Previous Red Tide Occurrences

Click on the week for red tide occurrences during that period in the past month

> 2025/05/30 - 2025/06/06

> 2025/05/23 - 2025/05/30

> 2025/05/16 - 2025/05/23

> 2025/05/09 - 2025/05/16

 
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Overview of the period 2025/05/30 - 2025/06/06

No red tide was reported during this week.

Last update: 2025/06/06 noon

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Overview of the period 2025/05/23 - 2025/05/30

No red tide was reported during this week.

Last update: 2025/05/30 noon

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Overview of the period 2025/05/16 - 2025/05/23

No red tide was reported during this week.

Last update: 2025/05/23 noon

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Overview of the period 2025/05/09 - 2025/05/16

A red tide was sighted during the past week, an inter-departmental red tide working group reported today (May 16).

On May 10, staff of the Marine Department spotted a red tide at Victoria Harbour near Hung Hom. 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 Noctiluca 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 here to view the location of red tide sighted in Hong Kong waters.

Last update: 2025/05/16 noon

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