What are the four major freshwater fish in China?

The four major freshwater fish are the bluegill, grass carp, silver carp and bighead carp.

The bluegill, also called black carp, has larger scales all over its body. The shape is very similar to grass carp, but the scales and fins on the whole body are grayish-black. This is where the name bluegill comes from. The scales are large and thick. Its tail is more slender than that of the grass carp. The dorsal, pectoral, ventral and caudal fins are longer and stiffer than those of the grass carp.

The grass carp has a long, "showy" body that is greenish-yellow in color with a slightly white belly. The scales are large and thick. Its dorsal, pectoral, ventral and caudal fins are smaller and shorter than those of the greenling. It inhabits rivers and lakes in the plains, and prefers to live in the middle and lower layers of water and near-shore areas with lots of water plants.

The silver carp has a laterally compressed, slightly high, fusiform body shape, with a greenish-gray back and white sides and belly. The pectoral fins do not exceed the base of the ventral fins. Each fin is grayish. The head is large. The eyes are positioned very low.

The bighead carp is also called bighead carp, yellow chub, bighead carp, fathead carp, bighead carp, big head carp, black chub, hemp chub, and also called male carp. Bighead carp grows in freshwater lakes, rivers, reservoirs, and ponds. It is mostly distributed in the middle and upper layers of water. It is produced in all major water systems in the eastern plains of China.

Expanded Information:

p>Introduction

Grass carp inhabit the bottom of waters and feed mainly on mollusks such as snails and mussels and aquatic insects. Grass carp prefer to move around the edge of the waters and feed on water plants. Bighead carp inhabits the upper layer of the water and feeds on phytoplankton. Bighead carp also like to move in the upper layer of the water and feed mainly on zooplankton.

From the end of the Yin Dynasty until the Tang Dynasty, the object of fish farming in China had been carp. In the Tang Dynasty, because the emperor's surname Li, Li Carp homophonic, carp symbolizes the royal family, to avoid "carp", can not catch, can not be sold.

In this case, the fishermen were forced to look for new breeding objects, namely green, grass, silver and bighead carp. These four kinds of fish due to food and habitat habits are different, is very suitable for mixed farming in a pond, the breeding benefit is greater, and thus become the traditional fish farming in China.