River crabs, also known as "crabs" or "hairy crabs", belong to crustaceans of arthropod phylum. The head and chest of Eriocheir sinensis are combined to form a square breastplate with hard texture. There are a pair of eyes at the front of the body and two pairs of very sharp crab teeth on the side. A pair of appendages at the front end of the crab are called claw feet, and the surface is covered with fluff; There are 4 pairs of walking feet behind the claw feet, which are flat and long; Abdominal limbs have degenerated. The sex of a river crab can be distinguished by its abdomen: the abdomen of a female crab is round, and that of a male crab is triangular.

Eriocheir sinensis often burrows in mudflats of rivers, lakes and swamps, moves at night, feeds on fish, shrimp, animal carcasses and grains, often migrates to estuaries every autumn to lay eggs, hatches in March-May of the following year, develops into young crabs, and then goes upstream and continues to grow in fresh water. The tender meat of river crab is a popular food.

Nutritional value: Eriocheir sinensis belongs to crab crab family, also known as Eriocheir sinensis, or Eriocheir sinensis. There are many kinds of crabs, including river crabs, lake crab, sea crabs and stone crabs. Most of them are medicines. Eriocheir sinensis is salty and cold, with little toxicity, and has the effects of promoting blood circulation, strengthening tendons and bones, and removing lacquer poison. Crab forceps can induce labor and delivery.

Famous crabs in China: Yangcheng Lake Hairy Crab, Gucheng Lake Hairy Crab, Liangzihu Hairy Crab, Tianjin Purple Crab and Laizhou Crab.