Grass carp belongs to the genus Grass carp in the subfamily Yarrowiaceae of the order Cypriniformes. Common names of grass carp include: grass carp, grass carp, oil grass carp, grass carp, white grass carp, grass carp, grass root, thick fish, sea grass carp, mixed, black mackerel and so on.

The body is slightly cylindrical, the head is slightly flattened, the tail is laterally flattened; the mouth is curved, beardless; the upper jaw is slightly longer than the lower jaw; the body is light teal, the back is greenish-gray, the abdomen is grayish-white, the pectoral and ventral fins are slightly grayish-yellow, and the other fins are light gray its body is longer, and the abdomen is not angular.

The head is flat and the tail is laterally compressed. The lower pharyngeal teeth are in two rows, laterally compressed, comb-shaped, with transverse grooves on the side of the teeth. Dorsal and anal fins without spines, dorsal and ventral fins opposite. The muzzle is very short, less than or equal to the diameter of the eye. The postorbital length is more than half the head length.

Inhabits rivers and lakes in the plains, preferring the lower and middle water and nearshore areas with lots of water plants.

Expanded Information:

. p>Ecological habits

The grass carp prefers to live in the middle and lower layers of rivers, lakes and other waters and inshore areas with many aquatic plants. It has the habit of migrating between rivers and lakes. Sexually mature individuals spawn in rivers, reservoirs and other flowing waters, and after spawning, the parents and juveniles enter the tributaries and lakes;

Fattening in the flooded shallow meadows and flooded areas, as well as in the subsidiary bodies of dry and tributary waters. In winter, they overwinter in deep water in dry streams or lakes. Grass carp are lively, swim quickly, often forage in groups, and are voracious eaters, making them typical herbivorous fish.

It is a typical herbivorous fish.

It feeds on zooplankton at the fry stage and insects, earthworms, algae and duckweed at the juvenile stage, etc. It feeds on aquatic plants when its body length reaches about 10 centimeters or more, which is especially high in graminaceous plants.