Abstract
The aim of the present studies the toxicological effects of alphamethrin (Astra) on freshwater predatory fishes. The toxicity was time as well as dose dependent. The Pesticide exposure may also fatal to many non- target organisms. Due to the hazardous effects of pesticides on aquatic organisms, it is necessary to predict pesticidal pollution in aquatic medium as soon as possible. Alphamethrin, a synthetic pyrethroid insecticide used as controls a wide range of pests in agriculture field and public programmme. Alphamethrin, one of the most extensively studied pesticides, may induce many significant changes body in fishes. The Alphamethrin has shown strong piscicidal activity in freshwater fish Colisa fasciatus and Mystus mystus for all the exposure periods (24 or 96h) in time as well as dose dependent manner. The LC₅₀ values decreases from 0.049 (24h) to 0.012 (96h ) in a winter season (water temp. 19⁰) and 0.043(24h) to 0.028 (96h) in a summer season (water temp. 20⁰c) against freshwater fish Colisa fasciatus and The LC₅₀ values decreases from 0.042 (24h) to 0.017 (96h ) in a winter season (water temp.19⁰) and 0.039 (24h) to 0.013 (96h) in a summer season (water temp. 20⁰c) against freshwater fish Mystus mystus.
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