Agriculture, Fisheries and Conservation Department



Press Releases

Red tide sighted
Friday, May 12, 2017

A red tide has been sighted over the past week, an inter-departmental red tide working group reported today (May 12).
The red tide was reported by staff of the Leisure and Cultural Services Department at Deep Water Bay Beach, Hong Kong Island, on May 6. The red flag was hoisted immediately.
The red tide has dissipated and no associated death of fish has been reported.
A spokesman for the working group said, "The red tide was formed by Akashiwo sanguinea and Prorocentrum rhathymum. Akashiwo sanguinea is commonly found in Hong Kong waters and non-toxic, whereas Prorocentrum rhathymum is less common and overseas studies suggest that this species is capable of producing haemolytic and fast-acting toxin."
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 monitoring red tide occurrences to minimise the impact on the mariculture industry and the public.


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Last Review Date : 12 May 2017