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Toxic algae allegedly take toll on aquatic farms in south-central Vietnam

Wednesday, November 14, 2018, 16:06 GMT+7
Toxic algae allegedly take toll on aquatic farms in south-central Vietnam
A farmer at Van Phong Bay in the south-central Vietnamese province of Khanh Hoa shows a dead lobster. Photo: Tuoi Tre

Harmful algae are considered as a potential reason behind the mass deaths of a large volume of aquatic animals raised by farmers in the south-central Vietnamese province of Khanh Hoa.

The provincial Department of Agriculture and Rural Development said on Tuesday it had collected water samples at three locations on Ong Islet and Lon Islet within Van Phong Bay, after receiving complaints of the fish and lobster kill from aquaculture farmers there.

Test results showed that the content of algae had exceeded the average limits at those three locations.

The situation was most serious on Ong Islet as the number of algae was about 384,445 cells per liter on the surface and 874,763 cells per liter on the seabed, while the normal limit should be 30,000 to 50,000 cells per liter.

Cage farming at the Van Phong Bay. Photo: Tuoi Tre
Cage farming at Van Phong Bay. Photo: Tuoi Tre

All of the samples also indicated the presence of harmful species of algae which can release toxins able to kill other sea animals, according to the agriculture department.

Meanwhile, other contents, including salinity, pH levels, nitrate nitrogen, phosphorus, and chlorophyll, were within the normal range.

The province’s fishery department has advised local farmers to raise their fish in the appropriate sea areas and to regularly check the water quality.

The cages should be at least 50 meters away from each other to give the aquatic animals enough space and to make it easier for managing and cleaning.

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Duy Khang / Tuoi Tre News

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