China is one of the countries in the world with more freshwater water surface, freshwater area of about 300 million mu, of which about 7,500 mu of water surface available for fish farming, most of China is located in the temperate zone or subtropical, with a mild climate and abundant rainfall, which is suitable for the growth of fish, and the cultivation of grass, silver carp, bighead carps, green, pangolin, carp, crucian carp, doughnut pomfrets and other excellent fish breeding techniques, so it is the world's freshwater aquaculture is the most developed country today. Therefore, it is the most developed freshwater aquaculture country in the world today, with a leading position in the world in terms of both area and total production of aquaculture. Due to China's vast territory, geography and natural environment are different, fish species in various regions, pattern characteristics, according to the regional classification of climate, the distribution of fish is: Southeast: including Guangdong, Guangxi, Yunnan, Guizhou, Fujian, Taiwan and Hainan Island and other places. These areas mainly grow warmth-loving fish, a wide variety of representative fish are pangolin, curly mouth fish, Chinese Spanish mackerel, Dongpo fish, flower loach fish, wax light long loach, sand loach, flat head loach, climbing rock loach, flat-finned loach, small kissing fish, long-finned catfish, bearded catfish, eel, eel, eel, fighting fish, climbing perch, and so on. The main cultured fish are green, grass, bighead and silver carp, pangolin, pomfret, bearded catfish, tilapia and other southern species. River Plain Area: This includes the middle and lower reaches of the Yangtze River, the lower reaches of the Yellow River and the lower reaches of the Liao River. Here in addition to the river basin, there are many lakes, is the main production area of freshwater fish in China, natural aquatic fish many and famous, there are green, grass, silver carp, bighead carp, carp, carp, catfish, catfish, bream, Gan, group head bream, Wu Anguilla, eel and so on. The silverfish of Taihu Lake and the sturgeon, perch and crabs of the Yangtze River are very productive. The species of fish cultured are green, grass, silver carp, bighead carp, carp, crucian carp, pomfrets, tilapia and some hybrid varieties of carp. North District: Cold-water fish are mainly produced here, and the natural water body is rich in sturgeon, dogfish and chum salmon, such as salmon, dogfish, scented fish, snowfish, anaconda fish, and octopus eel, etc., which are endemic to and representative of the area. In addition to green, grass, silver, bighead, carp, crucian carp and groupers, red trout are also raised in artificial culture. Northwest Plateau Region: It includes Xinjiang, northern Tibet, Inner Mongolia, Qinghai, Gansu, Shaanxi and Shanxi. This is a typical continental climate. Natural water bodies are rich in Chinese bowfin, yellow clawfish, naked carp, etc., and other fish such as striped loach and river loach. The main culture is still the same as everywhere. Nu Lan District: This includes southern Tibet, Sichuan and western Yunnan. Nujiang, Lancang River, Jinsha River, Yarlung Zangbo River flow through here, so that the southeast and northwest plateau area of fish, through the river **** exist here, such as pangasius, Chinese Spanish mackerel, East Slope Fish, flat-finned loach, sand loach, loach, Shu Shu, perch, yellow reparation, snakeheads, the Chinese bowheads, etc., to form a mixture of the southeast and northwest of the fish fauna characteristics. The main culture is still green, grass, silver carp, bighead carp, carp, crucian carp, pomfrets, as well as a large number of breeding in recent years, such as carp hybrids.