The profit of circulating water culture tanks is very high. The circulating water culture tank can reuse water, reducing the cost of water use, and at the same time, using natural light, reducing energy consumption and labor costs. It can realize intensive farming, improve farming density and efficiency, and reduce land use cost and labor cost. With the improvement of people's living standards, the demand for high-quality, healthy and safe aquatic products is increasing day by day, and the aquatic products produced by circulating culture vats can meet the market demand. The use of water circulation system can reduce water pollution and wastewater discharge, meet the requirements of sustainable development, and get government support and preferential policies, so the profit of circulating aquaculture tanks can be high.