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Click on the week for red tide occurrences during that period in the past month
> 2025/09/19 - 2025/09/26
> 2025/09/12 - 2025/09/19
> 2025/09/05 - 2025/09/12
> 2025/08/29 - 2025/09/05
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Overview of the period 2025/09/19 - 2025/09/26
No red tide was reported during this week.
Last update: 2025/09/26 noon
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Overview of the period 2025/09/12 - 2025/09/19
A red tide has been sighted over the past week, the Inter-departmental Red Tide Working Group reported today (September 19).
The red tide was spotted by staff of the Agriculture, Fisheries and Conservation Department (AFCD) on September 15 in the waters of Tolo Harbour. 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 Pseudo-nitzschia calliantha, which is not common in Hong Kong waters. According to literature overseas, the algal species might produce toxin. However, no such reports have been recorded in Hong Kong so far."
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 here to view the location of red tide sighted in Hong Kong waters.
Last update: 2025/09/19 noon
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Overview of the period 2025/09/05 - 2025/09/12
A red tide has been sighted over the past week, the Inter-departmental Red Tide Working Group reported today (September 12).
The red tide was spotted by staff of the Agriculture, Fisheries and Conservation Department (AFCD) on September 10 at the waters in Sha Tin Hoi. The red tide still persists and no associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tide was formed by Pseudo-nitzschia calliantha, which is not common in Hong Kong waters. According to literature overseas, the algal species might produce toxin. However, no such reports have been recorded in Hong Kong so far."
The AFCD urged mariculturists at Yim Tin Tsai, Yim Tin Tsai (East), Yung Shue Au and Lo Fu Wat 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 here to view the location of red tide sighted in Hong Kong waters.
Last update: 2025/09/12 noon
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Overview of the period 2025/08/29 - 2025/09/05
No red tide was reported during this week.
Last update: 2025/09/05 noon
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