| Summary: | As the use of pesticides reached massive proportion, a darker side of these toxic chemicals revealed itself. Carried by natural forces such as wind, rain and the flow of rivers and ocean currents, residues of organochlorines being to appear everywhere on the globe, from tropical forests to Antarctic snows. Worse still, the slowly decomposing chemicals were talking their toll among many non–target fish and wildlife species. It becomes clear from the residue found in the bodies of dead or dying birds, that pesticides were directly responsible for their deaths. The direct kills were very stunning and at the gradual build-up of organochlorines in fish and wildlife tissues was another unforeseen consequence that posed an even greater long–term threat. Organochlorines residues persist in the environment for years after their application has ceased. Because of their stability, as well as other chemical properties, they accumulate at high concentration in the bodies of animals at the top of some ecological food chains. Present research paper pointing out the effect of Endosulfan on Hear beat of fresh water crab Barytelphusa guerini by analyzing statically data with graphically.
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