Abstract

The present investigation was conducted to evaluate the lethality of cypermethrin “pyrethroid” (25% EC with 100% purity) on common carp, Cyprinus carpio (fingerlings). The effect was assessed on the basis of impact of short term exposures of its below safe concentrations (1/2 (0.05 µl/L) and 1/10 (0.01 µl/L) parts of safe concentration) on some hematological parameters. The sub-lethal exposure studies were done on the same day and after 7 days of exposure. Hematological recovery was also studied by maintaining the pesticide-exposed fish in a fresh water system for an additional 7 days. The hematological analysis showed significant reduction in red blood cells (RBCs) count and hemoglobin (Hb) value while total white blood cells (WBCs) count were significantly increased in the fish C. carpio. Complete recovery was obtained in all the parameters after a recovery period of 7 days.

Key words: Cypermethrin, Cyprinus carpio, hematology, recovery.