How to prevent the development of small green crab?

(1) To prevent excessive accumulated temperature

Artificial breeding crabs should be kept as close to natural crabs as possible, and should not be earlier than May as early as possible. Increase the depth of crab pools. In summer and autumn, the depth of crab pool should be maintained at 1.2 to 1.5 meters to prevent excessive water temperature; Submerged plants are planted in the pond to reduce the pond water temperature.

(2) Preventing excess nutrients

Increase the stocking density of juvenile crabs, increase the stocking density of Phase III juvenile crabs from 10,000 to 20,000/mu to 50,000 to 80,000/mu; pre-promoting post-control, in the early period of juvenile crab breeding, Feed some animal diets and concentrates to prevent lazy crabs. In the middle and later seasons, plant-based diets should be used. If medium-term juvenile crabs are found to grow too fast, they should be given less or not even fodder. The juvenile crabs should use the aquatic plants planted in the pond to feed on them; control the number of water additions, and generally add water once every half-month during the feeding period.

(3) Poor environmental conditions and high salinity

Fresh water and salt water were introduced to improve the water quality of ponds; the management of crab species was changed; the sale of Phase III pond crabs was mainly for saline-alkaline ponds, supplemented by the cultivation of first-instar crabs.

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