1, the stocking density of cages should be determined according to the culture mode, that is, feeding or not, and referring to the fish productivity of cages.

The environment in the cage is stable, and the water body is large, which is closer to nature; Fish has a wide range of activities, high survival rate, fast growth, less fish diseases and easy recovery; Natural bait is more and bait is less; The body shape and meat quality of farmed fish are close to those in the wild.

2. Fish culture in natural bait cages is mainly silver carp and bighead carp, and a small amount of fish is scraped to clean the cages. The selection of cage is very important, which is directly related to the effect of freshwater cage culture. The cage is made of 2×3 or 3×3 polyethylene net, which is about 6 m× 4 m× 5 m. The cage has a double-layer structure with a water depth of 5 m, an inner net of 4cm and an outer net of 5 cm. With wooden frame or steel frame as the main structure, the float is made of iron oil bucket or plastic bucket, and the bottom of the box is made of cement and fixed with anchor cable.

3. Cage stocking can save the land and labor needed to dig fish ponds, and the investment is quick. Fish culture in plastic cages can make full use of natural waters such as large water surface, deep puddles and deep depressions, and can also use natural bait or artificially feed fish or fingerlings for feeding.