Author(s): Sneha Verma and Anurag Rawat

Abstract: Organophosphorus pesticides are used in the agricultural area due to their rapid biodegradability and non-persistent nature to control pests but their broad spectrum of harmful effects extends far beyond the pest. The objective of this research was to investigate the effect of sub-lethal chlorpyrifos effect on ovarian protein and carbohydrate content of the freshwater catfish “Heteropneustes fossilis”. LC₁₀, LC₂₅ and LC₅₀ value of chlorpyrifos were calculated for 24, 48, 72 and 96 hr by probit analysis (Finney, 1971). The LC₁₀, LC₂₅ and LC₅₀ value for 24 hr were 9.79, 21.59 and 51.95µl/l, and 3.3, 7.54 and 18.91µl/l for 48 hr, and for 72 hr: 0.85, 2.39 and7.47µl/l. The 96 hr LC₁₀, LC₂₅ and LC₅₀ value were 0.12, 0.55 and 4.64µl/l respectively. The result showed that CPF significantly (p<0.05) decreased the ovarian protein and carbohydrate concentration. Therefore, it may be concluded that CPF is highly toxic to aquatic organism.

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