Portunus trituberculatus is a kind of sea crab, which is difficult to survive after leaving seawater, and the survival time is also closely related to the preservation method. If the swimming crab is kept at room temperature, it can be kept for about three days. If it is tenacious, it may live longer. If it is kept in the refrigerator, it can be kept for about a week. Fresh swimming crab must be eaten as soon as possible, otherwise it will affect the taste.

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