Carp is a kind of freshwater fish that lives in the Yangtze River system in China. It is also called mullet or mullet. This kind of fish is rich in meat, delicious and nutritious, containing 22% protein, and has no fine bones. Its fish eggs can be used to make caviar, which is famous at home and abroad. In animal taxonomy, mullet belongs to ichthyidae, Perciformes, and it is widely distributed in all parts of China except the western plateau. Mullet has the characteristics of fast growth, strong adaptability and disease resistance, wide source of fry and fast reproduction, and has high breeding value.