1. Breeding conditions. Brittle culture of grass carp can be carried out in ponds or cages. Pond requirements: the bottom of the pond has less silt, sufficient water, good water quality, no pollution, convenient water intake and drainage, with an area of1330 ~ 2000m2 and a water depth of about 2m. Before stocking, the pond should be thoroughly cleaned according to routine requirements. Cages can be set in the leeward and sunny places of lakes, reservoirs and rivers. Water quality requirements: no pollution, rich dissolved oxygen, water depth of 4 ~ 7 meters, flat bottom, no aquatic plants. A fully enclosed cage with a size of 5m× 4m× 2.5m and a mesh size of 0.05m is adopted. The bottom of the cage is padded with a 30-mesh gauze as a feeding table to prevent feed loss. The new cage should be watered 7 ~ 10 in advance to soften the box pieces to prevent scratching the fish; Used cages should be cleaned and soaked in 5% quicklime water solution for 30 minutes. 2. Fish socks. Grass carp, which is healthy, harmless and disease-free, with an average tail weight of 0.5 kg, is selected as fish species, and the stocking amount in ponds is 150-250 kg/mu, and that in cages is 15-20 kg/m2. In order to adjust the water quality, 50 ~ 60 silver carp and bighead carp with a body length of 0.13 ~ 0.15m can be kept in each mu of pond, and 1 ~ 2 fish with a body length of 0.13 ~ 0./kloc can be kept in each square meter of cage. It is best to immunize grass carp before stocking. If there are no conditions, fish can be soaked in 4% salt solution for 5 ~ 10 minute.

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