The sea crab Portunustrituberculatus, commonly known as pike crab and white crab, belongs to Crustacea, Decapoda, Portunidae, and is an economically important crab along the coast of China. Its rapid growth and lucrative culture have made it an important culture species in China's coastal areas. Pike crabs generally live and reproduce in the bottom of the sea at a depth of 3-5 meters, and in winter, they move to the deep sea at a depth of 10-30 meters, preferring to burrow at the bottom of the mud and sand. Its adaptive salinity of 16 ‰ -35 ‰, the water temperature at 4 ℃ -34 ℃, PH value between 7-9, the optimal salinity of 26 ‰ -32 ‰, the optimal temperature at 22 ℃ -28 ℃. Water quality requires freshness, high dissolved oxygen, when the environment is not adapted or the shelling is not attempted when there is a self-cutting footsteps phenomenon, footsteps can be regenerated after cutting off.

One species of the genus Portunus in the family Portunidae of the decapod order Short-tailed suborder Portunidae, also known as the grim gazami crab, is named after the portunus-shaped cephalothorax and the three conspicuous warts on the back of the stomach and heart area. There are more than 50 known species of the genus Portunus in the Indo-West Pacific region, and 17 species have been found along the coast of China, and this species is produced in China, Japan and Korea. The anterior lateral margin is obliquely arched, with 9 acute teeth, and the posterior margin terminates in a spine. The fourth (last) pair of steppers with paddle-like palm joints and knuckles are swimming feet. The abdomen of males is elongate-triangular, and that of adult females is subcircular.

The sea crab inhabits inshore water depths of 7 to 100 meters of soft mud, sand and mud under the bottom of the rock or in the water grass. A few small or medium-sized individuals can also be harvested from the low tide line in the intertidal zone. They often use the fingertips of the first three pairs of stepping feet to crawl slowly on the seabed, swim with the swimming feet, or to the side forward, or to the side backward. When encountering enemies, they raise their chelae upward to defend themselves or attack each other, or use the last two segments of the swimming feet to dig up sand and dive their bodies upright into the bottom. They have the habit of feeding at night, and have obvious phototropism, which can be trapped by lights.