Published Paper Details:

In present investigation, acute toxicity of the pyrethroid pesticide Bifenthrin was carried out under experimental condition to adult Oreochromis mossambicus (Peters, 1852). The 96 h LC50 with 95% confidence limits of Oreochromis mossambicus is 2.423 (1.981-2.748)�g/l. None of the unexposed control fish died during the bioassay. Mortality rate of the exposed fish to the toxicant significantly (p<0.05) varied over the control at all concentrations during every 24h time interval. Significant relationship (p<0.05) was observed between mortality rate and exposure times (24, 48, 72 and 96 h) at all concentrations. Significant variation was recorded between mortality rate of fish at all the exposure doses at all the exposure times (p<0.01). The exposed fish exhibited abnormal ethological responses depending on dose of bifenthrin and duration of experiment. The opercular movement of the fish increased significantly (p<0.05) over the control with increasing concentration but decreased significantly (p<0.05) with the progress of time of exposure at all concentrations. The bifenthrin-based Marker pesticide was therefore classified as strongly toxic to fish.