Water quality management runs through the whole process of shrimp culture, and the pool water should always be fertile, lively and tender. First, adjust the composition of algae in water to make green algae or diatoms become the dominant population in water and form a certain number; Second, measure the water quality index regularly, so as to keep the dissolved oxygen content in the pool water above 5mg/L, the transparency at 3O-4O cm, the ph value at 7.5-8.5, and the ammonia nitrogen content below 0.2 mg/L. ..

The following methods can be adopted to adjust the water quality of the freshwater shrimp pond: (1) Spraying microecological agents such as photosynthetic bacteria, Bacillus subtilis, Bacillus, etc. all over the pond, and mixing live bacterial agents into the feed to decompose the organic matter in the pond in time, improve the bottom material and purify the water quality. ⑵ Using water quality improvers, such as zeolite powder and activated carbon, can better absorb harmful substances such as ammonia nitrogen, nitrite and hydrogen sulfide in aquaculture water and reduce the harm of water quality deterioration to freshwater shrimp. ⑶ Adding water or changing water reasonably, it is best to directly drain the bad water and inject fresh water, but attention should be paid to prevent the stress reaction of shrimp caused by the rapid change of aquaculture water environment caused by a large amount of water injection. ⑷ Applying biological fishery fertilizer, such as Yilong Ⅱ fertilizer, can not only enrich water body and promote shrimp growth, but also improve water quality, reduce diseases and effectively avoid floods. 5] If conditions permit, microporous pipe aeration technology can be used to aerate the pond by using the aeration pipe laid at the bottom of the pond to meet the demand of dissolved oxygen in the pond water. The principle of action is that air is pumped into the pond water body through the oxygen filling pipe by the roots blower, and the bubbles burst, dispersing oxygen into the water, so as to achieve the effect of increasing oxygen.