Food is plankton in flowing water and so on. The hair on the pliers is used to catch food in running water when eating. Eriocheir sinensis is an economic crab, also known as river crab, hairy crab, clear water crab and hairy crab. It is a famous food in China. Its claws are used for foraging and resisting enemies, and the inner and outer edges of the palm are densely covered with fluff, hence the name Eriocheir sinensis. Omnivorous animals such as fish, shrimp, snails, mussels, worms, earthworms, insects and their larvae can all be used as animal feed for hairy crabs. Lakes are widely distributed in the north and south coastal areas of China, among which the Yangtze River system has the largest output and extremely delicious taste. Eriocheir sinensis in Yangcheng Lake is the most famous among Yangcheng Lake, Gucheng Lake and Changdang Lake in Jiangsu Province because of its good water quality and crab quality. Crabs contain more vitamin A, which contributes to skin keratinization. It can also supplement calcium for rickets in children and osteoporosis in the elderly. Hairy crabs, like normal animals, are divided into males and females, which is a simple trick to distinguish the males and females of crabs. Take hairy crabs as an example. Observing the tail of the hairy crab, there is a white crab shell extending from the tail to the abdomen. Usually, we call this white crab shell a crab pocket. Crab pockets have two shapes, one is triangular and the other is semicircular.