish used their snouts to pull vegetables from the bottoms of lakes and rivers. In reality, these fish feed by filtering zooplankton from the water thanks to a series of filaments on the gill arches called branchiospines. Anatomy of the starfish. This animal, like other echinoderms, moves in a very curious way. His arms behave as if they were the spokes of a wheel. At the end of each, they have a simple eye to perceive light and dark, as well as to identify moving objects. The body wall is covered with granules, tubers or thorns. some fish that in fact have specific peculiarities. So let's try to do some clarity. Physical characteristics of blue fish. It is named after the typical blue color, also tending to green, which extends on the lateral and dorsal scales. How to Recognize the Diseases of Aquarius Fish. As you pass the aquarium, you may notice that the fish behave strangely or exhibit unusual physical characteristics. These are signs that they are affected.

Catfish: definition, physical characteristics, dimension

  1. ile. People born under the sign of Pisces tend to be short to medium in height, with short limbs. They are likely to be burly (and this sometimes results in obesity) as older people
  2. a very fast deterioration of the product. The reasons for this greater perishability are to be found in two fundamental causes: one
  3. Classification and structure of fish. Differentiation based on: environment, physical characteristics, skeletal tissue and EC regulation

Today I teach you to recognize people with physical features! Did you know that we physically reflect, not the zodiac sign, but the ascendant when we look a person in the face we do not look at the zodiac sign, which governs the id, but the ascendant which governs the self to express myself better, I think: zodiac sign I express : ascending! and here the troubles begin. The characteristics of the Pisces ascendant on the 12 zodiac signs. How the sign of Pisces affects the personality Having said that, and before going to see in detail some of their main characteristics, here is a general overview of the sign: ruled by Jupiter and Neptune, it is the last sign of the Zodiac and, as such, prepares for a new cycle of the Sun. Pisces are considered the feminine sign par excellence - although their family includes many men of. Physical characteristics: The body of the sea bream is long and oval and has a gray and bluish color. The average size of a sea bream is about 70 centimeters, although the most common size among farmed sea bream is 50 cm for a total weight of 10 kilograms. Redfish fish. Rated 5.00 out of 5

I Pesci osseo Natural and Physical Sciences Museum Center

  1. Sorry girls, I can't find the physical characteristics of the zodiac signs. The question arises because I am somehow convinced that, for a woman, the Sun represents the character characteristics of the ideal man, while Mars represents the physical ones.
  2. Choose the easiest freshwater aquarium fish to keep, suitable for both beginners and experienced aquarists. It is rather tolerant as regards the chemical-physical characteristics of water, but prefers a basic PH (around 7.5).
  3. In the case of tropical fish, nature gives us clear indications of their eating habits through their physical characteristics. Most bottom-swimming fish, such as catfish, have a downward-facing mouth as they feed on the bottom and prefer tablet feed, which sinks quickly.
  4. Scorpio is a tenacious and aggressive sign. It includes those born between October 23 and November 22. It is a water sign, discover its characteristics! From 23 October to 22 November. Scorpio is a Water sign like Pisces and Cancer, it is a mysterious and impulsive sign that it prefers.
  5. Puffer fish: appearance. The puffer fish belongs to the Tetraodontite family, a word of Greek origin that means four teeth. This is because the fish has four very sharp and thin front teeth that allow it to open mussels and clams for its own nourishment. but all are united by the peculiar shape of the oval body and by the.

. February 12, 2019. Since the body is not everything, Another element that does not concern the physical and that is important in any relationship, not just sentimental, is the ability to share good times, laughter and joy Pisces: species, characteristics, curiosities . Fish represent a very large, heterogeneous and numerous group of marine animals that collects invertebrate organisms of aquatic nature. All fish have three precise characteristics in common: scales, fins and gills. The simplest physical characteristic to observe, but not very reliable, concerns the size of goldfish: usually, the male is smaller than the female. The female goldfish has a fuller and more rounded body than the male, usually more slender and tapered

The characteristics of Pisces - STARS AND PSICH

  1. Physical characteristics fish. The sign of Pisces is a sign characterized by strong empathy and altruism, with Cancer and Scoprione it is part of the water signs. Discover its characteristics Characteristics Fish can swim thanks to the fins, which are formed by folds of the skin supported by small sticks, called rays. THE
  2. Hygiene and prophylaxis of the main diseases of fish, molluscs and crustaceans. Chemical-physical characteristics of aquaculture products and WWF Italy - News: it has lost its chromatic identity, as well as its organoleptic characteristics, odors. We should learn to talk about fish as living entities
  3. For example, you have to look at some physical characteristics of the fish you are going to buy, because they will give you clues about their health. Some betta fish diseases or negative signs can be
  4. izations are found in Liguria since 1600. The surname Pesci is more typical of the central north

Fortunately today, much more is known about this cute animal about its biology and its behavior .. Platypus where it lives. The natural habitat of the platypus are mainly rivers and lakes, especially in Tasmania and Eastern Australia. What platypus eats. The platypus hunts underwater by scouring the bottom of rivers and feeds mainly on. Choose under your sun sign of birth and read the main characteristics both character and physical. In addition to this you can also read what are the strengths and weaknesses of the 12 zodiac signs and therefore also of yours Physical characteristics: These thin fish have a bright blue upper stripe and a vibrant red lower stripe. 04 of 10Panda Cory Cat (Corydoras panda) Prudtinai / Getty Images. These bottom-fed fish, commonly referred to as Corydora, are peaceful fish that like to live in a Pisces group. It is the last sign of the Zodiac. It is ruled by Jupiter and Neptune It is a Feminine sign. Its element is Water, its quality is Mutable. Its color is green, the lucky stone is amethyst and the lucky day is Thursday. The astrological symbol of Pisces is represented by the tails of two Pisces tied with a string He betrays sometimes, if he is very physically attracted to another woman, but it all lasts only one night. He is not the type to create ambiguous or parallel situations. How to conquer a Cancer man. According to the stars there is a great affinity with the Pisces woman, tender and dreamy as he is, or the Scorpio woman who will be able to awaken his.

Habitat: it has euryhaline characteristics and therefore lives both in salty, fresh or brackish waters. Physical characteristics: it has a serpentine body, the scales are hidden in the very sturdy skin covered with mucous secretion. The back has an olive color while the belly is whitish. The length turns out to be about one meter for males and about one and a half meters for females In psychological astrology all the zodiac signs have specific characteristics: discover lights, shadows, distinctive features and less known details of each of the 12 signs of the zodiac in the horoscop. The blue fish: It is a fish variety with certain physical characteristics (blue colored scales on the back General and morphology: The clown fish lives mainly in the coral reefs of the eastern Indian Ocean, the Chinese Sea and the western Pacific Ocean, going as far as to the Solomon Islands and Vanuatu. Its name owes it to the extremely colored liveries, which are usually red-orange and streaked with white or black. Its body is laterally compressed, with large. All the fish of the genus Hippocampus have the same physical characteristics and are distinguished from the rest of the fish. They do not swim backwards and the physical structure is centered on a vertical rather than a horizontal axis, so the seahorses have an upright position, although when swimming they assume a more hydrodynamic, forward position.

The physical characteristics of river fish allow them to live in low-salt waters. Among the fish that live in rivers (whose waters have more phosphorus, potassium and magnesium) we find a great variability in the diet. The species that filter water, feed on debris from the soil of rivers or lakes and they live and feed in the seabed, as they have a. Physical characteristics . Red mantle, white belly, The animal world defines specimens that are sometimes even unknown, whether they are fish, dogs, cats, birds, horses, each with different characteristics and care, it is up to us to give them the look they deserve Venus With Venus in Pisces we tend to live your feelings in a sweet and romantic way. Love develops in a timid way and to strengthen itself it needs to dream and be dreamed. In the sign of Pisces, Venus is exalted, that is, it can express itself to the maximum. Those who have Venus in Pisces in their birth chart tend to be naive in love.In Pisces, Venus has a great influence and induces the.

Lionfish - Pterois-volitans. The scorpion fish is a solitary animal and only joins other fish during the reproductive period. When the flying scorpion fish is ready to reproduce the physical differences between the two sexes become more evident. The males in this phase usually become darker, with the much less noticeable stripes. Females become lighter, with the belly. These fish commonly called pacù, feed on plants, not only on fruits but also on leaves and stems. If you want to read similar articles to Frugivorous Animals - Characteristics and Examples, we recommend you visit our Facts about the animal world category Three new species of snail fish have been discovered in the depths of the Atacama Trench, extraordinary abyssal animals with unique physical and behavioral characteristics Characteristic Virgo Sign Virgo from August 24 to September 23 Virgo is the sixth Sign of the Zodiac , to be precise, and this is the way Virgos like it: to be specific


Characteristics of fighting fish. Share on Facebook. The fighting fish, however, this aggression typically does not cause physical harm to all fish. Keep 4-6 females in a tank, so that no fish know too much targeted by the established hierarchical order.The most extraordinary and particular characteristic of these animals is undoubtedly their mouth: in fact it is not equipped with teeth like the sperm whale, but of baleen. These are sheets of keratin, the same substance our nails are made of, whose shape resembles the bristles of the toothbrush that has seen the appearance and extinction of different groups of fish until the affirmation of the current group dominant of the bony fish, the Teleostei. The first fish, and therefore the first vertebrates, known as Ostracoderms, appeared and diversified, especially in freshwater, between the Cambrian (510 million years ago) and the Devonian (350 million years ago)

Thanks to the natolie and the dorsal fin, the dolphin is able both to remain in balance and not to lose the course, while the tail gives it a great help to introduce the body into the water during the dive, this is possible thanks to the fact that the specific anatomical characteristics of the cetacean tail, unlike the fish tails, have allowed it to evolve. According to the zodiac, each person has its own precise characteristics determined by the sign of belonging, the period in which it is crossed by the Sun and the planet from which it is governed.Each zodiac sign, therefore, according to Astrology has a well-defined characteristic and a precise origin which binds it to mythology. We therefore find zodiac signs that denote a more open character.

The characteristics of the zodical signs: the dates, the character understood as strengths and weaknesses, the affinities of each sign, the strengths, the stones and the planets Taurus is an Earth sign, while Pisces a water sign. Being tangible physical entities, the two elements are extremely compatible with each other. The Taurus can help the partner keep his emotionality in check, while the Pisces can add a touch of mystery to the practical and quick ways of the Taurus. Also called hammerhead, the hammerhead shark is one of the best known and most characteristic fish in the world and lives in the surface waters of tropical seas during the summer, however, it migrates in huge schools to the temperate seas, even reaching the Canadian island of Newfoundland, Great Britain and the Mediterranean Sea

Short Haired Dachshund Dachshund: characteristics The dachshund is one of the dogs with the most history behind many other breeds currently on the market. In fact, it can be said that this small animal has managed to populate several centuries of history, even accompanying the pharaonic guards during the Middle Kingdom in 2100-1700 BC. about Physical characteristics. This type of fish, especially for less experienced eyes, For sport fishermen, it is possible that these fish will bite using the trolling technique, although it is necessary to be adequately equipped because the specimens are large and very strong.

Physical Appearance and Zodiac Signs. These are the points to investigate the physical aspect: 1) According to the astrological Tradition the Ascendant establishes the aspect, being the sign that was in the East at the time of birth, fundamental for the purposes of physical imprinting In Pisces: the physical is one of the finest and most fragile (neptune in domicile) with a tendentially small stature (moon in exaltation) rarely tendentially thin (jupiter in domicile) I place here the physical characteristics based on the ascendant In Aries:. The Pisces subject is usually not very inclined to play sports, the Pisces subject can be passionate about physical activities related to dancing, but water sports are also suitable, considering that water is his element. Among the favorite sports we find: break dance, Caribbean dancing, swimming. The sign Pisces in love The 12th and last sign of the zodiac. However, if we observe their function, i fishes they are by no means to be considered as such. They are the sign that allows us to give an account of what our life has been and to evaluate the lived experience. Then, with the sign of Aries, a new cycle begins again

The Pegasus-Pisces B supercluster (SCl 213) is a supercluster of galaxies located in the constellations of Pegasus and Pisces at a distance of 188 million parsecs from the Earth (about 613 million light years). It is considered the extension of the nearby supercluster of Pegasus-Pisces (SCl 003) which has its center 1.334 million light years from the Earth. Sometimes the two superclusters come. Fishes A grouping considered invalid in modern systematics, including Gnathostomal, aquatic, marine and freshwater, heterothermic, amphirrine Vertebrates, with over 30,000 living species. The term p. it is also used by extension to indicate Agnati (lampreys and hagfish). zoology. 1. Classification. All current P. are included in the group of Gnathostomes, that is. The eel (Anguilla anguilla) is a bizarre fish, with truly unique characteristics, which manages to combine physical snake traits and amphibian abilities.Some of its behaviors are still a mystery to science and, in particular, little is known about it. its reproduction, as well as the journey of thousands of kilometers undertaken by the adult specimens to complete it

Oceania, with physical, territorial, flora and faun description

Physical characteristics The dogfish is a fish with a slender and tapered body, with a length that can vary from 40 to 150 cm but which, in the common dogfish species, can reach 2 meters and easily exceed them Characteristics of children born under the sign of Pisces. Fish are idealists, dreamers and very timid in the continuous search for an emotional and working stability that can balance their precarious emotional state. In addition to living in distinct habitats, they possess very marked physical characteristics and physiological peculiarities. Ours is a country with a great wealth of water and it will be interesting to analyze the situation of river fish in Italy today. Main differences between river and sea fish

PISCES Character, affinity, strengths and weaknesses of the sign of

Sagittarius man: characteristics and secrets of the zodiac sign. In love and in life, Sagittarius is really restless and unpredictable. It does not have much affinity with the Virgo woman, too fearful and homely and with that of Pisces, too sticky for her independent tastes.The term fish identifies a group of finned and aquatic animals, vertebrates, able to breathe underwater by means of gills. Due to the prominent role in human nutrition, the various fish species have been grouped into the more generic food category of fishery products (which also includes molluscs and crustaceans) PHYSICAL APPEARANCE AND WEAKNESSES: this ascendant is not too generous and often dispenses a difficult physical aspect: too thin or too robust, with evident disharmonies, small, dark, penetrating eyes that you use as weapons to attack with unsustainable glances even for the most self-confident, robust hair, but rebellious, usually curly and a little bristly, oily, tending skin. Physical characteristics Regardless of the species, the body of the shrimp is divided into three parts: head, thorax and abdomen. The edible part, enclosed by a hard protective membrane called the carapace, includes the chest and abdomen area

Birds: what they are and their characteristics - ScuolaDeli

Among the fish that are often chosen by aquarists only for their strange and extravagant appearance, different from common aquarium fish, there are the so-called knife fish. Under this name are grouped fish with very different characteristics and needs, and which are often not suitable for common community aquariums, understood in the common sense of the term, but all. Scorpio Oct 23 - Nov 22 Here is another first woman of the Zodiac. Narcissist, proud, melodramatic in all its manifestations, she expresses her whimsical and irrepressible nature in every life situation. However, she has a shrewd and inquisitive intelligence that allows her to never fully discover her cards and never let herself be seized by unprepared by events or by. The chemical-physical qualities of water. As for the chemical-physical qualities of the water, it is very important to keep the correct parameters as stable as possible: these fish are very delicate and sensitive to any variation, even the slightest one in the environment.

Pisces: all the characteristics of the zodiac sign of Pisces

Assessment of the physical / chemical quality of feed for aquaculture by sampling in the farm Results and operational indications The analysis of the diets allowed to have a first representation of the physical and nutritional characteristics of the feeds that are used in aquaculture at national level PHYSICAL CHARACTERISTICS All amphibians have in common the bare skin, ie devoid of hair, feathers, scales or other protections that we find in other vertebrates (mammals, birds, reptiles and fish). The skin is always kept moist by a veil of mucus: this reduces the loss of water from the tissues. FISH: Linked to the water element, it is a mobile sign dominated by the planet Jupiter and Neptune. Motto: I TRANSCEND. In the zodiac sign of Pisces, the protective mantle of winter (snow, ice, etc.) begins to slowly melt, and gradually life returns to flow throughout all creation and all its creatures, reinvigorating everything FEATURES OF THE FISH TYPE Water sign , mobile, feminine, domicile of Neptune (and Jupiter) The Pisces type is physically one of the finest and most fragile of the astrological types.

THE CHARACTERISTICS OF CANCER. Cancer tends to be introverted and does not appreciate very much the novelties that alter their emotional balance: they prefer to move in known and stable contexts. Or rather, he does not disdain change, but with an essential condition: he must be the one to guide it Astrology Horoscope Zodiac sign Capricorn Ascendant Aries Taurus Gemini Cancer Leo Virgo Libra Scorpio Sagittarius Capricorn Aquarius Pisces of the day, of today, tomorrow, of the week Positive negative characteristics Character Personality Physical characteristics of the zodiac signs PISCES As in the fish world, the types of fish can be very different, therefore we have large, small, thin, fat Pisces often influenced by nearby signs as always. The Pisces woman is always charming.

In the deepest waters of the Earth, not even light reaches. Yet there are creatures capable of surviving even in these extreme conditions.


Life in the abyss is still in good part to discover, although man has explored these inaccessible places with underwater robots and aboard submarines, going as far as -10.916 meters, at the deepest point on the planet: the Challenger deep, in The Mariannes Trench. Here, the pressure is comparable to that exerted by two elephants hovering on a big toe!

By scanning these mysterious places with cameras, however, the researchers found that the fish disappear suddenly about 7,500 meters deep. Why? The quota limit would be imposed by the Tmao molecule (N-oxide-trimethylamine): in addition to giving the fish their characteristic odor, it stabilizes the proteins and prevents the enormous pressure of the water from "distorting" them, making them unusable. Under that depth, however, the TMAO doesn't work either.

So let's find out what these creatures are, these "animals of the abyss", who live in such a particular environment.


Let's start immediately with a bang, since until recently it was thought that this animal did not exist. The Giant Squid (kind Architeuthis), in fact, for centuries it was considered only a mythological creature, which animated the tales of sailors. It was understood that a huge creature really inhabited our abysses only when some dead specimens were found on the surface but even more exciting see one live, in 2012, when a television crew managed to film it for the first time in its natural habitat.

It is estimated that the female, larger than the male, can reach 13 meters in length, including tentacles, and that this animal loves cold waters between 500 and 1,000 meters. But there are those who have gone further. The vampire squid (Vampyroteuthis infernalis), in fact, it manages to live without problems up to 3,000 meters deep, orienting itself in the dark thanks to eyes proportionately larger than any other animal on the planet.

Among the marine mammals, the zifio (Ziphius cavirostris) is certainly the one most at ease in the abyssal depths, where it goes in search of squid, its favorite prey. In 2014, scientists monitored the dives of a specimen off the coast of California (USA) with a satellite device, discovering that the animal had gone as far as -2,992 meters, with a freediving record two hours and 18 minutes: the longest and deepest dive ever documented for a mammal.

Its presence at the bottom of the sea is also testified by the scars on the hips and on the back, caused both by other males and by the bites of the cutter shark (Isistius brasiliensis), present up to 3,700 meters deep.


The viper fish (Chauliodus sloani), one of the most ferocious predators of the abyss, during the day it moves between 500 and 3,000 meters of depth, while at night it swims close to the surface in search of food. It is a fish that can measure up to 60 centimeters, loves the cold waters of all oceans and has become famous for its curious way of attract prey, crustaceans and other fish.

Inside the mouth, which the animal can open wide thanks to the disjointed jaw, there are about 350 small luminous organs, an irresistible attraction for those who live in the dark abyssal depths. The unsuspecting victims approach the luminous bait and, when they are one step away, the predator leaps forward and cages the prey in its jaws and then swallows it whole.


Monkfish belonging to the family of Anoplogastridae have been found up to a depth of 5,000 meters. They have an unmistakable silhouette, with a huge head from which one emerges disproportionate mouth, perfect for catching prey even much larger than their 18 centimeters. On the jaw there are two teeth so long that monkfish have developed dimples on both sides of the brain, in the opposite position, to accommodate them when the mouth closes, although the animal is never able to close it completely.

Probably, among the marine fish these teeth hold the record of magnitude in proportion to the size of the body.


Exist sea ​​urchins which live almost 7,000 meters deep. They belong to the genus Pourtalesia and own an extremely thin and delicate skeleton, so much so that it looks like a tissue paper. To feed in the hostile environment in which they live, they dig into the seabed and swallow the mud, filtering the microorganisms it contains. Their presence in the abyss is evidenced by the discovery of skeleton fragments collected more than 6,850 meters deep in the Java trench.


Mouse fish, belonging to the family of Macrouridae, account for about 15% of the abyssal fish population. They live at depths between 200 and 6,000 meters and the more they get older the deeper they are able to go deeper, hand in hand with gas-filled swim bladders, in fact, they are connected to muscles never seen before, which produce sounds with the release of gas. Furthermore, some species are also capable of increasing the concentration of the Tmao molecule in cells.

Finding a mate in the dark is not easy but these fish have come up with a unique strategy to get noticed: emit "underwater stinks". Their gas-filled swim bladders, in fact, are connected to muscles never seen before, which produce sounds with the release of gas. Furthermore, some species are also capable of emitting light pulses.


Octopuses of the genus Grimpoteuthis they live in very deep water and are endowed with two large protuberances on the sides of the head that have earned them the nickname of "Octopus Dumbo", due to its resemblance to the Disney baby elephant. However, it is not about ears but about fins that the animal uses to swim.

So far, 18 species of Dumbo octopus have been discovered, living in the Pacific Ocean at depths ranging from 400 to 7,000 meters. A specimen of Grimpoteuthis bathynectes was filmed with a video camera off the coast of Oregon, in the United States, at a depth of over 2,000 meters.


The undisputed record of living fish found deeper belongs to the snail fish, so named for the gelatinous appearance: it was 2008 and, during a scientific expedition, a specimen of Pseudoliparis amblystomopsis it was filmed at –7,300 meters.

Another research focused on the species Notoliparis kermadecensis, an animal with skin so transparent it leaves glimpse the internal organs. In the 5 specimens captured at –7,000 meters in New Zealand, the researchers found that the concentration of the Tmao molecule increased proportionally with the depth of the fish. According to this study, the theoretical limit assumed diving for fish would be around –8,200 meters.


In the Mariana trench, several types of amphipods, shrimp-like crustaceans that usually barely reach the size of a thumb. There, however, they were even 17 cm long. What food they found to be able to become so large was a mystery until, analyzing some specimens of Hirondella gigas taken from more than 10,000 m deep, it was found that they survive eating wood which occasionally precipitates from the surface.


The record for the holothurias, commonly called "sea cucumbers", is set at 10,687 meters below sea level. This is certified by the filming made in 2012 by James Cameron, the director of Titanic is Avatar, during his exploration of the Mariana Trench.

These invertebrates specialize in filter the seabed in search of nourishment: they orient themselves in such a way as to intercept currents, retain food with the tentacles present in the mouth and, finally, expel useless substances from the anus.

Animal fish

Fish belong to the large class of vertebrates and are heterothermic animals, in other words cold-blooded animals that is to say that the body temperature is regulated by the external temperature. They alone make up more than half of all the rest of the vertebrates put together (mammals, birds, reptiles and amphibians) Most fish are dioecious (possessing both sexes), and oviparous (with external fertilization and external development), as they release their eggs into the environment, bury them, or even carry them in their mouths, sometimes even behaving as if they are monitoring the eggs Fish Grouping considered invalid in modern systematics, including Gnathostomal, aquatic, marine and freshwater, heterothermic Vertebrates , amphirrids, with over 30,000 living species. The term p. it is also used by extension to indicate Agnati (lampreys and hagfish)

Pisces - Who are fish and how do they live - HELICHRIS

At the same time, again through the gills, the fish expels carbon dioxide. Most fish are carnivorous and prey are invertebrate animals, small or large, and insect larvae. Some, like sharks, eat other smaller fish and even seals! Some fish have long, sharp teeth

Animals 15 fish (plus one!) With unexpected talents. 16 PHOTOS Browse the gallery. They climb trees, make sand, sing love songs and unleash unexpected weapons: the amazing gifts of these aquatic creatures. Look at the gallery. 21 August 2014. Today Animal House Milano, the main fish shop remaining in Milan, offers a vast assortment of freshwater fish that can be reproduced in captivity to protect the sale of tropical fish and reef corals that are decreasing more and more due to the global warming and the destruction resulting from fishing, both destructive factors by man The fish is a symbol of fertility, of abundance for the large number of eggs it produces, of sexuality, coldness, indifference and stupidity. This species is placed at the foot of the world tree, and is opposed to birds

. This means that if the temperature of the water changes (during the day or during the year), so does that of their body. Aquaculture is an important animal husbandry activity. In recent decades, the farming of fish and other aquatic species has spread and policy makers, scientists and consumers are increasingly interested in the farming practices used and related welfare issues. Scientific methods for assessing the well-being of. Blobfish, also known as Psychrolutes marcidus, is a gelatinous, muscled-looking deep-sea fish with soft bones. It lives at a depth of about 4000 meters and boasts the ugliest fish award in the world which was given to it by the Ugly Animal Preservation Society. Measuring about 30 centimeters in length The pacu fish isn't the only underwater animal with a good set of teeth. There is at least one other species like them: the Sheepshead fish (Archosargus probatocephalus). These fish have large front teeth, which help them crush the shells of crustaceans and are also famous for biting the bait off the hooks of fishermen. Fish are known to have a calming effect on anyone who watches them as they swim peacefully in the aquarium. In general, fish are easier and cheaper to feed and care for than other pets, however, they require a suitable environment and well-informed people, do not underestimate this aspect

ALL the features and curiosities about fish

  • This species is widespread in the North Atlantic Ocean and in the Mediterranean, from Norway to the Baltic Sea to the Canaries and the Black Sea. The ideal habitat is represented by the sandy and loamy bottoms, where this animal hides and feeds.
  • Fish live in water, breathe with gills and are heterothermic animals. Their bodies are covered with scales and swim by moving with their fins. They also have a swim bladder, a kind of bag that swells and deflates, allowing the fish to rise up or down.
  • Fish for sale in animals: immediately discover thousands of ads from individuals and companies and find what you are looking for on Subito.i
  • Unfortunately, mixing the wrong fish can have deadly consequences for some of your pets. Fish diets. Not all fish require the same diet. Like other organisms, a fish is designed with a mouth.
  • Present in the Mediterranean and in the eastern Atlantic Ocean, from the British Isles to Morocco to the Canaries, Azores and Madeira, the seahorse (Hippocampus guttulatus) is a curious-looking fish that prefers to inhabit the seabed rich in algae or covered by meadows of Posidonia, from 1-2 m up to 20-25 m of depth, also often goes into the lagoons

Blob fish: what it is. This fish is undoubtedly one of the rarest to see, both because there are not a large number of specimens on earth, and because when it exists, it is at the bottom of the oceans and not where we normally sail or swim. It is in fact an animal that frequents the depths of the sea, it rarely comes to the surface and when it does, it changes its appearance, therefore. Animals Catfish: everything you need to know about mustache fish. La Ica 20 May 2018. 0 6.565 3 minutes. Catfish is a freshwater fish that eats any residue left behind by other animals. Let's see what are the characteristics of this fish with whiskers which are often associated with stories full of exaggeration. Animals Animal mimicry: the fish is invisible in two seconds. I see, I do not see: this Monacanthus tuckeri is a magician of mimicry and manages to blend into the corals in a few seconds, surprising even the researchers. Two seconds Each fish has its own personality, distinctive behavior and characteristics. You are already in the newsletter of Be Animals! An error has occurred! You are a rainbow trout. Patient, intelligent and determined, when you set yourself a goal, move forward with conviction. Puffer fish Arothron manilensis Puffer fish in the kitchen. The meat of this fish is considered a special dish in Japan, Korea and China. In Japan, the dish is extremely expensive and is called fugu. Beginning in 1958, cooks in Japan have to obtain a special license to cook fugu in their restaurant. They must also study for at least 3 years before being in.

Lean fish, thanks to their low purine and pyrimidine content, are particularly suitable for urinemics. Among fish, the breed is the least protein food, cod the leanest, tuna the most protein, salmon and eel the fattest, herring the one with the highest creatine content. Crustaceans and molluscs , while containing fair amounts of. Water, animal, aquarium, pet, fish images: 15% discount on everything 15ISTOCK Image is in public domain, not copyrighted, rights reserved, free for any use. You may use an image for any personal and commercial use without prior written permission and without cost or obligation Animal proteins, as the name suggests, are contained in foods and food products of animal origin (meat, fish, eggs, milk, cheese and dairy products). Like all proteins, even animal proteins are made up of the concatenation of about twenty amino acids, 8-9 of which are essential, the body, in fact, is unable to synthesize these amino acids in ..

Fish for sale in animals: immediately discover thousands of advertisements from individuals and companies and find what you are looking for on Subito.i 9 - The surgeonfish is a graceful tropical animal, with shades ranging from blue and light blue to yellow. To find out why it is called this, you have to go and rummage under the tail, where it hides two small scalpel-like blades, which it uses for defense Rethink fish. Recent experiments have demonstrated the developed intelligence of these animals: even the smallest cleaner fish are able to score better than many primate species, such as orangutans and chimpanzees, in mental skill tests, giving evidence of a developed memory and understanding. game concept for solving puzzles and finding food.

Often overlooked when it comes to animal welfare, fish are sentient beings with basic needs to be respected on farm, where they have the right to live without disease, stress and pain in an appropriate environment, with appropriate nutrition and with the possibility of expressing a wide range of natural behaviors. Fish welfare is influenced by the quality of the fish. Salmon is present in the North Atlantic Ocean, both in the European and in the American area, but at the moment of reproduction it goes up the rivers that flow there and lays its eggs in the mountain streams: each individual returns to the river that the 'saw the birth, a phenomenon known as homing (from the English home, house). It is a sizeable fish, which can.

Fish in the Treccan Encyclopedia

  1. Being Animals has carried out a new undercover investigation into some fish farms in Greece, a country from which more than half of the sea bream and sea bass sold in Italy come. The images were also disseminated by the Report transmission and document fish living in overcrowded cages. and are thrown still conscious in containers of water and ice where they die later.
  2. Oviparous animal: reproduction occurs by laying fertilized eggs with the growth of the embryo that occurs outside the maternal organism. Birds, fish, monotremes, insects, arachnids, some amphibians and many reptiles are part of the oviparous family.
  3. Animals that start with the letter A. Anchovy also called alice, is a small fish. It forms very numerous banks. It is very popular in the kitchen and its meats are eaten both fresh and salted. Reported by Nicole Aphids also called plant lice, are small parasitic insects of plants. They are often protected from ants as they secrete a sugary substance of which they.
  4. Advice and practical guide to choose the name of your pet based on characteristics and behavior. List of names for Dogs, Cats, Fish, Birds, Reptiles, Rodents.
  5. Fish and marine animals. Here are the English names for the various fish and other creatures that live in the sea. carp (plural: carp) carp: catfish: catfish: cod (plural: cod) cod: dolphin: dolphin: eel: eel: haddock (plural: haddock) haddock: herring: herring
  6. The stonefish, scientific name synanceia verrucosa, is a saltwater fish belonging to the Synanceiidae family. It is a specimen with a stocky body, about 30 cm long, with a particularly large head and mouth, a very large tail. small, folded behind the body

Perch has rather thick head and lips. Perch where it lives. Being a freshwater fish, it prefers weak water rivers and especially lakes. It is a sedentary fish, so much so that some specimens have also been found in brackish lagoons and estuaries. It lives up to 21 years and has diurnal habits. Able to withstand different levels of salinity of the. Pure and impure marine animals. There are also limitations regarding marine species: it is only possible to consume fish with scales and fins and whose scales are easily removable from the animal's skin.

Fish: what they are and their characteristics - ScuolaDeli

In addition to fish, always among the wild animals, unfortunately used as pets, we find reptiles, often exotic mammals, some types of amphibians and even arthropods such as spiders and scorpions. For birds, people keep at home, in a cage or aviary, birds such as parakeets, cockatoos, macaws and other species of parrots, canaries, doves and even ducks. fish today occupy the first place in the ranking of companion animals. Even in front of the four-legged companions par excellence, namely cats and dogs. Here are the 9 reasons for choosing a fish as a pet Animals widespread especially in the more temperate Atlantic, as well as in the sub-tropical oceans, they are very fast fish, erroneously defined as swordfish, which in the genus Makaira especially meets the favor of thousands of sport fishermen, teased by the size, by the combativeness of this agile and combative fish, which can reach up to a maximum speed of 85 km per hour animal fish. Fish that can count up to four (Gambusia) Gambusia are small fish of about 5 centimeters, of North American origin, greedy for larvae and mosquitoes (imported into Europe in the early 1900s precisely to fight mosquitoes and insects that constituted a dangerous vehicle for the spread of malaria) How we ship fish. The shipment of live animals costs € 15 regardless of the number of animals purchased. We ensure that all shipments of fish, plants and other live animals take place in the maximum safety of animals, respecting the health and transport regulations of animals. The fish are placed in a bag suitable for the transport of fish, with a third of water and two.


Benefits Fish meal - Animals - Guar properties extracted meal - PROTFISH as a replacement for fish meal - zootechnical use for animals - raw material for feed - complementary feed Freshwater angelfish, a beautiful animal (Photo Facebook) Probably we have often seen in pet shops some beautiful angelfish in the exposed aquariums, and we were certainly fascinated by them since their appearance is very particular and attracts the eye

15 fish (plus one!) With unexpected talents - Focus

Animals starting with the letter E. Echidna also called spiny anteater is a small, spiny oviparous mammal with an elongated snout. It is widespread mainly in New Guinea, Australia and Tasmania Effimera is an insect that stands out for the shortness of its adult life. In fact, its name derives from the Greek and means that it lives one day Completing the Animal Crossing: New Horizons fish collection can be a real undertaking, both for the rarity of some specimens and for the differentiation of the creatures available based on the month and game time. Here is the complete guide to all the fish in Animal Crossing: New Horizons (in encyclopedia order) with location, period, size and prices. Fish and water animals.Welcome to the Fish and Water Animals section of the Pet Products category at Amazon.co.uk: Discover our selection in Aquarium Furniture, Pumps and Filters, Feed, Aquariums and Fish Bowls, Water Treatment, Cleaning and more. cleaner fish feeds on parasites and foreign substances present on the skin of other fish usually lives in pairs and operates in a specific place, a cleaning station in which it causes the various symbionts to stop and be cleaned up, such as surgeonfish, damsels and manante Fish and Dangerous Animals in the Maldives Islands. There are few dangerous animals in the Maldives, like few recorded accidents. The much feared sharks have never caused any victims, despite their fame and the thousands of dives that are carried out in this archipelago. It is very likely the encounter with these predators, there are shoals known precisely for their presence, but.

Online Shop for Pets, since 2006 food and accessories for dogs, cats, fish and other pets, synonymous with professionalism, courtesy and convenience

Download this free image of Animal Dolphins Fish from Pixabay's vast library of public domain images and videos Koi Fish Animals. 1701 1748 228. Dove Bird Animal. 1428 1401 210. Macaw Parrot. 1427 1067 214. Cat Kitten. 425 397 47. Horses Animals Nature. 620 516 105. Corgi dog. 1085 944 151. Cat Animal. 1432 1245 217. Dolphin Animal Sea. 360 401 62. Seagulls Birds Fly. 1210 1185 129. Tiger Big Cat. 514 527 54. Starfish. The sunfish: curiosities about this particular animal (Photo Flickr) The sunfish, also known as Mola Mola, is one of the most particular marine animals, as well as one of the most enigmatic creatures due to its unusual size and its characteristic appearance 14- Sep-2020 - Explore Flora Piscopo's Colorful Fish Board, followed by 210 people on Pinterest. View more ideas on colorful fish, fish, marine animals Animal Crossing: New Horizons - December fishes. The guide refers to the fish that can be found in the islands located in the Northern (Northern) Hemisphere Let's start with the list, which contains the newly arrived and departed fish

Animals, the first extinct species in 2020 is the Chinese paddlefish: was it a freshwater giant 3 (2) Monsters or shy lovers? What is hiding in the darkness of the oceans? Deep sea fish are rare to spot and never find themselves in groups, but for these deep sea animals finding a partner is of paramount importance. But in the dark of the sea depths, it is really difficult to go in search of company. Then [Photo Credits: Web Animal Crossing: New Horizons guide, fish and insects to be caught by the end of April. The fish and insects on this list should be caught no later than the end of April, if you don't want to wait until next year (or several months) before you can see them again on your island! And if you want to complete the museum, well, roll up your sleeves

By selling a specimen of abyssal fish, in Animal Crossing: New Horizons, you can get 2,500 stars, but if you ask Castorino to evaluate it, the proposed price will be 3,750 stars (+ 50% compared to the selling price). in the box positioned outside the Nook's Shop the value will be, instead, of 2,000 stars (-20% compared to the selling price) Generalities and morphology: Swordfish can measure up to five meters in length and weigh more than 500 kilos, but most of the adults measure between 2 and 3, 50 meters in length, of which a third is represented by the rostrum. The back is purplish-black, the belly bluish-white. Lo si [Tropical Point - tropical fish, aquariums and pet supplies Shop specializing in pet products, aquariums and tropical living. Inside our online shop, and the store in Rome, you will find a wide range of articles and accessories for animals Like all living things, fish also have their needs: clean aquarium, health (yes, they get sick too) and food as needed.. And it is precisely on this that the relationship between human and animal is based. Fish, in fact, like dogs and cats alike, carefully observe how .. What are the animals of the Aquarium of Genoa The Aquarium of Genoa is the second largest aquarium in Europe and the first and most important of all 'Italy

Snakefish is native to Manchuria and Eastern China. In the United States it has found areas where it can reproduce and where it is endangering the other animals in the habitats it has. Ovoviviparous fish . Among other ovoviviparous animals there are also fish. Also in this case, of course, we are faced with female specimens which, unlike other fish, retain the eggs in the belly with the sole function of protecting them. FISH | Lepidosiren Paradoxa, a fish with the lungs. It's not every day that you come across a animal able to surprise us like the Lepidosiren Paradoxa, the only one fish with the lungs of its species Dreaming of exotic, tropical fish: surely these animals have fascinated you for their spectacular beauty this shows your love for beautiful things, even if difficult to obtain you have the patience to carefully cultivate your interiority, from which wonderful ideas are born

FISH AnimalHouseMilan

Marine fish in Animals and Accessories in Friuli Venezia Giulia. Sponsored links. Sponsored links. Sera FD krill 100 ml marine fish Sera FD krill 100 ml marine fish. San Vito al Tagliamento. December 5, 07:48. € 8 Evening. In general, the presence of a pet in the house, even a fish, can be more important than ever during this period (see Taylor Swift who invites you to take the cat as an example.

Fishes Fish are vertebrates perfectly adapted to the aquatic environment, in which they move with great agility. Some of them are herbivores, because they feed on algae and aquatic plants. Nymph Goldfish: it is orange in color and is perfectly the same as the common goldfish. Oriflamme Goldfish: also known as veil tail fish, it is appreciated for its elegant fins. Celestial Goldfish: also known as the crybaby, this variety has protruding eyes that always face upwards Fish, molluscs and crustaceans. Aquaculture is a rapidly growing food production sector. Italy is the third largest producer of shellfish in Europe and the second for the production of salmonids. In particular, 70% of national freshwater production is concentrated in the North East (in particular the breeding of the rainbow cake) and 60% of the production of. A fish with a bird's head: the mysterious animal appears in China, that's what it is It has the body of a fish and the head of a bird, but according to some it would more resemble a dolphin with scales All farmed fish Origin Coop not has undergone treatment with antibiotics in the last 6 months of life: in this way it is possible to counteract the increase in resistant bacteria and give people an extra guarantee for their health. This is why animal welfare is in everyone's interest

Cleaner fishes therefore have characteristics exactly the same as those of all other fishes that populate an aquarium, the difference lies in the fact that they have a more particular and recognizable body and with very specific life habits30 such as to make them animals of which certainly all they talk.. Fish Cleaners breeds. We have so far established that Cleaner Fishes do not clean there. This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website [GUIDE] All the new sea creatures, insects and fish arriving in January on Animal Crossing : New Horizons! By Ettore Giovanni Mottola-22 December 2020. Share. Facebook. Twitter. Whatsapp. Tumblr. Telegram

Other animals Goldfish: the 10 most popular varieties. by Marta Cerizzi DeAbyDay. There is not only one goldfish, but several varieties that differ in shape and color: let's discover the most common ones The most common cold-water fish is goldfish, closely followed by its larger counterpart, the koi. However, there are many other interesting fish that don't require a heated tank. Many cold-water fish are so large that they are only suitable for ponds. Since you are planning to create an aquarium, here is a [20 poultry, horses, birds, turtles for sale or as a gift: they are, discover them with Kijiji. You also find tropical fish

Purchase and storage of salmon. There are, at the time of purchase, some simple steps to ensure that the salmon is fresh. If we buy it whole, we check that the eye is convex and alive, that the flesh is very firm, that the color of the gills is pink and that the scales are bright if we buy it in slices, make sure that the bone adheres well to the. Consignments of live aquaculture animals, fish eggs and ungutted fish destined for a third country but transiting the Community must . meet the same requirements set for import, and the certificate accompanying the consignments must bear the words "for transit through the EC"

The fish - symbology - GonGoff

Animals, the first extinct species in 2020 is the Chinese paddlefish Up to 7 meters long, lived in the Yangtze River. Unfortunately, no specimen is preserved even in the aquarium Read the article on Sky TG24 Fish, birds and turtles: plastic kills animals in the seas Fish are vertebrate animals (they therefore have a bone skeleton just like us) that breathe through gills (they exist) but also fish that are able to breathe atmospheric air through well-developed lungs). Alone they constitute more than half of all the rest of the vertebrates put together (mammals, birds, reptiles and amphibians). These fish live mainly in warm seas, avoid the proximity of the coasts and sometimes enter the mouths of rivers. They are predators that only target live animals. Larger barracudas with one bite can sever their prey in two and are as dangerous to humans as sharks

Fish have warm or cold blood - chemistry-onlin

News 2 min In Animal Crossing: New Horizons, insects and fish are getting out of hand Need to open a museum? I have something ready for you! semi-cit Fish eggs are considered on the basis of the lawfulness of the fish itself. Earthly creatures. This term includes all animals that live on the face of the earth. Allah (SwT) has allowed the food use of some of these and has declared others illegal. The aquarium is not collecting, but it is conscious and responsible breeding of pets. Even fish have needs and dignity equal to those of all the other animals we keep at home. I am not just a fish. In the foreground. Let's know them better 17 October 2003 Psychrolutes marcidus, known as blob fish, elected in 2013 by the Ugly Animal Preservation Society as the ugliest animal in the world For the card and all the information on these animals, I would like to point out: clownfish or nemo. Note: if the clownfish is easy to keep, the anemone (the filter animal with which it establishes a symbiosis) is not at all as it can wander in the tank and occupy unwanted portions of the aquarium and annoy other animals (corals and fish)

Fish that has fins and scales is kosher and parve. Parve food can become milk if cooked with milk or derivatives, and meat if cooked with meat derivatives. Meat. The basic laws that define which animals, birds and fish are kosher are illustrated in Leviticus, chap. XI As far as nutrition is concerned, goldfish are omnivorous animals and need little but complete food every day. In our stores you can find both flake and granule feed, but it can also be fed with fresh food such as artemie chironomus and daphnia. Goldfish can live from 20 to 30 years. Each goldfish needs a minimum of 100 liters of water. Goldfish can reach an adult size of 30cm Goldfish are more vulnerable to disease when living in an aquarium, best to keep them outdoors, even in winter, don't worry about the cold

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The Looks, as we have already mentioned, they have refined and delicate meats therefore it is preferable to consume them as soon as possible (max 2 days from purchase) or they must be stored at a temperature of -18 °, the flavor will never be the same again.

The most famous and well-known recipes for cooking a glance I'm:

  • Look at the Mediterranean Cartoccio
  • Look at the Oven with Potatoes

Video: Urban Banx Carp Fishing FULL MOVIE Alan Blair in EUROBANX + 11 languages - NASH 2014 DVD

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