How red tides occur, why they smell bad, why you should not swim in one and why your dog should stay out of the water

Red tides returned to Hong Kong shores this week.A natural phenomenon caused by large concentrations of microscopic algal blooms, the latest ones involved Noctiluca scintillans, a non-toxic species of plankton common in Hong Kong waters, says the city government’s interdepartmental red tide working group.Red tides were spotted on the south side of Hong Kong Island, in Victoria Harbour and on outlying Lamma Island. “Given the wide extent of these current red tides, the situation may last for…

Read the original article at South China Morning Post