China's largest crab breeding base is located in Panjin City, Liaoning Province, which is known as the first city of river crabs in China. According to the heaviest crab, in 20 1 1 year, a giant wild river crab weighing 3.2 kg was recaptured around Yanghe River, a tributary of Liaohe River in Panjin, which is called the ancestor of crabs. This overlord-level freshwater crab is not only related to the high-quality inheritance of crabs, but also has an absolute relationship with the living environment, the number of aquatic plants and the water temperature.