As the stench from 90 acres of the water body enveloped the air, marine life experts and city corporation authorities rushed to the spot. According to a preliminary finding, they said the oxygen level in the lake water did not match the density of the fish in the lake. "The Biological Oxygen Demand (BOD) level may have gone down due to the approaching summer. Increase in aquatic weeds and algae could have contributed to the situation," the experts explained. They added the fish in the lake had not been harvested for food etc for a long time, although there was a contract in place with the Fisheries Co-operative Society.