It dissipated the next day . the red tide was formed by gonyaulax polygramma . it had been sighted in hong kong waters before and was non - toxic 这组红潮由多纹膝沟藻组成，并不含毒素，过往亦曾在香港水域出现。
2.
Another red tide was observed yesterday ( march 22 ) at o pui tong by staff of the agriculture , fisheries and conservation department ( afcd ) . the red tide was formed by gonyaulax polygramma 昨日（三月二十二日） ，渔农自然护理署（渔护署）职员亦在澳背塘发现红潮。这组红潮由多纹膝沟藻组成。
