Previous Red Tide Occurrences
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Click on the week for red tide occurrences during that period in the past month Overview of the period 2025/07/11 - 2025/07/18 No red tide was reported during this week. Last update: 2025/07/18 noon -------------------------------------------------------------------------------- Overview of the period 2025/07/04 - 2025/07/11 A red tide was sighted during the past week, the inter-departmental red tide working group reported today (July 11). On July 4, staff of the Marine Department spotted a red tide at Rambler Channel. 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 pungens, which is commonly found in Hong Kong waters and non-toxic." The AFCD urged mariculturists at Ma Wan fish culture zone to monitor the situation closely and increase aeration where necessary. Red tide is a natural phenomenon. The Agriculture, Fisheries and Conservation Department'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: 2025/07/11 noon -------------------------------------------------------------------------------- Overview of the period 2025/06/27 - 2025/07/04 Two red tides were sighted over the past week, the Inter-departmental Red Tide Working Group reported today (July 4). On July 2, staff of the Environmental Protection Department spotted a red tide at Victoria Harbour. Another red tide was spotted at West Lamma Channel by staff of the Agriculture, Fisheries and Conservation Department (AFCD) on July 3. 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 Dactyliosolen fragilissimus, which is commonly found in Hong Kong waters and non-toxic." The AFCD urged mariculturists at Lo Tik Wan, Sok Kwu Wan, Ma Wan, Cheung Sha 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 here to view the location of red tide sighted in Hong Kong waters. Last update: 2025/07/04 noon -------------------------------------------------------------------------------- Overview of the period 2025/06/20 - 2025/06/27 No red tide was reported during this week. Last update: 2025/06/27 noon -------------------------------------------------------------------------------- |
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