Fishermen are seen on a boat on the Keluke Lake in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, July 13, 2013. The annual output of aquaculture of the Keluke Lake has reached 200 tons so far, with the production value exceeding 4 million yuan (651,600 U.S. dollars). (Xinhua/Wang Bo)