Application of floating bead biofilter in recirculating sturgeon culture system

The present paper described the application of floating bead biofilter in recirculating sturgeon culture system. In a recirculating system of 120 m 3 water and 19kg/m 3 sturgeon culture density, we utilized a set of BAF-40 two-layer floating bead biofilter with 4kW power and 40 T/h to treat the culture water for reuse. During culture period, pH, DO, COD, SS, ammonia, nitrite, nitrate and so on were analyzed and the length and weight of culture sturgeon were measured. The result shown that if water recycle was 3 hours and water exchange period was a week, the water quality was good and COD≤15mg/l, ammonia≤1mg/l, nitrite≤0.13mg/l, nitrate≤24mg/l. After 12 months culture, culture fish survival rate was 98% and gained 10 times weight growth. The Floating bead biofilter can be successfully used in recirculating sturgeon culture system to meet the sturgeon culture need of water and biology.