CATDOLL : CATDOLL: How many kinds of freshwater fish are there?

1. How many kinds of freshwater fish are there?

Among the freshwater fish in my country, some species are widely distributed and can be found almost everywhere, such as grass carp, bream, triangular bream, red-eyed trout (etc.) that feed mainly on aquatic plants; silver carp, bighead carp, etc. that feed on plankton; omnivorous carp, crucian carp, etc.; others such as flower catfish, wheatear fish, Da's snakehead, silver carp, striped fish, club flower fish, yellow eel, white eel, flower loach, loach, catfish, as well as common ferocious fish such as black snakehead, mandarin fish, bighead carp, etc.; in addition, there are mild carnivorous fish such as red carp, Mongolian red carp and black carp.

In addition to the above-mentioned widespread species, there are also many common species in local waters. There are about 90 species of fish in the Heilongjiang River and its tributaries in Northeast my country, including about 50 species of carp. Because the Heilongjiang River is located in the temperate and subarctic zones, it produces a lot of cold-water fish. Common species with greater economic significance include Taimen, Smelt, Ussuri Whitefish, Arctic Grayling, Sturgeon, Dabry's Whitefish, Pike and migratory salmon. In addition, there are also endemic species in the north, such as Asian Smelt, Northern Loach, Heilongjiang Duven, and Variegated Duven.

As the geographical location moves southward, there are more and more temperate fish in rivers, while cold-water fish are gradually decreasing. There are about 70 species of fish in the Liaohe River system, and there are also northern species in its upper reaches; there are about 140 species in the Yellow River system and about 300 species in the Yangtze River system. There are very few cold-water fish in the two. In addition to the common important economic fish such as silver carp, grass carp, bighead carp, bream, bream, bream, red-eyed trout, and mullet, there are also endemic species such as shad.

The upper reaches of the Yellow River and the Yangtze River and some rivers in the Northwest Plateau have very special fish species due to the terrain. For example, there are 13 species of schizothorax and 8 species of schizothorax in the Cyprinidae family. Local endemic species include spotted naked carp, Xinjiang double-lip angler, Chinese saw-barbed barb and white armored fish.

The Pearl River system is rich in fish resources, with a total of more than 260 species. In addition to species that are widely distributed throughout the country, there are also some special types of fish, such as the giant mullet and the silver carp, as well as species unique to South China, such as the dace, the silver carp, the four-barbed dace, the straight-mouthed dace, the tang fish, and the South China carp.

The plateau rivers in southwest my country, such as the Yarlung Zangbo River, Nujiang River, Lancang River, and Jinsha River, have fast currents in many sections and average fish resources. For example, the genera of Cyprinidae, such as the genera of Dongpo Cyprinidae and the genera of Dahurian, the genera of Cobitidae, the genera of Sphaerocephalus, and the genera of Exostomatidae are the same as those in India, Myanmar, Vietnam, and Thailand. In addition, the genera of Schizothorax, the genera of Naked Schizothorax, and the genera of Basilisk are the same as those in the northwest plateau.

2. How to raise flat fish

(1) Feeding. There are two main types of feed: fresh fish and artificial compound feed. Because the mouth of golden pomfret is small, the fresh fish must be fresh and minced to prevent fish bones from getting stuck in the throat and starving to death. From June to August, the daily feed amount is more than 20% of the fish's body weight, and it is fed twice a day. At other times, the feed amount can be appropriately reduced according to the situation. In order to accelerate the growth rate, the daily feed amount can be increased to about 40% of the fish's body weight, and the number of feedings can be increased to 3 to 4 or even 5 times. Compound feed can be fed according to the instructions.

(2) Safety inspection: To prevent fish from escaping, the net cages should be inspected regularly. After a typhoon, check whether the net cages have been damaged or whether any fish have escaped.

(3) Eliminate attachments to the cages. When the cages have been in the sea for a period of time, any fouling organisms that attach to the cages must be removed promptly.

(4) Disease prevention and control. Fish disease is an important factor affecting the survival rate of golden pomfret. Due to the high stocking density of cage culture, once the fish are sick, cross infection will occur quickly and the disease will be difficult to control, which may easily lead to mass death. Prevention is better than cure, and prevention is particularly important. Therefore, prevention work should be done well in normal times, and fish diseases should be treated in time when they are found.

3. What kind of fish is domestic fish?

Domestic fish is not a type of fish, but refers to freshwater fish that are artificially raised and eaten. Nowadays, there are many artificially raised fish species, including crucian carp, bream, silver carp, tilapia, loach, and yellow eel. The popular four major domestic fishes refer to: silver carp (silver carp), bighead carp (bighead carp), black carp (black carp), and grass carp (white carp).

4. Can Haichang fish be farmed? It's the flat fish.

Pomfret, also known as mirror fish, bream (Linhai Yiwuzhi), Changhou turtle, Chang rat (Bencao Shiyi), dog sleepy fish (Lingbiao Luyi), pomfret (Yilin Zongyao), mirror fish, flat fish (Yellow Sea and Bohai Sea fish survey report), Baichang (Chinese Animal Atlas·Fish), fork slice fish (Jiangsu, Zhejiang), etc. It has a short and tall body and is extremely lateral.

Artificial breeding, Haichang

Pomfret, also known as mirror fish, bream (Linhai Yiwuzhi), Changhou turtle, Chang rat (Bencao Shiyi), dog sleepy fish (Lingbiao Luyi), pomfret (Yilin Zongyao), mirror fish, flat fish (Yellow Sea and Bohai Sea fish survey report), Baichang (Chinese Animal Atlas·Fish), fork slice fish (Jiangsu, Zhejiang), etc. It has a short and tall body and is extremely lateral.