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Click on the week for red tide occurrences during that period in the past month
> 2025/03/21 - 2025/03/28
> 2025/03/14 - 2025/03/21
> 2025/03/07 - 2025/03/14
> 2025/02/28 - 2025/03/07
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Overview of the period 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 Asterionellopsis 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.
Last update: 2025/03/28 noon
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Overview of the period 2025/03/14 - 2025/03/21
This link will open in a new windowNo red tide was reported during this week.
Last update: 2025/03/21 noon
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Overview of the period 2025/03/07 - 2025/03/14
A red tide was sighted during the past week, the Inter-departmental Red Tide Working Group reported today (March 14).
On March 13, staff of the Environmental Protection Department spotted a red tide at Hung Shing Yeh Beach, Lamma Island. The red tide has dissipated. No associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tide was formed by This link will open in a new windowNoctiluca scintillans, which is commonly found in Hong Kong waters and non-toxic."
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.
Last update: 2025/03/14 noon
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Overview of the period 2025/02/28 - 2025/03/07
A red tide was sighted during the past week, the Inter-departmental Red Tide Working Group reported today (March 7).
On March 4, staff of the Leisure and Cultural Services Department spotted a red tide at Deep Water Bay Beach, Hong Kong Island. The red tide has dissipated. No associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tide was formed by This link will open in a new windowNoctiluca scintillans, which is commonly found in Hong Kong waters and non-toxic."
The Agriculture, Fisheries and Conservation Department (AFCD) urged mariculturists at Lo Tik Wan, Sok Kwu Wan and Po Toi fish culture zones 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.
Last update: 2025/03/07 noon
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