Scores of fishes were found dead in Guruvayanakere in Kuvettu village of Belthangady taluk. The village is situated on Karkala-Belthangady highway.
The lake, which covers three acres of land is home to a variety of fishes.
According to local residents, they had been observing a change in colour in Guruvayanakere for the past one week, while the fishes started dying since Sunday.
Kuvettu Gram Panchayat PDO Geetha said that the reason for the death of fishes is not known. The water samples have been collected and sent to laboratories in Belthangady and Mangaluru for testing.
The spot was visited by Belthangady Tahsildar Mahesh J.
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