With the improvement of living standards, the demand is increasing for fish and other seafood, which has resulted in widespread overfishing in wild fisheries. As of 2016, more than 50% of seafood was produced by aquaculture. Therefore, High-density and low-cost aquarium farming emerged, fish ponds are the principal form of aquaculture. Worldwide, the most important fish species produced in fish farming are basses, carp, tilapia, salmon, and catfish.
Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity.Yinglong round culture tank design and management techniques being employed to lower system costs and achieve increased productivity.
Large cost savings have been achieved in the production of food fish with the use of larger systems and enhanced production management strategies. These trends have also included the use of large circular culture tanks because of their many advantages for food fish production. Circular tanks make good culture vessels because they can provide a uniform culture environment, can be operated under a wide range of rotational velocities to optimize fish health and condition, and can be used to rapidly concentrate and remove settleable solids. The flow inlet and outlet structures and fish grading and/or removal mechanisms should be engineered to reduce the labor requirements of handling fish and to obtain effective tank rotational characteristics, mixing, and solids flushing.