Grass carp can be raised in stagnant pond. Grass carp is a kind of grass carp in Cyprinidae, which is also a typical herbivorous fish. It mainly inhabits the middle and lower layers of water and likes to move in places with more aquatic plants. It is very lively in nature and widely distributed. It is called four major fishes together with herring, silver carp and bighead carp, and is an important freshwater cultured fish in China.

Bighead carp can live in freshwater lakes, ponds and reservoirs, and is also one of the four major fishes. Because it is a filter-feeding fish, it is named as a scavenger in water. This kind of fish is gentle and does not like jumping. It is mainly raised with silver carp in artificial breeding, and the ratio of the two is 1: 3, so as to promote growth.

Catfish is a general name for catfish, which is a fierce fish living under the water. I am afraid of light, so I hide in the Stone seam at the bottom of the river during the day. There are no scales on its body surface, but there is a lot of mucus. It is a carnivorous fish, and it is gluttonous. The hotter the weather, the greater its appetite.

Carp is a kind of bottom fish with miscellaneous feeding habits, which does not require high water quality, so it is no problem to keep it in a stagnant pond. This kind of fish is easy to raise, usually intercropping with other fish, which is responsible for cleaning up the residual bait at the bottom of the water, avoiding the deterioration of water quality, and maintaining the water quality of the pond to a certain extent.

Silver carp, like bighead carp, is also a filter-feeding fish, and belongs to the four major fishes. It is the main freshwater cultured fish in China and distributes in all water systems. It grows fast, does not get sick easily, and has high yield, so it can be raised in stagnant ponds.