Abstract:

This study was conducted to investigate the effects of different level of dietary Cd on antioxidant capacity of hepatopancreas to tilapia. 300 fish were divided into five groups, which were exposed to dietary Cd at concentrations of 0, 50, 100, 200, 400 mg/kg for 8 weeks, with four replicates in each group. The results showed that with the level of dietary Cd increase, the content of MDA was increased, which was higher than the control group in 200 mg/kg Cd group significantly (P<0.05); the level of T-AOC was decreased with the level of dietary Cd, which was lower than the control group in 50 mg/kg Cd group significantly (P<0.05). With the level of dietary Cd increase, the activities of CAT and SOD were firstly increased and then decreased, and showed the highest activities in 50, 200 mg/kg respectively. It suggested that different level of dietary Cd had different toxicities in hepatopancreas antioxidant indices of tilapia. T-AOC of tilapia hepatopancreas could be decreased significantly when the level of dietary Cd was 50 mg/kg, and the activity of CAT was the highest among all groups. MDA of tilapia hepatopancreas could be increased significantly when the level of dietary Cd was 200 mg/kg, and the activity of SOD was the highest among all groups.