Abstract
In this study, some biochemical responses of Cyfluthrin (CFT), a commercial insecticide in Dreissena polymorpha, were investigated. The 96 hour LC50 value of CFT on D. polymorpha was calculated as 553.22 ± 27.3 µg / L. D. polymorpha was exposed to subletal concentrations (1/20, 1/10 and 1/5 of LC50 value) of CFT for 24 and 96 hours. The enzyme activities of superoxide dismustase (SOD), catalase (CAT) and glutathione peroxidase (GPx) were determined in D. polymorpha individuals. In D. polymorpha exposed to CFT, SOD activity increased compared to control. It was determined that CAT and GPx activities were inhibited compared to the control.
 As a result, D. polymorpha individuals exposed to CFT were found to cause increased oxidative damage.
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