The scientific name of the multi-scale white turtle: Onychostoma macrolepis, a freshwater fish of the genus Cyprinidae, is one of the important economic fishes in the rivers of southern China. It is named after the large and closely arranged body scales. It is mainly distributed in the middle and upper reaches of the Yangtze River in China (such as Jinsha River, Minjiang River and Jialing River), the upper reaches of the Pearl River (Xijiang River and Beijiang River) and the Lancang River Basin; it is only found in the Red River Basin in northern Vietnam. It inhabits mountain rivers at an altitude of 300-1500 meters, prefers clear waters with turbulent currents and gravel or sandy bottom, and often clusters in the middle and lower levels.

Carp (scientific name: Cyprinus carpio, Cyprinidae) is one of the most widely distributed and economically valuable freshwater fishes in the Cyprinidae. It is widely distributed in rivers, lakes and reservoirs in Eurasia. It has been domesticated by humans for more than 2000 years because of its strong adaptability and high fecundity, and is known as "the cornerstone of freshwater culture". Eurasia temperate to tropical freshwater basins, such as the Yellow River, Yangtze River, Volga River, Danube River. Freshwater ecosystems in North America, Australia and other places, some species become invasive species (such as koi flooding in North America).

It is a freshwater fish widely distributed in Eurasia, belonging to the Cyprinidae family, and is a very common species in fishing and aquaculture. Strong adaptability, able to survive in various water quality environments. The body size varies from small to large, usually olive green or yellow brown in color, with irregular dark spots or stripes on top. The body is streamlined, covered with smooth scales, the head is relatively rounded, and the mouth has tentacles, which are helpful for foraging underwater. It is an omnivorous animal that feeds on aquatic plants, insects, small crustaceans, and other aquatic animals. When foraging underwater, tentacles are used to detect food.