P.G. Department of Zoology, B.N.Mandal University, Madhepura, Bihar, India
Received : 10th May, 2020 ; Revised :12th June, 2020
Abstract- In the present study, during bio-assay tests, the percent mortality decreased and survival of the fish (Cirrhinus mrigala) decreased with an increase in the concentration of both the pesticides i.e. Sevin & Furadan (Carbofuran) as the fish exposed to lowest concentration of both pesticides showed a comparatively less reaction than that of the fish exposed to higher concentrations, while in highest concentration of both pesticides, rapid rate of mortality observed during the present study, might be due to their hyper-activeness and/or due to injury in some vital organs or due to some metabolic changes in the fish. The fish exposed to different concentrations of both pesticides showed abnormal behaviour depended on the concentration & exposure periods as hyper activeness & restlessness, vigorous swimming on the water surface, trying to jump out loss of equilibrium, uncoordinated movements followed by abnormal posture & swimming on one side, coma followed by mucus formation & death.