Abstract
The pesticide pollution different classes like organochlorines, organophosphates, carbamates and other newgeneration ones affect the fish oxygen consumption in sublethal concentrations. Respiratory responses tolethal concentrations increase the ventilation volume and symptoms of pesticide intoxication suggestingthat the effect on respiratory surface were high in fish. Hence, in the present study an attempt has beenmade to study the effect of lethal(1.2µg/l) and sub-lethal 1/10(0.12µg/l) LC50 and 96hrs of 50% mortalityconcentrations of Ethion 50% EC an Organophosphate effect on oxygen consumption for 24 h at each 2hours interval to the Indian major carp, Labeo rohita (Hamilton). Oxygen consumption of aquatic animals isa very sensitive physiological process and therefore, alteration in the respiratory activity is considered as anindicator of stress of animals exposed to pesticides. The significant drop in the rate of oxygen consumptionwas observed in the present study in lethal and sub-lethal concentrations.
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