Evaluation of Acute Toxicity Levels and Behavioral Changes to the Fry of Common Carp, Cyprinus carpio (Linnaeus, 1758) Under Exposure of a Pyrethroid Insecticide Cypermethrin

Chandan Sarkar; Nimai Chandra Saha

doi:10.37591/rrjols.v8i3.1053

Abstract

Toxicity of an insecticide Cypermethrin to the fry of common carp, Cyprinus carpio along with their behavioural changes was evaluated in the present study. The 24, 48, 72, and 96 h LC50 values of Cypermethrin to the fry of Cyprinus carpio were 1.04, 0.92, 0.89, 0.79 ng/l, respectively. The mortality rate of C. carpio showed significant variation (p < .05) with the increasing concentrations at all exposure times. On the other hand, the mortality rate of C. carpio also varied significantly (p < .05) at all the doses with increasing exposure times (24, 48 and 72, and 96 h). The excess mucous secretion with increasing concentration of toxicant and exposure time was recorded in the exposed fish. The treated fish showed faster movement at lower doses but it was gradually reduced at higher doses at all exposure times. Wide opening of mouth and gills was observed at higher concentrations. Opercular movement of fish initially increases with the increasing concentration but decreases at higher concentrations. Similarly the opercular movement increases significantly (p < .05) with increasing exposure time up to 72h but it decreases significantly (p < .05) at 96h of exposure at all the treatments. Keywords: Behavioral change, cypermethrin, Cyprinus carpio, LC50, opercular movementCite this ArticleChandan Sarkar, Nimai Chandra Saha. Evaluation of Acute Toxicity Levels and Behavioral Changes to the Fry of Common Carp, Cyprinus carpio (Linnaeus, 1758) Under Exposure of a Pyrethroid Insecticide Cypermethrin. Research & Reviews: A Journal of Life Sciences. 2018; 8(3): 102–107p.