Abstract
The acute toxicity tests for 24, 48, 72 and 96 h to the freshwater fish, Labeo rohita were conducted with a cartap hydrochloride (50% SP) commercial grade , chemical structure, S , S ’- (2-dimethylamino-trimethylene) bis (thiocarbamate) a carbamate systemic insecticide, to both static and continuous flow-through methods. The LC 50 values obtained were 0.4152, 0.4053, 0.3948 and 0.3851ppm respectively for 24, 48, 72 and 96 h for static, 0.3132, 0.2964, 0.2821 and 0.2732 ppm respectively for continuous flow-through method. The fish exposed to chemical showed erratic swimming, loss of balance, surfacing and convulsions in a dose dependent manner. Cartap was reported as moderately toxic to freshwater fish, Labeo rohita and producing altered behavioral pattern in dose dependent manner. These changes were in agreement with the earlier reports. The results obtained in all were discussed with the available literature. The Regression values and the 95% confidence limits of the LC 50 values for each test were also calculated for different time periods by using Statistical Package for the Social Sciences (SPSS) software.
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