It should be swimming crab-swimming crab, which is commonly called "white crab" in some places. Because the breastplate is spindle-shaped, it is named spindle-shaped. There are three protrusions in the center of the crustacean, so it is also called "Portunus trituberculatus" and belongs to arthropods. The male umbilical cord is smooth, the claws are long, and the shell surface is blue; The female umbilical cord is round and fluffy, and the shell surface is ochre or spotted.