The cap diameter of Eriocheir sinensis is above 50mm, and that of Eriocheir sinensis is about 45 mm ... On the basis of Eriocheir sinensis, every 5-7mm increase in the cap diameter will increase the weight by about 50g, and so on, and other crab cap sizes can be obtained, so the cap diameter of Eriocheir sinensis is above 50 mm..

Physical characteristics:

Crab's body is divided into head, chest and abdomen. The head, chest and back are covered with head and breastplate, and the shape varies from species to species. There are 1 and 2 pairs of antennae in the center of the forehead, and compound eyes with stalks on the outside. The mouthparts include 1 pair of big jaws, 2 pairs of small jaws and 3 pairs of jaws. There are five pairs of chest feet on both sides of the head breastplate. The abdomen degenerates, flattens and bends on the ventral surface of the head and chest.

The male abdomen is long and narrow, mostly triangular, and only the first two pairs of appendages are deformed into connectors; The female has a broad abdomen, and there are 1 pairs of double-branched appendages in the 2nd to 5th sections, which are densely covered with bristles for holding eggs. Most crabs are marine, with the most species in tropical shallow waters.