2019/01/17
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Red tides sighted
Friday, February 12, 2016

The red tides sighted in the waters of Tolo Harbour to Long Harbour has not dissipated yet, an inter-departmental red tide working group reported today (February 12). No report of fish loss was received in the past week. 

Another red tide was sighted by staff of the Agriculture, Fisheries and Conservation Department (AFCD) on February 10 in Sai Kung waters including Po Toi O, Kau Sai, Tiu Cham Wan, Tai Tau Chau, Kai Lung Wan and Ma Nam Wat fish culture zones. Staff of the Leisure and Cultural Services Department also observed red tides at Clear Water Bay Second Beach and Silverstrand Beach in Sai Kung yesterday (February 11). Red flags were hoisted immediately. The red tides still persist and no report of associated fish loss has been received. 

A spokesman for the working group said, "The red tides at Tolo Harbour to Long Harbour were formed mainly by Karenia mikimotoi. Overseas studies suggest that Karenia mikimotoi, which seldom forms red tide in Hong Kong waters, might cause adverse effects to fish. 

"The red tides in Sai Kung waters were formed by Akashiwo sanguinea, which is non-toxic and commonly found in Hong Kong waters."

The AFCD has stepped up monitoring of the fish culture zones throughout Hong Kong. Mariculturists have been reminded to monitor the situation closely.

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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