Sea crab: The shell of fresh sea crab is blue-gray, the claws and legs are complete, the claws and feet are mostly purple with white spots, the abdomen is partially or completely white, the leg joints are elastic, the tips of the shells at both ends of the crab are intact, the abdomen of the male crab is triangular, and the female crab is round. The back of the male crab is dark green, the female crab is purple and the abdomen is gray.

Eriocheir sinensis: The crab shell is turquoise and shiny, with a pair of appendages in front called claw feet, and the surface is covered with fluff. The crab feet have strong clamping force, full legs (hard but not empty), fast climbing speed and continuous spitting. The sex of a river crab can be distinguished by its abdomen: the abdomen of a female crab is round, and that of a male crab is triangular.

Morphological color

Two different growing environments

Sea crab: Sea crab, as its name implies, is a kind of crab that grows in the sea. Sea crabs are the main species in the coastal areas of China. Generally, they live and breed on the seabed of 3-5 meters, migrate to the deep sea of 10-30 meters in winter, and like to make holes at the bottom of sediments.

Eriocheir sinensis: Eriocheir sinensis, whose scientific name is Eriocheir sinensis, is a kind of crab that grows in fresh water and breeds in river water. Eriocheir sinensis likes to live in mud flats or mud caves in rivers and lakes, or hide in gravel and aquatic plants, and often moves at night. It is a precious freshwater product.

Different growing environments

Three different farming methods

At present, most of the seafood in China is natural fishery products, which are listed as chilled products after being caught ashore during the fishing moratorium; Most of the river crabs sold on the market now are cultured products, which are not as natural as sea crabs.

Different farming methods

Four different fishing periods

Fishing period of sea crabs: The fishing period of sea crabs is spring and autumn, mostly in April-May and September-10, and the fishing period is relatively long.

Crab fishing period: crabs usually lay eggs in autumn every year, so autumn is also the best season for crab fishing. It is best to eat crabs from the end of September to the middle of June and from May to February every year.

5 Nutritional differences

River crabs and sea crabs have their own advantages in nutrition. At the same weight, the contents of vitamin A, vitamin B 1, vitamin B2 and vitamin E in river crabs are higher than those in sea crabs, but the contents of calcium, potassium and magnesium are lower than those in sea crabs. As far as cholesterol is concerned, the content of river crabs is more than twice that of sea crabs, and that of protein is slightly higher than that of sea crabs.

Nutritional differences

How to choose a good crab

Buy fresh crabs, and choose crabs to do "five looks": look at the color; Second, look at the individual; Third, look at the navel; Fourth, look at crab hair; Fifth, look at the action. The color of crab should be green back and white belly, golden claws and yellow hair; Individuals should be big, old and healthy; The navel should protrude outward; Crab feet should be hairy; Action should be agile and active, and those who meet these five conditions are good crabs.