Mercury, a very toxic and dangerous substance, has severely contaminated the environment and the food chain throughout India.With rising mercury imports continuing unabated, and a pollution problem that has already assumed gargantuan proportions, India sits on the brink of a disaster. Vembanadu Lake one of the Ramsar site in Kerala is polluted severely by heavy metals and mercury.The fishery sector in Vembanadu lake is under threat due to pollution. Vembanadu Lake once famous for its its rich source of fishes is in peril. Several species of fishes and other aquatic organisms were endangered. People who consume fishes and fishery products are susceptible to mercury and heavy metal pollution. If necessary steps were not taken we have to face bitter consequences.