An aquacultural expert grades a crab during the 5th Fengshou Cup National River Crab Contest in Shanghai, east China, Nov. 6, 2011. More than 40 crab-raising enterprises sent about a thousand crabs to compete for the `crab king and queen of the year` and other awards. (Xinhua/Pei Xin)

A staff member shows a crab during the 5th Fengshou Cup National River Crab Contest in Shanghai, east China, Nov. 6, 2011. More than 40 crab-raising enterprises sent about a thousand crabs to compete for the `crab king and queen of the year` and other awards. (Xinhua/Pei Xin)

A staff member shows the `Hairy Crab King of the Year` during the 5th Fengshou Cup National River Crab Contest in Shanghai, east China, Nov. 6, 2011. More than 40 crab-raising enterprises sent about a thousand crabs to compete for the `crab king and queen of the year` and other awards. (Xinhua/Pei Xin)