The green color of Vung Tau sea water is a natural phenomenon.

On the afternoon of November 19, Vung Tau ward said that the Department of Agriculture and Environment of Ho Chi Minh City had just sent a document to the People's Committee of Ho Chi Minh City reporting that the seawater in the ward had a green color that occurred at the end of October 2025.

In the report, the test results of the Institute of Life Sciences (Vietnam Academy of Science and Technology) showed that in the seawater sample, there was the presence of microalgae (algae species name: Noctiluca scintillans; genus name: Noticula; family name: Noctilucaceae; phylum Dinoflagellata) with a density of 80 cells/ml of seawater.

This is a widely distributed algae, density can change over time but does not produce toxins.

The sea water in Vung Tau ward has a strange blue color, which was captured by tourists and posted on social media on October 25. Photo: DUKHAT

Currently, the sea area in Vung Tau ward no longer has the phenomenon of green sea water. The Department of Agriculture and Environment and related units will continue to monitor and supervise the marine environment in this area in the coming time.

The phenomenon of green seawater is a natural phenomenon, caused by the presence of microalgae, and does not affect the environment or health. Photo: KHAC TO (taken on October 25)

Previously, on October 25, many tourists to Vung Tau were surprised and worried when they saw the sea water in the Back Beach area turning green; so they posted pictures on social media. At this time, the authorities quickly grasped the information and took samples for testing and analysis.

QUANG VU

Source: https://www.sggp.org.vn/nuoc-bien-phuong-vung-tau-co-mau-xanh-la-la-hien-tuong-tu-nhien-post824330.html