The continuous rainstorm has caused great harm to the cultivation of river crabs. The weather is sultry after the rain, and river crabs are prone to stress, illness and death. Farmers must establish confidence, attach importance to and strengthen post-disaster management, and minimize the losses caused by floods. After the meiyu, it is necessary to quickly put into post-disaster production, and timely inspect and repair key fishing facilities such as ponds, electricity and escape prevention. In aquaculture ponds where crabs escape less, the following points should be noted:

1, reducing stress response. After the rain, the temperature rises, the aquatic plants rot, and the water environment in the pond changes suddenly, so the river crab is prone to stress reaction. We can use anti-stress preparations and oral multivitamins or traditional Chinese medicine preparations to reduce stress and enhance the physique of river crabs.

2. Prevent the lack of oxygen in the pool water. Start the aerator scientifically, promote the convection and aeration of water, maintain sufficient dissolved oxygen in water, relieve the stress of river crabs and enhance appetite. When the weather is bad, throw less or no feed to reduce the pool? Organic matter accumulation and ingestion reduced the activity of Eriocheir sinensis.

3. Prevent the deterioration of the pool water. Reduce the water level, adjust the water level to normal PH value in time, disinfect the whole pond, spray beneficial microbial agents to adjust the bottom of the pond, purify the water, accelerate the decomposition of pollutants, and keep the water fresh. After the water level drops, the floating aquatic plants in the pond should be fished out in time to prevent rot and deterioration, and the preparation of strong roots and grass protection should be used to promote the growth of aquatic plants.

4. Prevent the outbreak of epidemic diseases. After the plum rain, the pool water changed suddenly and the rainstorm eroded, which caused the crab to be injured, weak and easily infected. Therefore, it is necessary to disinfect and sterilize in time, transfer water to improve the bottom, stabilize the algae phase and prevent the outbreak of bacterial diseases.

5. Pay attention to feeding management. After the plum rain, it is suggested that fresh small fish should be fed with high-quality puffed granular materials, and the feeding amount should adhere to no residual materials and fresh bait the next day. 0.5% allicin can be added to feed to prevent diseases. If possible, fresh snails can be added, which is not easy to pollute the pool water. When feeding, we must adhere to the "four looks" to see the water quality, water temperature, weather, activities and? "Four decisions", pay attention to reducing the daily feeding amount in the early stage, and feed normally after the pool water is stable.