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)

Birds rest 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)

A fisherman rows a boat back home 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)

A woman fixes a fishing net 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)

Fishermen put fishing tools in order 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)