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Water environment change possible cause of mass fish deaths
Thursday,  May 24, 2018,16:31 (GMT+7)

Water environment change possible cause of mass fish deaths

HCMC – Test results show water samples collected from the La Nga River in Dinh Quan District, Dong Nai Province, where more than 1,500 tons of fish were found dead a few days ago, contain higher-than-permitted concentrations of ammonium and nitrite, Thanh Nien newspaper reports.

Quick tests implemented by the Dong Nai Departments of Agriculture-Rural Development and Natural Resources-Environment and relevant agencies indicate that ammonium and nitrite contents exceed permitted levels by 5.6-11 and 10-20 times respectively.

Dissolved oxygen (DO) content is 2.6-3.2 milligrams per liter of water, lower than the standard rate of four milligrams per liter of water.

Torrential rain in Dinh Quan District lasted more than seven hours, raising contents of some gases in rivers in the region, which probably led to mass fish deaths.

Huynh Thanh Vinh, director of the Dong Nai Department of Agriculture and Rural Development, said the official cause of the incident had yet to be publicized.

The top priority now is the department will ask the provincial government to help farmers resume work. If the mass fish deaths were caused by untreated wastewater from factories, harsh penalties would be imposed on those responsible.

Vinh said the department had sent an inspection team to the farms after the news broke.

The inspection team had sent fish samples to Research Institute for Aquaculture No. 2 and water samples to the HCMC Center of Analytical Services and Experimentation for testing. The department has also calculated local farmers’ losses to promptly support them.

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