With the rapid development of aquaculture industry and the improvement of production and economic benefits, water pollution, eutrophication and other negative effects have been brought, resulting in the continuous occurrence of fish diseases. Alkalinity is an important parameter affecting water environment. The alkalinity level in the water can affect the breeding objects by changing the existing forms of some substances in the water, and also affect the efficiency of autotrophic nitrification, heterotrophic denitrification and heterotrophic assimilation of ammonia nitrogen in the water. Fish farming water needs certain alkalinity, but too high alkalinity is harmful. Therefore, better control of alkalinity can obtain greater economic benefits.<br>
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