Toxic Effect of Synthetic Pyrithroid Pesticide (Cypermethrin) and an Organo Phospate Pesticide (Chlorpyrifos) on Certain Parameters of fresh water Carp Fish Labeo rohita

Abstract

Aquatic ecosystems are vulnerable to the detrimental effects of various
agrochemicals, including synthetic pyrethroids and organophosphates. In this
study, we investigated the toxicity of cypermethrin and chlorpyrifos on a
commonly found freshwater fish species Labeo rohita,. The fish Labeo rohita were
treated for acute toxicity with cypermethrin and chlorpyrifos, separately and in
combination for 7 days with 1/10th of the LC50 dosage for individual treatment
(0.015ppm and 0.042ppm respectively) and 1/20th of the LC50 of cypermethrin and
chlorpyrifos for combined treatment (i.e., 0.0075ppm and 0.021ppm respectively).
Individual and combined treatment resulted in a significant (p<0.05) change in
glucogen, proteins and lipid contents in muscle, liver and kidney tissues were
recorded. Muscle shows the greatest loss of protein followed by liver and kidney.
Liver shows significant reduction of lipid and glycogen in comparison with other
selected tissues of the experimental fish species. The changes were greater in
combination than individual treatment, possibly because of a synergistic effect of
cypermethrin and chlorpyrifos