An aerial view shows a shrinking Hongjianzhuo Lake in Yulin city, China's biggest freshwater lake in desert areas, Northwest China's Shaanxi province, Nov 18, 2011. The fish output of the lake used to reach 360 tons a year. However, it is rare to see any fish in the lake now. As the lake continues to shrink, its water has become more salty and its pH reading has reached 9.6, while the maximum reading suitable for fish is 8.5, according to Li Weiping, the head of a fish monitoring station in northwest China's Shaanxi province.

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