CATDOLL : CATDOLL: Four major economic fish species? Four major economic marine fish species?

1. What are the four major economic fish?

Small yellow croaker, large yellow croaker, hairtail and squid.

Small yellow croaker

Small yellow croaker, also known as small yellow croaker, plum rain, small croaker, etc. Small yellow croaker is similar to large yellow croaker in shape of willow leaf, but with smaller head and eyes, short and wide tail stalk, and larger scales; small yellow croaker has gray-brown back and golden yellow on both sides of abdomen.

Large Yellow Croaker

Large yellow croaker, class of bony fish, order of Perciformes, family of Sciaenidae, genus Pyrrhoceros, also known as yellow croaker, king fish, big fresh, big yellow croaker, red melon, golden dragon, golden dragon, osmanthus yellow croaker, Da Zhong, red mouth, stonehead fish, stone fish, cucumber fish, is one of the traditional "four major seafoods" and the main economic fish in my country's coastal waters.

Hairtail

Hairtail, also known as knife fish, toothed hairtail, fat hairtail, oily hairtail, etc. Hairtail is flattened like a hairtail, with a pointed head and a large mouth, and no scales on the body.

2. What are the four major economic marine fish?

Hairtail, large yellow croaker, small yellow croaker and cuttlefish are the four major economic fish species in China. Numerous rivers and lakes provide favorable conditions for the development of freshwater aquaculture. Since 1990, China's aquatic product output has been among the highest in the world, accounting for about 1/6 of the world's total aquatic output.

Zhoushan Fishery is the largest fishery in my country. It is located in northeastern Zhejiang, east of Hangzhou Bay and southeast of the Yangtze River Estuary. The fishing ground covers an area of ​​about 53,000 square kilometers. It is the traditional fishing area for fishermen from Jiangsu, Shanghai, Zhejiang, Taiwan and one city. The main economic fish products are four major fish species: large yellow croaker, small yellow croaker, hairtail and cuttlefish.

3. What are the four major economic fish species in Zhongshan?

The "four major carps", mainly grass carp and bighead carp, are traditional aquaculture species in Zhongshan. Last year, the aquaculture area exceeded 145,319 mu. In recent years, due to the continued low prices of the "four major carps", most aquaculture farmers have no money to make or have suffered losses, which has directly affected the overall benefits of Zhongshan's aquaculture industry.

To this end, the fishery department of Zhongshan City has vigorously adjusted the breeding structure with market benefits as the center during the spring release and breeding this year, encouraged the increase of breeding of high-efficiency and high-value aquatic species, and reduced the breeding area of ​​the "four major carps". This year, each town and district reduced the area of ​​the "four major carps" by 10,476 acres, and strive to reduce it by half within three to five years.

4. What are the four major families of fish?

The four major carp species: black carp, grass carp, silver carp and bighead carp.

1. Black carp (Mylopharyngodon piceus) is also called black carp. It has large scales all over its body. It looks very similar to grass carp, but its scales and fins are gray-black. This is where the name of black carp comes from. Its scales are large and thick. Its tail is thinner and longer than that of grass carp.

2. Grass carp is also known as silver carp, oil silver carp, grass silver carp, white silver carp, grass carp, grass root (Northeast China), mixed fish, black silver carp, etc. It has a long and "delicate" body, with a green-yellow body color and a slightly white belly. Its scales are large and thick. Its dorsal fin, pectoral fin, pelvic fin and caudal fin are smaller and shorter than those of silver carp.

3. Silver carp, also known as silver carp, bream, water carp, jumping silver carp, and silver carp, belongs to the order Cypriniformes, family Cyprinidae, and is one of the four famous carps. It has a flattened, slightly high, spindle-shaped body, with a bluish-gray back and white sides and abdomen. The pectoral fin does not exceed the base of the pelvic fin.

4. Bighead carp (Aristichthys nobilis (Richardson)) is also called silver carp, yellow carp, bighead carp, fathead fish, Baotou fish, bighead fish, black carp, and bighead carp, and is also called male fish.

5. What are the four major branches of jawed fishes in the Devonian period?

Four major branches of jawed fish: armored fish (Dunkleosteus), acanthidae, cartilaginous fish (sharks), and bony fish

6. What are the four major marine economic fish species?

my country's four major marine economic fish are large yellow croaker, small yellow croaker, hairtail, cuttlefish, and cuttlefish.

7. 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.

8. 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.

9. What are the four black fish that are special to Songhua River?

The four kinds of precious fish produced in the Songhua River basin are locally called Aohua fish (Mandarin fish), Bream fish (Bianhua fish), Jihua fish (Jihua fish, Crucian carp) and Daozi fish.

Fish

Siniperca chuatsi (Basilewsky) is also known as Mandarin fish, Osmanthus fish, Seasonal flower fish, Fat Mandarin fish. It has a relatively high body, flattened sides, and a bulging back. It has a large head, a slightly slanted mouth, a protruding lower jaw, and an upper jaw that extends back to the posterior edge of the eye. There are canine-like small teeth in the front of the upper and lower jaws. The posterior edge of the preoperculum is serrated. The pylorus is about 200 cm long.

It lives in still water or slow-flowing waters. It has the habit of lying in the sunken places at the bottom of the lake and is active at night to look for food. It is a ferocious fish and eats other fish and shrimps. The reproductive season is from May to July, and it lays floating eggs. The meat is of excellent quality and has few fine spines. It is known as a precious fish. The yield is relatively high.

Seasonal flower fish

Artificial breeding and rearing have been tried. They are distributed in major water systems across the country.

It is widely distributed, and can be found in all important water systems across the country.

Bream

The bream flower fish is also known as Changchun bream, which belongs to the Cyprinidae family. Its scientific name is Parabramis pekinensis (Basilewsky), and its common names include bream, long-bodied bream, grass bream, oil bream, etc. Its body is laterally flattened and diamond-shaped. Its ventral ridge is obvious, and the dorsal fin spines from the pectoral fin to the anus are thick and smooth. Its anal fin rays are 3, 28 to 34.

Lives in the middle and upper layers of water bodies. Herbivorous. Reproductive season is from April to August, with the peak from June to July. Lays drifting eggs in flowing water. Grows slowly, with a common weight of about 1 catty, and the heaviest can reach 4 catties. The meat is delicious and is a valuable economic fish. Can be used as a breeding object. Distributed in major water systems across the country.

Seasonal flower fish

The scientific name is Hemibarbus maculatus Bleeker, also known as crucian carp, Jihua, Jihua hook, Jiyu, Jilangyu, Jigulang, belonging to the Cyprinidae and Gobioidea subfamily. The body is long, and the starting point of the dorsal fin is significantly raised. The abdomen is round, the sides and back of the body are blue-brown, the abdomen is white, and there are varying numbers of black spots on the middle axis of the body. The snout is round and blunt, the lower mouth is horseshoe-shaped, there is a pair of whiskers at the corners of the mouth, and the eyes are protruding. It is a bottom fish, preferring to live in the middle and lower layers of the water body, and migrating to the deep water of rivers in winter to hibernate. It feeds on benthic animals, mainly aquatic insects and mollusks, and also eats various small fish. The largest individual can reach 2 kilograms. The spawning period is from June to July, with a carrying capacity of 48,000 to 130,000 eggs. The eggs are sticky and stick to the plant substrate. When the water temperature is 20℃, the seedlings will hatch after 4 days. It has a lot of meat and few bones. The meat is white and tender, shaped like garlic cloves. The meat is firm and delicious. It is a top-quality edible fish among freshwater fish.

Island fish

Daozi fish is also known as white fish. Since ancient times, fishermen on the Songhua River have used river water to boil white fish to entertain guests, which has become a legend. Later, cooking masters devoted themselves to the creation of the famous Jilin dish "steamed white fish".

10. What are the characteristics of fish?

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.