Effects of Boscalid on the Antioxidant Enzyme System of Adult Zebrafish(Danio rerio)

Objective] This study was conducted to evaluate the ecotoxicity of boscalid to adult zebrafish(Danio rerio). Method]The activities of antioxidant enzymes superoxide dismutase(SOD), catalase(CAT), peroxidase(POD), glutathione peroxidase(GPx), as well as a non-enzymatic antioxidant malondialdehyde(MDA), in the liver were measured 3, 7, 14 and 21 d post exposure(dpe) to 0.02(1/100 of acute toxicity), 0.036(monitored concentration), 0.08(1/20 of acute toxicity), 0.16(1/10 of acute toxicity) and 0.32 mg/L(1/5 of acute toxicity) boscalid using a semi-static method. Result] SOD, CAT, POD, GPx and MDA activity in the liver of zebrafish varied with boscalid concentration and exposure time. Boscalid significantly enhanced MDA content at 21 dpe. A significant upregulation of the activity of SOD, CAT, POD and GPx at 7 dpe was observed, suggesting that boscalid resulted in oxidative stress and lipid peroxidation. Conclusion] These results show that these biomarkers are all appropriate for monitoring oxidative stress and the lipid peroxidation status of fish after exposure to boscalid.