Portunus oleracea is an important economic crab along the coast of China. Its scientific name is “scaly” and it is commonly known as “white crab” in some places. It is named because the head breastplate is in the shape of a shuttle. There are three protrusions in the center of the carapace, so it is also called ” Portunus trituberculatus “. The male umbilicus is pointed and smooth, the claws are grown, and the shell surface is blue; the female umbilicus is round with hairs, and the shell surface is ochre or spotted. Shuttle crab fat and delicious, taste delicious, have a higher nutritional value and economic value, and is suitable for holding culture fattening sea, so the crab is crab .