Lethal toxicity of insecticide imidacloprid to colored carp, Cyprinus carpio

Lethal toxicity of insecticide imidacloprid against colored carp, Cyprinus carpio was examined. Lethal toxicity test was concentrations of the active ingredient imidacloprid prepared to 800, 400, 200, 100, 50 and 0 mg/l in breeding water. The 50% lethal concentration of 4.5 g average weight of test fish was calculated 170 mg/l. The influence on the tissue was concentrations of the active ingredient imidacloprid prepared to 1,000, 100, 10, 1, 0.1 and 0 mg/l breeding water. Pathological changes were observed in the gill tissue at the concentration of 0.1 mg/l. These findings suggest that imidacloprid possesses the lethal toxicity and the cytoxicity against colored carp.