Abstract
Studies were conducted to assess the effects of sub-lethal exposure of pesticides endosulfan, chlorpyrifos and malathion for 40 days on freshwater teleost, Cyprinus carpio. Jerky and whirling movements, surfacing, exodus trials, engulfing air, excess mucus secretion and poor response to feed were the commonly observed behavioral changes in the treated fish. A dose dependent reduction in the activity levels of selected dehydrogenase enzymes (glutamate dehyrogenase, succinate dehyrogenase, malate dehyrogenase and pyruvate dehyrogenase) was evident in the muscle tissues of the test animal. A reduction of 30.2 and 70.2 percent in activity levels of succinate dehydrogensae (SDH) was evident in 0.0001 and 0.001 ppm endosulfan treatments, respectively. The combirmtion of pesticides appeared consequently additive in nature. The toxic effects of endosulfan in combination with chlorpyrifos and malathion inhibited the SDH activity to a further low of 71.6 percent. Lactate dehydrogenase activity in the muscle tissue was higher in pesticide-exposed fish in comparison to the control fish.
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