The freshwater fish Puntius ticto was exposed to lethal (5.012 ppm) and sublethal (2.506 and 1.253 ppm) concentrations of dimethoate for 96 h and 60 days, respectively. Biochemical changes in the gills were analyzed after exposure period. Exposure of fish to lethal and two sublethal concentration of dimethoate showed decreased in the protein content in the gills after 60 days exposure. As compared to lethal exposure, significant change in the protein content was observed during the sublethal exposure. Glycogen, cholesterol and ascorbic acid contents in the gills also decreased after exposure.
Key words: Lethal and sublethal toxicity, dimethoate, Puntius ticto, biochemical changes.
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