Author(s): A Rajeswari, G Sravani and K Sunita

Abstract: The toxic effects may include both lethal and sublethal concentrations, which may change the growth rate, development, reproduction, histopathology, biochemistry, physiology and behavior non target organisms and undesirable perturbations in the environment. The result of the present work i.e., observed percentage mortality of species of freshwater fish Cirrhinus mrigala when exposed to the Glyphosate (41%SL.) time periods 24, 48, 72 and 96 h in static system toxicity is in the range of 3.757 mg/L, 3.461 mg/L, 3.15 mg/L and 3.043 mg/L, respectively. In the present investigation, the test species Cirrhinus mrigala has shown differential toxicity level with a function of period. With the increase period of exposure (96 h), the fish showed mortality at less concentration and with decrease of duration of exposure the fish exhibited mortality at higher concentration. When fish were exposed to sublethal concentration of Glyphosate for 96 h. several behavioural changes were observed which include loss of schooling behaviour, swimming near the water surface, hyper activity, erratic movements, elevated cough, restlessness before death, darting movements and hitting against the walls of test tanks were noticed in the fish tested. A film of mucus was also observed all over the body and also on the gills.

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