China's freshwater fishes are about 800 species. Among them, the carp family has the most genera, there are more than 400 species, accounting for about one-half of all freshwater fish; catfish and loach family genera are not few, the two families *** there are more than 200 species, accounting for about one-quarter of all freshwater fish; other families, such as gobies and tiger, snakeheads, gill family and other families *** there are more than 200 species, accounting for about one-quarter of all freshwater fish. In China's freshwater fish, some species are widely distributed, almost everywhere. Such as grass carp, bream, pomfrets, red-eyed trout (etc.) as the main diet of water plants; silver and bighead carps feeding on plankton; omnivorous carp, crucian carp, etc.; others, such as flowers, wheat fish, Dachshund's snakes, channel catfish, striped bass, sticklebacks, eels, eels, loaches, loaches, catfish, and the common ferocious fish snakeheads, Mandarin fish, Gan, etc.; in addition to the temperament and mild predatory fishes such as bleak, Mongolian bleak and mackerel. In addition to the above national widespread species, there are also many common species in the waters of the region. There are about 90 species of fish in the Heilongjiang River and its tributaries in northeast China, of which about 50 species are of the carp family. Because Heilongjiang is located in the temperate and sub-freezing zone, it produces cold water fish, and the common species of greater economic significance are the Cherokee, Chinook salmon, Ussuri whitefish, Arctic fennel, sturgeon, Dachen koelu, dogfish, and migratory fish, such as the marlin. In addition, there are endemic species in the north, such as Asian smelt, northern loach, Heilongjiang salmon, and miscellaneous salmon. As the geographic location moves southward, there are more and more temperate fish in the rivers, while cold-water fish are gradually decreasing. There are about 70 species of fish in the Liaohe River system, and there are still 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, and there are very few cold-water fishes in the two systems, except for the common green, grass, silver carp, bighead carps, bream, bream, pomfrets, jacks, ruddy trout, cochineal carp and other economically important fishes and endemic species such as the anchovy. The upper reaches of the Yellow River and Yangtze River systems and some rivers of the Northwest Plateau are characterized by special species of fish due to their topography, such as 13 species of the genus Splittail of the carp family and 8 species of the genus Naked Splittail*. Local endemic species include spotted naked carp, Xinjiang heavy-lipped horns, Chinese saw barb and white snapper. The Pearl River system is rich in fish resources, *** about 260 species, in addition to the national wide-spread species, there are some special types of fish, such as the genus Pomfret, big sea chub, etc., endemic to South China, such as pangolin, Jiuoshan fish, four-bearded pan, straight mouth pangolin, Tang fish, South China carp, and so on. Southwest China's plateau rivers, such as the Yarlung Zangbo River, Nujiang, Lancang River, Jinsha River, etc., many sections of fast-flowing water, fish resources in general. Such as the wild pangolin genus of the carp family, the genus Dongpo carp, pangolin genus, etc., the loach family of the flat-finned loach genus, the sand loach genus, the family of the outer mouth of the fishes, etc., which are the same as the species in India, Burma, Vietnam and Thailand. In addition, the genus Schizothoracini, the genus Naked Schizothoracini, and the genus Ba Loach are all the same as the species of the Northwest Plateau