Evaluation of the Acute Toxicity of Cypermethrin and its Effect on Behavioral Responses of Caspian Roach (Rutilus rutilus caspicus) and Silver Carp (Hypophthalmicthys molitrix)

Abstract

The acute toxicity of cypermethrin to Caspian roach (Rutilus rutilus caspicus) and silver carp (Hypophthalmicthys molitrix) was assessed in a static non-renewal bioassay method for 96 h. Groups of seven silver carp and Caspian roach in three replicates were exposed to the technical grade of cypermethrin (0, 0.01, 0.5, 2, 4, 8 and 16 µg L ). Data obtained from the cypermethrin acute toxicity tests were evaluated using 1 roach were estimated at 2.314, 1.023, 0.732 and 0.627 µg L , respectively. The LC for 24, 48, 72 and 96 h for 1 50 the silver carp were 2.962, 1.653, 1.030 and 0.917 µg L , respectively. At various concentrations of cypermethrin 1 (0.5-16 µg L ), fish showed abnormal behavioral responses (rapid gill movement, nervous manifestations, 1