Toxic waters after Bengaluru rains lead to mass fish deaths in city lakes

Following the recent heavy rains in Bengaluru, alarming reports have emerged from several parts of the city showing thousands of dead fish floating on the surface of local lakes. The culprit: sewage water mixing with lake water, turning it toxic and unfit for aquatic life.

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In lakes around BTM Layout and other low-lying areas, the rains caused nearby drains to overflow, discharging untreated sewage and runoff directly into the lakes. This sudden influx of contaminants led to a drastic drop in oxygen levels in the water, resulting in the mass death of fish. Residents waking up to the sight of lifeless fish carpeting the edges of these lakes were left shocked and concerned.

Experts suggest that the "first flush" of rain after dry spells often brings with it a high concentration of pollutants from roads, sewers, and garbage drains. When this water enters water bodies, especially closed systems like lakes, it can be catastrophic for aquatic life. The current incident is a stark example of poor stormwater management and the long-ignored issue of untreated sewage flowing into Bengaluru’s lakes.

This fish kill is not just an environmental tragedy but also a health concern. Stagnant, polluted water can quickly become a breeding ground for harmful bacteria, affecting communities nearby.

Authorities need to urgently improve lake maintenance and ensure that storm drains and sewage systems are separated and well-regulated, especially in the face of increasingly unpredictable weather patterns.