Sea water in Thien Cam town and Cam Nhuong commune, Cam Xuyen district turns red due to algal bloom, also known as red tide.
According to a report from the Ha Tinh Department of Natural Resources and Environment, the red tide broke out due to algae Noctiluca scintillans at high density. This phenomenon appears in sea areas, especially straits, near river mouths and seaports. “Algae blooms usually appear in 3-7 days, usually in March-April, after a cold spell. When the weather is warm and there is sunlight, the algae disappear on their own," the report stated.
The sea water turned red in Thien Cam town and Cam Nhuong commune, March 25. Video: Hung Le
The leader of the Ha Tinh Center for Natural Resources and Environmental Monitoring said that professional staff measured pH levels and dissolved oxygen demand at the scene; Laboratory analysis of parameters affecting human health, the underwater environment, ecological and aquatic life, organic compounds, and heavy metals. The results showed that "the indicators are within the allowable limits".
“This is a normal phenomenon and does not affect the fishermen's going out to sea to catch seafood. Now the sea water is clear again, so it does not affect swimming or using seafood in this sea area," the leader said, adding that he will monitor sea water quality in Cam Xuyen district and arrange more officers. surveillance sampler.
Previously on May 23, in Thien Cam town and Cam Nhuong commune, Cam Xuyen district, a strip of sea water nearly 5 km long and about 3 m wide from the shore turned dark red. By the afternoon of May 100, the water gradually faded, and the same evening it turned blue.
The water turns red in the nearly 3 km long strait in Thien Cam town and Cam Nhuong commune, March 25. Image: Duc Hung
Red tide, also known as algal bloom, is a phenomenon of excessive algae reproduction, unrelated to tidal movement. Algae buildup in estuaries, oceans, or freshwater often causes the water surface to become cloudy or discolored, which can be purple, pink, blue, or red.
In October 10, sea water in the Cua Nhuong bridge area, bordering Cam Linh and Cam Nhuong communes, Cam Xuyen district, was divided into two colors: opaque yellow and gray. A specialized agency took samples to check and determine whether it was caused by seaweed.
