[Effects of heavy metal ions on SOD activity of Litopenaeus vannamei hepatopancreas, gill and blood].
ABSTRACT This paper studied the effects of Cu2+ , Zn2+ and Cd2+ on the superoxide dismutase (SOD) activity of Litopenaeus vannamnei hepatopancreas, gill and blood. The results showed that the SOD activity changed significantly with prolonged exposure of these ions (P < 0.05). The SOD activity of all test objectives changed with a single peak under the exposure of 0.1 - 1 mg Cu2+ x L(-1), that of hepatopancreas and of hepatopancreas and gills was inhibited obviously under 10 mg Zn2+ x L(-1) and 0.5 mg Cd2+ x L(-1), respectively, while 0.25 mg Cd2+ x L(-1) had no significant effect on that of gill. The SOD activity of hepatopancreas, gill and blood all increased first and then decreased under the prolonged exposure of < 10 mg Zn2+ x L(-1) and < 0.25 mg Cd2+ x L(-1). There was an obvious dose-time response relationship between test metal ions and SOD activity. The SOD activity was decreased in order of hepatopancreas > gill > blood, while the toxicity of test metal ions was in order of Cd2+ > Cu2+ > Zn2+.