1 herring

Black carp is a kind of medium and large fish in CYPRINIDAE, and it often moves in the middle and lower layers of water, mainly feeding on aquatic animals such as snails, clams, clams and so on.

2. Silver carp

Silver carp is a fish of CYPRINIDAE and Silver Carp, which mainly moves in the upper layer of water. This kind of fish is lively and good at jumping, and often jumps out of the water, especially in summer. But it is not active in winter and often overwinters in deep water.

3. Bighead carp

Bighead carp is also called silver carp, which is called "male fish" in my hometown. This kind of fish looks very similar to silver carp, but its head is much bigger, so it is also called chubby fish and bighead fish.

4. Grass carp

Grass carp (Ctenopharyngodon idellus) belongs to CYPRINIDAE and Ctenopharyngodon idellus, and generally prefers to live in the middle and lower layers of water and in the coastal areas with many aquatic plants. This kind of fish is also very lively, swims quickly, and likes to come out in groups to feed, and it is fierce to grab food when feeding.

living environment

Silver carp: In the upper waters, it feeds on phytoplankton such as diatoms and green algae.

Bighead carp: It lives in the middle and upper waters and feeds on zooplankton such as Daphnia.

Black herring: It lives in the middle and lower waters and mainly feeds on benthic animals such as snails, mussels and small mussels.

Grass carp: it lives in the middle and lower waters and on the banks with many aquatic plants, and mainly feeds on aquatic plants and reeds.

In the Northern Song Dynasty, the four major fish continued to develop into a wider regional culture, and the culture in the Yangtze River and Pearl River gradually flourished. According to the careful (1232 ~1298) records in Guixin Magazine, the capture, transportation, screening and sale of the fry of the four major fish have reached a professional level.

Moreover, the mixed culture technology of four major fish was produced in the Song Dynasty and quickly popularized. Polyculture technology not only makes full use of aquaculture resources, but also enriches the product structure of fish farmers and reduces the risk of production.