A large number of fish were found dead in the Samudravalli tank, near the industrial area on the outskirts of Hassan city, on Wednesday morning.
People rearing fish in the tank have alleged that effluents released from a lutein manufacturing unit were the cause for the fish-kill.
Many schoolchildren and residents of villages around the industrial area had staged a protest against Omnikan Earth Sciences Pvt. Ltd., the lutein manufacturing unit, on September 3, alleging that untreated effluents dumped on the industry premises was causing foul smell. Following the protest, Karnataka State Pollution Control Board issued a show-cause notice to the unit for releasing untreated effluents into an open pond, resulting in the foul smell.
Villagers alleged that following the protest, industry authorities emptied the pond by letting out the effluents into the Samudravalli tank.
Nagaraj, who rears fish in the tank, told The Hindu that he had let over 27,000 fish into the tank.
“Thousands of fish are dead today. More may die by tomorrow, ruining my investment. Villagers are also fed up with the pollution being caused by the industry,” he said.