A fisherman demonstrates a quality certificate label that is to be attached onto a Chinese mitten crab 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]