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Aquatic ecosystems are prone to contamination of insecticides resulting from agricultural runoff. As aquatic inhabitants are directly exposed to the contaminants in water, many aquatic animal species have been examined as the bioindicators for water contamination. Methamidophos, an organophosphorus (OP) insecticide, has been extensively used in Thai agriculture although its local toxicity studies are yet to be established. In this paper, the toxicity of methamidophos to a local freshwater fish, tilapia was studied. Subcellular changes in gill and hepatic tissues of tilapia were reviewed in sublethal exposures to methamidophos. Median lethal concentrations (LC 50) at 24 , 48 , 72 and 96 h were reported in the acute toxicity testing.

Risk assessment of methamidophos on non-target freshwater fish tilapia (<i>Oreochromis niloticus</i>)