Hanoi Lake Sees Mass Fish Kill After Water Level Lowered for Flood Control

Authorities in Hanoi are investigating a mass fish kill in the Nghia Do Park lake, which occurred after the water level was deliberately lowered to manage potential flooding. The incident saw approximately 800 kilograms of dead fish removed from the lake's surface.

The lowering of the water level was a preventative measure undertaken by the Technical Infrastructure Management Center of Hanoi, which manages the lake's water levels to combat urban flooding. According to a center official, the combination of the lowered water level and an influx of wastewater led to the fish deaths.

To address the situation and improve the lake's condition, the center plans to introduce beneficial microorganisms. These microorganisms are expected to create oxygen bubbles, thereby replenishing the oxygen levels in the water and neutralizing pollutants. The city is also working on separating wastewater and rainwater systems in the inner city to prevent contaminated water from entering the lake.

This event is not isolated; a similar fish kill occurred in late May at another lake in Hanoi's CV1 park, indicating persistent challenges with water quality in the city's urban water bodies. The Nghia Do Park incident has prompted immediate action from local authorities to clean up the lake and implement technological solutions to prevent future occurrences.

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To prevent flooding, the center had to lower the water level in the lake. When the water level dropped, combined with the influx of wastewater, it caused the fish to die.