A fisherman demonstrates quality certificate labels which will be attached to Chinese mitten crabs in Bacheng town of Kunshan, East China's Jiangsu province, Sept 23, 2014. The 2014 harvest season for Chinese mitten crabs (Eriocheir sinensis) in the Yangcheng Lake, a major producing area, began on Tuesday. Also known as the big sluice crab, the Chinese mitten crabs are favoured by many gourmet-lovers and sell well both online and in real markets. [Photo/Xinhua]