Lethal concentration (LC50 96h) of the Insecticide Confidor (Imidacloprid) on the Juveniles of the Grass Carp (Ctenopharyngodon idella)

Grass carp (Ctenopharyngodon idella) in Iran, lives in the Caspian Sea basin and Hamoon Lake in Sistan-Baluchistan Province. Propagation and breeding of these fish are economically justified with the value of the fisheries. Today, this fish is used for avoiding severe growing plants in water channels or natural ponds and their reproduction and breeding it has become commonplace. In this study, the lethal concentration (LC5096h) of the insecticide Confidor (Imidacloprid) was estimated for the Juveniles of the Grass Carp (Ctenopharyngodon idella). For 96 hours, 150 young grass carps (3-4gr.) in 5 groups (1 control and 4 replicates) were treated with the Insecticide Confidor (Imidacloprid) in concentrations 0, 125, 250, 500 and 1000 mg/l and the Lethal concentration (LC5096h) and the maximum allowable concentration (M.A.C. value) were estimated. Results showed that the Lethal concentration (LC5096h) of the insecticide Confidor was 300 mg/l and the maximum allowable concentration (M.A.C. value) was 30 mg/l. Results showed that the toxicity of the Insecticide Confidor (Imidacloprid) was “virtually non-toxic” for the Juveniles of the Grass Carp.