Pay attention to the diligent water change, keep the water level stable, water change once a week in the spring, water change once every 3 days in summer, such as in the case of sustained high temperature, should adhere to the water change every day, the autumn weather is hot, and often appear sultry weather, the quality of the water is easy to deteriorate, we should pay special attention to the water change, change the water every 2 days, the amount of water change accounted for the entire area of the water 1 / 3. River crabs are not tolerant of fertilizer, in order to control the fertilization of the water quality, every mu put 200-300 catties two fish species and plant a cause of aquatic plants around the paddy field crab pond. In order to control the fertilization of water quality, put 200-300 tails of silver carp and plant aquatic plants around the crab pool. Different seasons of crab ponds have different requirements for water level, in order to improve water temperature in spring and promote the growth of river crabs, the water level can be controlled at 0.5-0.7m, summer and fall seasons with high water temperature, the depth of the pool water should be maintained at 1-1.5m. anti-escape: special duty patrol dyke, especially when it rains and change more attention. Pond patrol: Observe the water color, pay attention to the crab's activities, do not hurt the river crab, and maintain the stability of the water environment. In the gonad development plump price is appropriate when you can drain the pond water to pick up.