Workers at the Linghan Fishery Association fish for Yellow River carp in Ningxia Hui Autonomous Region on Oct. 7. Dubbed an oasis in the loess highlands, the region promotes pollution-free aquatic farming to improve the market competitiveness of its fisheries. As of now, 65 aquatic products bred in the region's 15,000-hectare pollution free zone have been certified pollution free. The total output from the region's fishing industry exceeded 1.5 billion yuan (US$240 million) in 2010. [Photo: Xinhua]