The present studies are based on the feedback provided by Punjab fish farmers practising composite fish culture of Indian major and exotic carps. According to them, during the southwest monsoon, in ponds in the vicinity of toxicant (monocrotophos)-treated paddy fields, the eye lens of most of the culturable fishes became opaque. As a result, there was drastic decrease in the acceptability of supplementary feed, resulting in poor overall growth both in weight and length.