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http://www.theage.com.au/world/china-sends-flotilla-to-tackle-seaweed-20100708-10291.html China sends flotilla to tackle seaweed JONATHAN WATTS, BEIJING July 9, 2010 CHINESE authorities are sending a flotilla of more than 60 ships to head off a huge tide of algae that is approaching the coast of Qingdao, in north-east China. The outbreak is thought to be caused by high ocean temperatures and excess nitrogen run-off from agriculture and fish farms. Scientists involved in the operation say the seaweed, known as enteromorpha, needs to be cleaned up before it decomposes on beaches and releases noxious gases. According to the domestic media, the green tide covers 400 square kilometres. Newspapers ran pictures of coast guard officials raking up the weed as it reached the shore. As well as the 66 vessels sent to intercept the approaching algae, a net has been stretched offshore as an extra defence. Ten forklift trucks, seven other trucks and nearly 170 people were clearing up the many tonnes of seaweed that still got through. Li Delin, the engineer in charge of the beach clearance, estimated that his team had collected about 3900 tonnes as of Wednesday. The seaweed has been taken away to be processed, possibly for use as natural fertiliser or animal feed. And more is on the way. Northern China has been experiencing the hottest week of the year - in some areas, such as Beijing, temperatures have reached highs not seen in decades - which was accelerating the growth of the algae. An even bigger outbreak off Qingdao in 2008 threatened to ruin the Olympics' sailing events, prompting authorities to call on hundreds of local fishermen to help with the clean-up. The green tide is a sign of eutrophication, a build-up of algae caused by excess levels of nitrogen in the water. At low levels this causes a green slime on the water's surface, such as that often seen on polluted lakes. The green tide approaching Qingdao is harmless in its current form and, if quickly dealt with, could even help to clean the coastal waters. GUARDIAN
