For two days, following intense heat and thunderstorms, dead fish have appeared, drifting and floating en masse in a corner of the CV1 regulating lake park.

On 30/5, environmental sanitation workers began collecting and disposing of the fish. Cleanup efforts are expected to conclude by the end of the day.

By the afternoon of 30/5, many dead fish still floated on the surface of the CV1 regulating lake park. *Vo Hai*

A representative from Cau Giay ward stated that the number of dead fish has not yet been quantified, and the cause remains undetermined. However, the city recently experienced an intense heatwave with temperatures reaching 40 degrees Celsius for several days, followed by heavy rain. This sudden change in the water environment may have caused the widespread fish deaths.

The stormwater and wastewater drainage systems around the CV1 regulating lake are currently shared. Heavy rainfall carries unsanitary water sources directly into the lake, leading to water pollution.

The Ward People's Committee has proposed that the Hanoi Department of Construction implement wastewater treatment measures to prevent discharge into the lake, maintain clean water quality, and ensure water levels preserve the landscape.

Dead fish floating en masse in a corner of the CV1 regulating lake park, Cau Giay, Hanoi. *Vo Hai*

The City Technical Infrastructure Management Center, under the Hanoi Department of Construction, reported dispatching officials to collect water samples from the regulating lake to determine the cause of the fish deaths.

Construction of the CV1 regulating lake park began in July 2016 and it was handed over for use in 2024. The park covers a total area of 31,76 hectares, with 19 hectares dedicated to regulating lakes and the remaining 12,7 hectares for greenery and recreational areas.

According to the plan for naming streets and public works, the park is expected to be named An Hoa.

Vo Hai