PYRETHROID INDUCED RESPIRATORY CHANGES IN LABEO ROHITA

摘要

The acute (96 hrs) effects on exposure to sublethal and lethal concentrations of synthetic pyrethroids, fenvalerate 20 EC and cypermethrin 25 EC were studied by a static bioassay method on the fingerlings of a freshwater carp, Labeo rohita. The sublethal concentrations of fenvalerate and cypermethrin were 2.7 ppb and 3 ppb while lethal concentrations were 4.8 ppb and 5 ppb respectively. The rate of oxygen consumption was determined at these concentrations after every 24 hours. It was found that, as compared to the control, there was change in the rate of oxygen consumption. In general, there was increase in the rate of oxygen consumption due to the effect of both the pyrethroids.