Effects of different concentrations of ozone on water quality and production performance of Trionyx sinensis

The aquatic water of Trionyx sinensis was treated by different concentrations of ozone， at（27 ±1） ℃， the water quality was detected， and the growth and survival rate of T. sinensis was observed. The results showed that， by different concentrations of ozone， the contents of NO 2 -N and NH 4 -N in aquaculture water significantly decreased， and the dissolved oxygen（DO）content increased. After 21 days， in aquatic water treated with 0.1 mg/L ozone， the average weight of T. sinensis was 17.5（±0.16）g， the survival rate reached 91.33%， the effect was obvious.