SUBJECT : Lake in heart of Bengaluru city turns graveyard for fish

Early summer heat is said to have caused the death of the fish at the Ulsoor Lakein Bengaluru on Monday.— Photo: K. Murali Kumar.

Bengaluru, March 8th: Garden city’s famed Ulsoor Lake became a graveyard on Monday morning. Thousands of fish were found dead, floating on the lake’s waters, all victims of the early summer heat and soaring temperature. As the day progressed, they were washed onto the lake’s shore.

By evening, the smell of rotting fish pervaded the air as the civic body had not yet cleared the lake.

Bruhat Bengaluru Mahanagara Palike officials said that it would be cleared completely on Tuesday, and attributed the delay to Monday being a public holiday.

Fish kill in the city’s lakes have almost become an annual phenomenon, during the onset of summer. “It is usually a direct result of reduced dissolved oxygen level in the water. While algae in the lake release oxygen into the water during daytime, it uses up dissolved oxygen during night time along with the fish creating a big drop in the dissolved oxygen levels. So, most fish kills are observed in early mornings,” said a senior BBMP official.

However, eco-activist Leo Saldanah, said that the practice of letting in raw sewage into the lakes exacerbates the situation.

“Raw sewage let into the lake will be thick during summer compared to the rainy season, leading to a higher concentration of nutrients in the lake, which also causes drop in dissolved oxygen levels. The water temperature of the lake will also shoot up, leading to such fish kills,” he said. Though Ulsoor Lake in considered to be one of the more well-maintained water bodies in the city, sources said that there were multiple inlets of raw sewage into the lake.

Source: The Hindu