The grub midge belongs to a kind of crab, scientific name saw-margined blue crab, belongs to Crustacea, Portunidae (gazami crab family). It is not much different from the crab.

Saw-margined blue crabs like to live in the shallow sea near the shore and the estuary of the mud and sand bottom, ferocious, carnivorous, the main food fish and shrimp shellfish. The meat is delicious, nutritious, and has the effect of nourishing and strengthening the body. Especially pregnant female crabs, the body will produce red or yellow paste, which in southern China is called "paste crab", "sea ginseng," said.

Habitat

The green crab, as a burrowing aquatic crustacean, likes to inhabit intertidal sandy beaches, mangrove forests or marshes, living in burrows during the day and coming out at night to forage for food. Green crabs are agile and have very sensitive sensory organs. In summer, it likes to use its feet to support its body in the high tide zone, and at low temperatures, it lurks in the mud and sand, only exposing its eyes.