What are the animals of fish? What kind of animals do fish belong to

Fish are generally divided into two categories: jawless and jawed.

Jawless vertebrae are cylindrical and lifelong and have no upper and lower jaws. The gills originating from the endoderm are sac-shaped, so they are also called cysts; The brain is well developed, generally with 10 pairs of cranial nerves; There are pairs of visual and auditory organs. The inner ear has 1 or 2 semicircular canals.

There is a heart, red blood; The epidermis is made up of multiple layers of cells. The even-fins are underdeveloped, and some archaeotic beetle fishes have pectoral fins. There are different classifications of jawless species, but they are generally divided into:

Hagfish, headfish, lamprey, finned turtle.

Jawed animals have upper and lower jaws. most have pectoral and pelvic fins; The endoskeleton is well developed, the adult notochord is degenerate, with a spine, and rarely a bony exoskeleton. The inner ear has 3 semicircular canals.

Gill are formed by ectodermal tissue. It is composed of shieldfish, cartilaginous fishes, echinosaurs and bony fishes. Among them, there are only fossil species of the class Shieldfish and Acanthida.

It is distributed all over the world, mainly inhabiting low-latitude sea areas, and some species inhabit freshwater. The extant species belong to the subclass Plategill and the Holocephalic subclass. There are about 600 species of plategill subclass, about 180 species in China, and most of them in the South China Sea.

There are about 30 species in 3 families and 6 genera in the whole subclass, and about 5 species in 3 genera and 2 families in China. The endoskeleton of the bony fish class is ossified, with bony sutures, and the head is often covered with membranous bones, and the body is covered with hard or bony scales. It is the most abundant branch of living fishes, which can be divided into three subclasses: total finned subclass, lungfish subclass and radial fin subclass.

The radial-fin subclass is the largest group. Among them, perciformes have the most species, except for cypriniformes, which are distributed in freshwater and salmoniformes, which are mostly anadromous fishes, and the other orders are mainly distributed in the ocean. Herring and cod are the highest in world fishery production today, followed by cod, which accounted for nearly half of the world's total fishery production that year.

There are more than 2,000 species of bony fish in China's coastal waters and more than 700 species of freshwater bony fish.

Hairtail, yellow croaker, crucian carp, tuna, trout, carp, carp, herring, grass carp, black fish, sardines, catfish, mackerel, cuttlefish.

Herring, grass carp, silver carp, bighead carp, carp, Chinese sturgeon.

What do you think you can count the fish? There are a bunch of unknown deep-sea fish

Fishes belong to ectothermic aquatic vertebrates. Fish swim and feed by gills breathing, by the oscillation of the tail and trunk, and by the coordination of fins. There are currently about 32,100 named fish species worldwide.

Fish are mainly divided into: tropical fish, temperate fish and cold ribbon fish.

Generally, vertebrates are divided into five categories: fish, birds, reptiles, mammals, and amphibians.

Fishes are the oldest vertebrates, and they inhabit almost every aquatic environment on Earth, from freshwater lakes and rivers to saltwater seas and oceans.

Fish is rich in thiamine, riboflavin, niacin, vitamin D and a certain amount of calcium, phosphorus, iron and other minerals.

Vertebrates. Aquatic fish are divided into: freshwater fish and saltwater fish. Animal characteristicsThe fish character pinyin (yú), fish (fish) is the oldest vertebrate.

Fishes are ectothermic aquatic vertebrates that swim and feed with their upper and lower jaws by respiring with their gills, swinging their tails and trunks, and feeding on their upper and lower jaws, and belong to the vertebrate subphylum of chordates, and generally divide vertebrates into five categories: fish (53%), birds (18%), reptiles (12%), mammals (9%), and amphibians (8%). According to the statistics of the late Canadian scholar Nelson in 1994, there are 24,618 species of fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year, and more than 1,500 species should have increased in more than ten years, and the number of named fish species in the world is about 32,100 species.

Belong.

Fish, the oldest vertebrate.

Some offspring of crosses with different chromosome numbers are still fertile. They inhabit almost every aquatic environment on Earth, from freshwater lakes and rivers to saltwater seas and oceans.

Fishes are divided into two general classes: jawless and jawed, jawless includes roundmouth and armor, and jawed includes shield fishes and cartilaginous fishes.

Most fishes live in water all year round and breathe with gills.

Flat type. Among the three body axes of this type of fish, the left and right axes are particularly long, and the dorsoventral axis is very short, so that the body shape is flat up and down, and the movement is slow, which is not as flexible as the first two types, and has a benthic life.

Anglerfish in the class Radiata.

Rock climbing loach, flatfin loach, rays, rays, etc., which are common in the class of cartilaginous fishes. and the entire class of Ichthyidae.

Most of them inhabit the bottom of the water and are sluggish.

Fish belong to the group of ectothermic aquatic vertebrates.

Fish breathe through their gills. There are now 24,618 species of fish discovered, and new species are being discovered all the time, reaching an average of 150 new species per year.

Fish are mostly cold-blooded, and a few are warm-blooded, breathing with gills and having jaws and fins. Extant fish can be divided into two main groups: cartilaginous fishes (such as sharks, etc.) and bony fishes (fishes with linear and wavy fins).

The fishes of both groups were first out of the Devonian.

Early. A more advanced group of linea-finned fishes is called bony fish, which was found in the Jurassic.

It has become the fish with the largest number of individuals. There are also several extinct species of fish.

The fish we eat belong to vertebrates, and animals with or without vertebrates can be divided into vertebrates and invertebrates. Among vertebrates, fish are a separate group.

Fish are invertebrates, and fish are marine animals, and I think that's all right.

Fish belong to the category of ectothermic aquatic vertebrates, which are ectothermic aquatic vertebrates that breathe in their gills, swim through the oscillation of their tails and trunks, and coordinate their fins, and feed on their upper and lower jaws.

Fish are vertebrates that move in the water with gill breathing, through the oscillation of the tail and trunk, and the coordination of fins. At the same time, fish is also one of our favorite dishes, its meat is delicate, delicious, and has a high meat content, which is a delicacy suitable for all ages.

Fish, the oldest vertebrate. Fishes are divided into two general classes: jawless and jawed, jawless includes roundmouth, armor, jawed includes shield fish, cartilaginous fish, radial finned fish, most fish live in water all year round, breathe with gills, use fins to assist body balance and movement of ectothermic vertebrates, there are also like African lungfish, mudskippers, climbing perch can survive on land for a long time, and blackfish, yellow eel, gar rely on a single swim bladder to breathe, although most fish are cold-blooded, but many sharks and tuna are semi-homeothermic, Moonfish are homeothermic.

There are more than 36,000 species of living fish in the world, accounting for most of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year, and the number should have increased by more than 1,500 in more than 10 years.

Fish belong to ectotherms.

Aquatic animals, vertebrates.

Fish are generally cartilaginous fishes.

It can be divided into freshwater fish and saltwater fish, or tropical fish, temperate fish and cold bandfish. Most fish are cold-blooded, and a few are warm-blooded and breathe with gills.

The body structure of the fish

Fish bones are divided into two categories, cartilage and hard bones, according to their nature. Cartilaginous fishes.

Cartilage is maintained for life, and the calcified cartilage is also called calcified cartilage due to the calcareous precipitate in the soft matter. The ** of fish is composed of the epidermis, which is very thin and consists of several layers of epithelial cells, and dermis.

Composed of the germinal layer, the epidermis can continuously secrete a sticky and slippery liquid, so that the body surface can form lubrication and protect the fish body, such as reducing the friction resistance.

The appendages of fish are fins, which are locomotor organs for swimming and maintaining body balance. The fin is composed of a branched fin basal bone and a fin bar, and the fin bar is divided into two types, one is the angular fin bar, which is not segmented or branched, and occurs from the epidermis and is found in cartilaginous fishes; The other is the scaly fin, or bony fin, which is derived from the scales and is segmented, branched or unbranched, and is found in bony fishes.

The fins are connected by thin fins.

There are about 32,000 species of fish found in the world, and the fish live in the water, distributed in the ocean and freshwater, with two-thirds of the fish living in the ocean and the rest living in freshwater.

Fish belong to the group of vertebrates.

Fishes breathe in the gill and swim through the oscillation of the tail and trunk and the coordination of the fins and the upper and lower jaws.

Feeding ectothermic aquatic vertebrates, belonging to the phylum Chordates.

In the subphylum Vertebrates.

Generally, vertebrates are divided into fish, birds, and reptiles.

There are five major categories of mammals and amphibians. According to the statistics of the late Canadian scholar Nelson in 1994, there are 24,618 living species of fish in the world, accounting for more than half of the named vertebrates.

Fish belong to the group of ectothermic aquatic vertebrates.

Fishes are ectothermic aquatic vertebrates that swim and feed with their upper and lower jaws by respiring with their gills, swinging their tails and trunks, and feeding on their upper and lower jaws, and belong to the vertebrate subphylum of chordates, and generally divide vertebrates into five categories: fish (53%), birds (18%), reptiles (12%), mammals (9%), and amphibians (8%).

According to the statistics of the late Canadian scholar Nelson in 1994, there are 24,618 species of fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year, and more than 1,500 species should have increased in more than ten years, and there are currently about 32,100 species of named fish species in the world.

Grass carp, carp, guppies, arowana, goldfish.

1. Grass carp: grass carp is a typical herbivorous fish, inhabiting rivers and lakes in plain areas, and generally prefers to live in the middle and lower layers of water and near-shore aquatic grass areas. Sexually active, swims quickly, and often forages in groups. Grass carp larvae eat larvae, algae, etc., and grass carp also eat some meat, such as earthworms, dragonflies, etc.

2. Carp: Carp is commonly known as carp, hairy, etc., and belongs to the carp family. The body is flattened on the sides and the abdomen is round, the mouth is horseshoe-shaped, and the beard is 2 pairs. The dorsal fin is long at the base, and both the dorsal and anal fins have a stout serrated spine.

The body sides are golden yellow, and the lower leaves of the caudal fin are orange-red. Carp usually inhabit the bottom of water bodies with aquatic weeds in rivers, lakes, reservoirs, and ponds, and mainly eat benthic animals.

3. Guppies:

The peacock medaka is an omnivorous small fish species. They are very resilient to the environment, and are distributed in the lower reaches of rivers, lakes and marshes and ditches in some tropical areas, and their wild habitats are diversified, mainly inhabiting freshwater basins and lakes and marshes. It can tolerate polluted water bodies and has clustering.

Widely distributed. It is native to Venezuela, Guyana, the West Indies, northern Brazil, and other places in South America.

4. Arowana: The whole body of the arowana flashes with cyan light, the round scales emit a pink glow after being irradiated by the light, and the fins also show various colors. Different Arowana have their different colors. For example, the scales of the juvenile red dragon fish in Southeast Asia are small red and reddish white, and the edges of the gill cover and gill tongue are dark red when they are adults, and the scales are shining.

**Dragons, platinum dragons, and green dragons have golden, white-gold, and cyan scales on the edges, with purple-red patches being the most valuable.

5. Goldfish: Goldfish is one of the world's three famous ornamental fish, originated in China, and has a history of more than 1,700 years. Goldfish occupies a very important position in China's ornamental fish exports. Goldfish has a beautiful body and a wide variety of species, its body color is red, yellow, blue, purple, black, white, two-color, three-color, five-flower, etc., its body shape has lion head, high head, blister, dragon eye, pom-pom, pearl scales, butterfly tail, tiger head and so on.

Hairtail, yellow croaker, crucian carp, tuna, trout, carp, carp, herring, grass carp, blackfish, sardines, catfish, and so much more!

Generally speaking, the fish next to the word fish are all fish, but a few such as whales and white-sided dolphins are not fish, they are mammals, and giant salamanders are amphibians.