Abstract: In order to improve the survival rate and quality of freshwater fish fry, the recirculating aquaculture system （RAS） was planned, designed and constructed in combination with the characteristics of freshwater aquaculture. Taking Pelteobagrus fulvidraco as an example, the application of the system in the breeding of fish fry was studied. During the breeding of Pelteobagrus fulvidraco fry, the water temperature was always maintained at 28~29 ℃, and the water quality parameters were relatively stable. The dissolved oxygen （DO） was 5.0~7.0 mg/L, and the pH was 7.5~8.5. After 16 days of cultivation, the total length of the juvenile fish was about 2.5 cm, the weight was about 0.14 g, and the survival rate was more than 80%. In addition, the circulating aquaculture system used heat pump operation, which could save cost compared with the cost of coal combustion, and effectively the operating cost. To sum up, the mode of RAS not only improved the survival rate of Pelteobagrus fulvidraco fry, but also reduced labor costs and realized energy conservation and emission reduction.

Key words: Pelteobagrus fulvidraco, recirculating aquaculture system （RAS）, growth, energy saving