"I have visited Bengaluru twice and held meetings with all concerned authorities and officials, which includes Special Lake Development Authority, state government, plus Municipal Corporation and organisations responsible for maintaining the lake. They have given us a timelime on how to improve the quality of lakes. We are monitoring it.
"I have already ordered an inquiry and sought a report on the issue," Javadekar said.
"The very fantastic eco-system of lakes in Bengaluru has been destroyed for the last 30 years gradually because (residential) colonies around it release the discharge not in the city drains. At many places, there are no city drains, so they release their discharge in the lakes.
"This is the condition we inherited and we are improving that," Javadekar said.
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The fish are believed to have died due to high levels of pollution into the lake.
The incident comes even as there is a growing concern by environmentalists over polluted lakes, exemplified by the thick froth and flames from the Yamlur lake that caused ripples in the city last year.