1. If it is a white goo, it may be crab paste. The main component of crab paste is male crab sperm, and the secondary component is fat. The natural state of crab paste is a blue-white translucent colloidal liquid; After steaming, it is translucent, sticky and a little greasy. Edible and delicious.

The white thing on the crab shell may be an infected parasite. Crabs grow in a complex environment and are easily infected with parasites. It's normal to see white things on crab shells. Therefore, eating crabs must be disinfected at high temperature, and parasites will die after being cooked thoroughly.

3. There are milky white linear substances in crabs, which are the gills of hairy crabs. If one end is fixed, it is the gill of the hairy crab, and this can't be eaten. If the "strips" are not fixed and are not in every hairy crab, it is best not to eat them.

Introduction to crabs:

Crabs belong to the animal kingdom, arthropods, crustaceans, mollusks, soft armor, Decapoda, Gastropoda, Anura. It is a crustacean. Its body is protected by a hard shell and breathes through its gills. Taxonomically, it is the same kind of animal as shrimp, lobster and hermit crab. Most kinds of crabs live in the ocean or offshore areas, and some live in fresh water or land.

They rely on the mother crab to give birth to small crabs, and every time the mother crab will lay a large number of eggs, the number can reach more than one million. The amount of genetic material of this kind of organism is complex and varies greatly, often as many as 100 pairs. Common crabs are hairy crabs (river crabs, hairy crabs, clear water crabs) and swimming crabs.

China is rich in crab resources, among which the hairy crabs produced in Gucheng Lake, Taihu Lake, gaoyou lake, Yangcheng Lake, Xiefu, Xinghua and Hongze Lake in the lower reaches of the Yangtze River are the top grade.