In the process of crab cultivation, due to the large amount of feeding in the crab pond, the residual feed and the excrement of the river crab are decomposed, and the original fertility of the pool bottom soil is slowly released to the pool water to make the pond water over-fertilized. Some crab farmers saw that the water quality in the crab pond became fat and they quickly changed water to prevent unexpected events. Some stress reactions often occurred. The demonstration households of Wang Baozhen, Qidong City, Yang Weidong farmed more than 10 acres of crabs. High yield, no disease. According to Yang Weidong, many crab-rearing farmers currently adopt the method of entering and draining water to adjust the fatness of the crab pool. This is not the best solution because too much water is drained into the water. This means that electricity is wasted and costs are increased. The loss of active components in the water makes the pool less fertile and reduces the amount of phytoplankton and zooplankton in the pond and affects the growth of river crabs. Third, the water level is indefinite, and the crab caves change frequently. Some crabs do not eat or eat as they migrate above the water surface. Shell, the formation of "lazy crabs"; Fourth, the water into the drainage of a slight negligence can easily lead to crab escape, thereby affecting the output of deduction crab. But what kind of methods will be used to regulate the control of water quality? Yang Weidong mainly adopts the following methods: (1) Planting aquatic plants such as water peanuts. Floating aquatic plants, such as big and small leaf duckweed, can absorb the fertility of water bodies, control the phytoplankton mass reproduction, and provide habitats, clam shells and hidden places for dungling crabs, as well as vegetable feeds and deductions. Crab grows and reduces the cost of farming. The area of ​​aquatic plants accounts for about 80% of the total pond area. (2) The use of biological bacteria to improve water quality, the use of biological bacteria can increase dissolved oxygen in the water, generally once every 7 to 10 days, the amount of 0.5 kg/mu.
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