Water quality testing refers to the monitoring and evaluation of the internal environment of water bodies, mainly including the determination of various indicators such as carbonate value, pH value, hardness, residual chlorine, nitrite, nitrate, etc. 

Water quality testing plays a very important role in aquaculture. 

Firstly, water quality testing can help aquaculture personnel to timely understand the water quality status and identify problems. Secondly, it can guide farmers to scientifically carry out aquaculture, improve output efficiency, and avoid polluting water bodies. 

Finally, water quality testing can ensure that the products produced are not affected by pollution and ensure the safety of consumers.