This experiment was carried out to evaluate the effect of an organophosphate pesticide, sumithion onwater and sediment quality and benthic invertebrates in aquaculture ponds for 120 days. Three treat-ments were tried in duplicate: no sumithion (control), weekly application of 1.0 mg/L sumithion (Lowdose treatment) and 2.0 mg/L sumithion (High dose treatment). Among the different water quality p…