Carp is native to Asia, likes to move alone or in small groups, and usually inhabits calm ponds, rivers and lakes with overgrown aquatic plants. It is a benthic omnivorous fish, which can eat meat and vegetarian food, and has a wide range of adaptation to temperature. In addition, as a stomach-free fish species, its metabolism is very fast, so it needs to be fed a small amount of times.

Grass carp is a common herbivorous fish, which usually inhabits rivers and lakes in plains, mostly moves in the middle and lower layers of water bodies, and is active in nature. It mainly eats algae and larvae during the juvenile fish period, and also eats meat such as earthworms and dragonflies after adult fish. In the reproductive season, it also has the habit of swimming backwards.

Herring and grass carp belong to the four big fishes, but the difference is that this kind of fish is inactive in temperament and prefers meat, and likes to eat snails, clams and clams. It has a wide distribution range and strong adaptability to temperature. When the temperature is between 20-32 ℃, its growth speed is the fastest.

Bream is also called Megalobrama amblycephala or Wuchang fish, which is about 40 cm long and likes to live in still water. It is mainly distributed in lakes in the middle and lower reaches of the Yangtze River, and its own growth speed is fast, and its adaptability is strong, and its feeding habits are relatively wide. Because of its fresh meat and delicious taste, it has become the main freshwater cultured fish in China.

The cocked-billed fish is also called the cocked-billed red catfish. It is a large freshwater economic fish in the middle and upper layers, and it moves very fast and is very good at jumping. It is irritable, easy to be frightened, grows very fast, feeds on live fish, belongs to carnivorous fish, and has high economic value.