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Overview of the Current Week
2025/03/21 - 2025/03/28
Two red tides were sighted during the past week, the Inter-departmental Red Tide Working Group reported today (March 28).
Both red tides were spotted by staff of the Marine Department at Sha Tin Hoi and Tolo Harbour (including the Yim Tin Tsai Fish Culture Zone) on March 24 and 25 respectively. Both red tides still persist and no associated fish deaths have been reported as of today.
A spokesman for the working group said, "Both red tides were formed by This link will open in a new windowAsterionellopsis glacialis, which is commonly found in Hong Kong waters and non-toxic."
The Agriculture, Fisheries and Conservation Department (AFCD) urged mariculturists at the fish culture zones of Yim Tin Tsai, Yim Tin Tsai (East), Yung Shue Au and Lo Fu Wat to monitor the situation closely and increase aeration where necessary
Red tide is a natural phenomenon. The AFCD's proactive phytoplankton monitoring programme will continue to monitor red tide occurrences to minimise the impact on the mariculture industry and the public.
Please click This link will open in a new window here to view the location of red tide sighted in Hong Kong waters.
You can visit the This link will open in a new windowHong Kong Red Tide Information Network for information about red tide or This link will open in a new windowpress here to view real-time water quality in fish culture zones.
Last update: 2025/03/28 noon
Red Tide Reporting Network
We welcome your assistance in reporting red tide to us. Please record the following information:
(1) location of red tide
(2) colour of the seawater
(3) extent of the red tide
(4) occurrence of dead fish and any other abnormal features observed around the red tide.
Please report to:
3468 3714 (office hours) OR 1823 (outside office hours)
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