China's common freshwater fish species are:

Grass carp, bream, bream, red-eye trout, bighead carp, carp, crucian carp, flower, McFish, Dachshund's Snake, silver catfish, striped bass, stickleback, eel, eel, loach, loach, catfish, snakeheads, mandarin fish, Gan, warble mouth bleak, Mongolian bleak, bluefish, Asian huqua fish, the northern loach, the Heilongjiang Duwuwenhua, heterochromatic Duwuwenhua, Cherubus, Fine scaled fish, Ussuri whitefish, Arctic fennel, sturgeon, koala, dogfish, hemp hagfish, spotted naked carp, Xinjiang, heavy lip angle, Chinese saw barbs, white snapper, Porpoise, big sea chub, pangasius, ptarmigan, four whisker plate, straight mouth pangasius, Tang fish, South China carp, and so on.

Broadly speaking, freshwater fish can be called freshwater fish if they can live in freshwater with a salinity of three thousandths of a degree. In a narrower sense, it refers to fish that have only a "juvenile" or "adult" stage in their life history, or that have to spend their entire lives in freshwater. There are more than 26,000 known species of fish in the world, and about 8,600 species of freshwater fish. There are nearly 3,000 species of fish in China, of which more than 1,000 are freshwater fish.

There are about 26,000 kinds of fish known in the world, which is a large group with the most varieties of vertebrates, accounting for about 48.1% of the total number of vertebrates. The vast majority of them live in the ocean, and there are about 8600 species of freshwater fish. China's existing fish nearly 3,000 species, of which there are more than 800 species of freshwater fish.