CATDOLL : CATDOLL: What is the most abundant fish species in the world?

1. What are the most numerous fish species in the world?

The production of herring is very high. The number of herring is the first in the world. It is the most abundant fish in the world. It is a marine fish. They live in the sea. If we are not familiar with the name of herring, we must have heard of another name. That is black carp, herring is what we often call black carp. In our country, due to the production of herring, herring is mainly produced in the South China Sea. The reason for the high production of herring is that the price of herring is also very affordable.

2. What is the most numerous fish in the world?

Based on current observations, we generally believe that the most common ray-finned fish species on Earth are

Stomiiformes

Gonostomatidae

Cyclothone

Cyclothone pallida or its close relatives are also translated as "Cyclothone pallida".

Because of their brush-like and bristle-like jaw teeth, the 13 species in this genus are called "bristlemouths" or "bristlefishes" in English.

Hidden Bristlemouth, Cyclothone obscura

But they are also likely the most numerous vertebrates on Earth. There are at least 5x10^19 of them, which is four times the population of all flies, 50 times the population of all ants, and 65 million times the population of humans.

A small warm-water deep-sea fish with a distribution range from 25m to 4938m. However, it is generally distributed at the junction of the bottom of the middle layer of the ocean and the top of the semi-deep sea at an average depth of 300-800m, which belongs to the middle-to-deep sea area. Therefore, it is difficult to be observed by people along the coast. It is distributed in the East China Sea and the South China Sea of ​​my country.

Like most fish of this order, the light organs on the abdomen can provide supplementary light to produce an "anti-concealment effect", thereby eliminating its own shadow, making it easier to hunt or avoid natural enemies.

3. What is the relationship between the number of fish bones and evolution?

The scientific name of fishbone is intermuscular bone. It is a small bone distributed in the muscle septa on both sides of the vertebrae of fish. It mainly grows in the body of lower teleost fish.

Paleontologists have found that as fish evolved, the number of intermuscular bones went from few to many, then back to few, and finally disappeared. It can be said that the number of fish bones partially reflects the evolutionary history of fish.

4. What are the types and numbers of animals in China’s wetlands?

Wetland Birds

my country is rich in wetland bird resources. According to wetland surveys and statistics, there are 271 species of wetland water birds in 12 orders, 32 families, etc., mainly cranes, herons, geese and ducks, plovers, gulls, storks, etc. In addition, there are a small number of raptors and songbirds, many of which are rare and endangered. There are 56 species of wetland birds in 10 orders, 18 families, and 12 species of wetland birds that are listed as national key protected species. Among them, there are 44 species that are listed as national second-level key protected species. Among the 57 endangered birds in Asia, 31 species are found in Chinese wetlands, accounting for 54%; there are 166 species of geese and ducks in the world, 50 species are found in Chinese wetlands, accounting for 30%; there are 15 species of cranes in the world, 9 species have been recorded in China, accounting for 60%; in addition, there are many transnational migratory birds.

Wetland birds are the most representative group of wetland wildlife. According to their residence type, they can be divided into four categories: summer migratory birds, winter migratory birds, resident birds and migratory birds. Summer migratory birds and migratory birds are dominant in the cold temperate and temperate zones in northern my country, while winter migratory birds and resident birds are dominant in the subtropical and tropical zones in the south. Many migratory birds breed in the north and spend the winter in the south.

Wetland fish

Most of my country's river wetlands, lake wetlands and coastal wetlands have moderate water temperature, good light conditions and rich aquatic biological resources, which provide abundant food for fish. Therefore, there are many fish species and high economic value. There are about 3,000 species of fish in my country, of which more than 1,000 species are found in wetlands, accounting for 1/3 of the country's fish species. Wetland fish are composed of inland wetland fish, offshore marine fish, estuarine brackish water fish and estuarine migratory fish (State Forestry Administration, 2001).

There are many kinds of fish in inland wetlands, including 13 orders, 38 families and about 770 species (including subspecies, the same below). Among them, the northern region is dominated by cold-resistant fish such as salmonids, fennel, dogfish, and burbot. In addition, there are some species of carp, cob and thornfish; in the northwest plateau area, there are cob adapted to plateau rapids, drought and salt tolerance, and naked fish of Qinghai Lake; carp are particularly abundant in the Jianghan Plain area, which is the center of freshwater fisheries in my country; the southern and southwestern regions are dominated by carp, cob and catfish species. Swamp wetlands are the spawning and breeding places for many fish. For example, the swamp wetlands in the Sanjiang Plain are the breeding grounds for cold-water fish (such as sturgeon, salmon, and sturgeon).

There are three areas for offshore marine fish. There are more than 250 species of fish in the Yellow Sea and Bohai Sea, including small yellow croaker, cod, Pacific herring, etc. The East China Sea is the main shallow sea fishing area in my country, with more than 700 species of fish, including hairtail, large yellow croaker, small yellow croaker, pomfret, bream, sea bream, conger eel, etc. There are 800 species of fish in the South China Sea, including sea bream, blue round trevally, sardines, golden croaker, tuna, bonito, swordfish, shark, etc.

There are 60 species of brackish water fish in the estuary and 20-30 species of migratory fish across the estuary.

Wetland Amphibians

Amphibians are the transitional type from water to land among vertebrates. In addition to the fact that their adult structure is not fully adapted to terrestrial life and they need to return to the water frequently to keep their body surface moist, they must lay their eggs in the water during the breeding period, and the hatched young animals must live in the water; some species even live in the water for their entire lives, so all amphibians are classified as wetland animals. According to statistics, there are 3 orders, 11 families, 45 genera and 300 species of amphibians in my country. From the perspective of animal zoning, the Oriental kingdom is dominant, followed by the Palearctic kingdom, and there are fewer widely distributed species. There are 7 species in 2 orders, 3 families and 2 species under national key protection. They are mainly distributed in the south of the Qinling Mountains and the Huaihe River, with the most species in the southwest. Among amphibians, there is only one species of the order Apoda, the Xishuangbanna fish newt, which lives in the wetlands of Xishuangbanna, Yunnan; most of the Caudata are aquatic wetland species, such as the giant salamander, the Guizhou warty newt, and the oriental newt; the number of Apoda is large and the distribution is very wide.

Wetland reptiles

Reptiles are true terrestrial animals that are fully adapted to life on land, but some of them live in semi-aquatic and semi-terrestrial wetlands and are typical wetland species. However, some of them return to live in water (seawater or freshwater) and some often live in or near water. Among the 412 known species of reptiles in my country, 3 orders, 13 families, 49 genera and 122 species should be classified as wetland wild animals. From the perspective of animal zoning, the Oriental kingdom still has a clear advantage. Among them, except for the Testudinidae, some species of the Serpentidae are distributed in southern my country and belong to the Oriental kingdom. The Palearctic kingdom is concentrated in some species of the Iguanidae family of the Lizard order. There are not many widely distributed species, and the common ones are turtles, tortoises, red-chained snakes, pit vipers, etc. There are 3 orders, 6 families and 12 species under national key protection.

Wetland mammals

There are 31 species of wetland mammals in my country, belonging to 7 orders and 12 families, accounting for about 6.2% of the total number of mammals in my country. There are 23 species in 5 orders and 9 families under national key protection. Unlike wetland amphibians and reptiles, wetland mammals have more widespread species. They live in water or often move around on the banks of rivers and lakes; such as the Baiji dolphin, the Yangtze finless porpoise, the otter, the mink, etc.; they are suitable for humid and watery living conditions, such as the elk, the giant musk shrew, the vole, etc.; wetland mammals that often appear, such as the badger and Tibetan gazelle in the northwest Sichuan swamp, the wolf, black bear, and roe deer in the Sanjiang Plain wetland, etc.

Invertebrate Crustaceans

Invertebrate crustaceans belong to the phylum Arthropoda and class Crustacea. There are more than 7,500 species in the world. It is a relatively large animal group. Most of the species are marine, and there are not many freshwater species. Crustaceans are not only numerous in species, but also diverse in ecological types. According to their ecological habits, they can be roughly divided into two categories: planktonic crustaceans and benthic crustaceans. The former are generally small and live a planktonic life, while the latter often live a benthic life. Among the crustaceans distributed in China's waters, there are more than 600 known crab species, more than 300 shrimp species, and 42 krill species. Most crustaceans are marine species. Although there are few freshwater species, they are widely distributed.

5. What animal doesn’t look like a fish but is a fish?

The lancelet is known as the least fish-like fish.

Amphioxus, also known as Bai's lancelet, slug fish, double-pointed fish or sea hair, is a precious marine animal. Due to its extremely special morphological structure, it has the characteristics of both invertebrates and vertebrates. It is a typical representative of the transitional type from invertebrates to vertebrates. Therefore, it is highly valued by the biological community at home and abroad.

The appearance of lancelet is very strange and interesting. It has a very small body, flattened on the left and right sides, pointed and thin ends, and a spindle-shaped body. It is generally only 4 to 5 cm long.

6. What type of fish is tilapia?

Tilapia - native to Africa, it is a tropical fish. The genus Tilapia includes more than 100 species, including subspecies. Tilapia has the characteristics of fast growth, high yield, omnivorous diet, few diseases and strong reproductive capacity.

7. Fish characteristics?

The shape, body temperature, bones and skin of fish are different from those of other animals. In addition, fish have an organ that other animals do not have - the swim bladder. The existence of the swim bladder is also the reason why fish can float in the water.

1. Shape

Fish have a variety of shapes, sometimes quite different, but in general most fish are elongated and streamlined. Generally speaking, fish that swim fast in the water have elongated bodies, while fish that swim slowly or live at the bottom of the water are relatively flat. But some fish have very strange shapes, such as seahorses. The smallest fish is less than 1 cm, and the largest fish (whale shark) can reach 18 meters.

2. Body temperature.

Fish are cold-blooded animals. The body temperature of some tunas and sharks (especially sharks of the family Carcharhinidae) is higher than the temperature of the surrounding environment. Bluefin tuna is the only warm-blooded fish.

3. Bones

The skeleton of a fish is made of cartilage (cartilaginous fish) or bone (bony fish). There are four to seven gills on both sides of the skull, of which the front one has evolved into the zygomatic bone. The spine of a fish is connected to the skull, the ribs in the chest are connected to the spine, and there are long spines extending from the spine on the back, tail and abdomen.

4. Skin

Fish have two layers of skin: the outer layer contains glands that secrete mucus, and the inner layer contains many connective tissues, scales and pigment cells. The outer layer of mucus helps fish reduce drag when swimming. Cartilaginous fish do not have mucus, but the tiny, tooth-like protrusions on their skin have a similar function.

5. Fish bladder

The swim bladder is an inflatable sac-like organ in the fish's body. Its main function is not breathing. Fish rely on the swim bladder to adjust their specific gravity. Fish can use the swim bladder to slowly rise or descend without moving. Most bony fish have a swim bladder, an organ for regulating buoyancy.

8. Cold-resistant fish?

All fish species in northern China are cold-resistant, such as the common carp, crucian carp, silver carp, bighead carp, grass carp, black carp, sturgeon, black carp, loach, yarrow, schizothorax and so on.

9. Marine fish?

A: There are many kinds of marine fish. Common ones include shark, yellow croaker, horseface fish, eel, ox tongue fish, Spanish mackerel, snapper, silver pomfret, turbot, hairtail, etc. These fish contain a lot of vitamins, collagen and unsaturated fatty acids, which are good for the body. Not only can they supplement nutrition, but they can also improve skin quality, and they are low in fat and will not make you fat.

10. Unpopular fish?

Freshwater perch is commonly known as perch, also known as flower perch. It tastes delicious, has few fine bones, tender and white meat, and basically has no fishy smell.

Eel is also called eel. It contains calcium, vitamin A and other nutrients.

Catfish is also called bearded fish. It is rich in protein and fat, with few bones, tender meat and rich flavor.

Bighead carp has a big and fat head.

Northeastern flatmouthed goby.

Stream flatnose goby.

Pseudohylidium trilineatum