Largest-ever algae bloom hits China's shores A man swims in seawater covered by a thick layer of green algae. More than 20,000 tonnes of the seaweed has been removed from Qingdao's beaches. Photo: ChinaFotoPress BEIJING: China's coast has been hit by a massive algae growth, officials say, with vast waves of green washing onto the shores of the Yellow Sea. Pictures on Thursday showed beachgoers swimming and playing in the green tide in the eastern city of Qingdao, while bulldozers shovelled up tonnes of algae from the sand. The State Oceanic Administration said on its website the algae, enteromorpha prolifera, started to appear a week ago and had spread across an area of 28,900 square kilometres. Visitors play at a beach engulfed in seaweed. The previous largest bloom was in 2008 when it affected around 13,000 square kilometres, it said. Qingdao officials said they had removed around 7335 tonnes of algae, the official Xinhua news agency reported. The algal phenomenon is usually caused by an abundance of nutrients in the water, especially phosphorus, although the triggers for the enormous blooms which began to appear in the Yellow Sea in 2007 remain uncertain. The China Daily quoted professor Bao Xianwen, of the Qingdao-based Ocean University of China, as saying: ""It must have something to do with the change in the environment but we are not scientifically sure about the reasons."" The algae are not toxic nor detrimental to water quality but lead to extreme imbalances in marine ecosystems by consuming large quantities of oxygen and creating hydrogen sulphide.