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Overview of the Current Week
2025/03/28 - 2025/04/03
Two red tides were sighted during the past week, the Inter-departmental Red Tide Working Group reported today (April 3).
On March 28, staff of the Leisure and Cultural Services Department (LCSD) spotted the first red tide at Silverstrand Beach, Sai Kung. Another red tide was spotted at Clear Water Bay Second Beach, Sai Kung, on April 2 by staff of the LCSD. The red tide at Silverstrand Beach has dissipated while the red tide at Clear Water Bay Second Beach persists. No associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tide at Silverstrand Beach was formed by This link will open in a new windowNoctiluca scintillans, while the red tide at Clear Water Bay Second Beach was formed by This link will open in a new windowScrippsiella acuminata. Both algal species are common in Hong Kong waters and non-toxic."
The Agriculture, Fisheries and Conservation Department (AFCD) urged mariculturists at the fish culture zones of Ma Nam Wat, Kau Sai, Kai Lung Wan, Tai Tau Chau, Leung Shuen Wan, Tiu Cham Wan, Tung Lung Chau and Po Toi O 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: 2025/04/03 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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