Countless white floats for mussel farming spread on the vast blue sea around the Gouqi Island in Shengsi county, Zhoushan, East China's Zhejiang province on a clear day. The island is the major mussel production area in the county, with a farming area of the size of more than 1,500 standard football fields (about 1,071 hectares) and an annual yield of more than 70,000 metric tons. [Photo/zj.zjol.com]