Chinese mitten crabs, also known as hairy crabs, hairy crabs, and river crabs, are all the same thing. The crab claws are covered with velvet. They are all young crabs before reproductive migration. Because of their yellowish shell color, they are commonly known as "Yellow Crab". After the last molt, the shell turns dark green and develops into a "green crab", which is suitable for steaming to retain the umami flavor to the greatest extent.

Trituberculous swimming crab, also known as gun crab, is in the shape of a shuttle with protruding spikes on both sides and protrusions on its back. Quick freezing of live crabs can maintain the original flavor and is suitable for steaming and fried rice cakes. Swimming crabs have a fishy smell. , you can use a heavier approach.

Ocean swimming crab, also known as flower crab, has patterns on its back, and its taste and preparation are similar to gun crab.

Scylla serrata is commonly known as blue crab. It has jagged protrusions in the front of the shell and large pliers. It is easily mistaken for hairy crabs, but the texture of blue crab meat is firm and it is good both steamed and boiled.