Weigh flying crabs of the same size in your hands. The heavy weight means that the meat is not empty. If there are several raised lines under the belly of the flying crab, if they are red, it means that the meat of the flying crab is not empty. If the legs are soft and the meat runs to both sides, it means the meat is empty.

When picking flying crabs, first check whether they are fresh. You can first observe the part under the mouth of the flying crab. If it turns green, it is just about to go bad. If it turns black, it means that the flying crab has been bad and cannot be eaten. ; If the flying crab legs are soft and the meat runs to both sides, it means there is less meat, and it may have been stored for a long time and is not very fresh; if it is difficult to break and the crab legs are very hard, it means the crab is mature. , more meat.

Flying crab is a synonym for Portunus trituberculatus.

Portunus trituberculatus, commonly known as swimming crab and white crab, belongs to Crustacea, Decapoda, and Portunidae. It is an important economic crab along the coast of China. It grows rapidly and its breeding is highly profitable, and it has become an important breeding species in China's coastal areas.

The swimming crab meat is tender and white, rich in protein, fat and various minerals. Swimming crabs are the strongest in the winter swimming season, generally weighing about 250 grams and up to 500 grams.