The size of a palm. The shell of the crab is relatively heavy. Generally, the diameter of the crab cover is about 45mm and the weight is about 2 liang. For every 5 ~ 7mm increase in the diameter of the crab cover, the weight of the crab will increase by about 1 liang. Crabs are crustaceans, and their bodies are protected by hard shells. 1.5 how big is the reference for two crabs? The body of the crab is divided into head, chest and abdomen. There are 5 pairs of chest feet. The male abdomen is narrow and long, mostly triangular, and the female abdomen is wide and densely covered with bristles.
Most kinds of crabs live in the sea or offshore areas, and some live under the stones of fresh water, land and mountain streams.
The back shell of crabs is cyan black and orange red after cooking. The edible crabs include Portunus trituberculatus, Portunus pelagicus, green crab and Eriocheir sinensis. （1.5LiangDePangXieYouDuoDaCanZhaoWu）