Abstract
Water pollution has been increasing at an alarming rate due to indiscriminate use of pesticides (PINKOVSKI 1972). Organophosphorus pesticides are widely used since they are biodegradable and seldom leave residues but for a short time (BOOKHOUT & MONROE 1977). Much work has been conducted by earlier workers on the metabolism and biodegradation of pesticides in different animals (O'BRIEN et al. 1961; HULLINGWORTH et al. 1967; CAPPON & NICHOLAS 1975). In the present investigation, the changes in the carbohydrate metabolism in selected tissues of freshwater mussel were studied during induced toxicity of phosphamidon, an organophosphorus pesticide. These mussels are not only indicators of local pesticide distribution, because they do'not migrate extensively within or from their native stream, but also as filter feeders, they are exposed to particulate components and can sorb toxic materials as well as dissolved substances in water (CHAISEMARTIN 1977). Apart from this, these mussels have some economic value, since they are consumed by some poor people in certain areas of south India.
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