1, live crabs in the refrigerator frozen dead, not recommended to eat, because once the crab is dead, the body of the bacteria will be a large number of breeding, decomposition of crab meat, some bacteria also produce toxins, if you eat such crabs will cause food poisoning, the common manifestations of nausea, vomiting, abdominal pain, diarrhea; the serious cases of dehydration, electrolyte disorders, convulsions, and even shock, coma, septicemia, and so on.

2, in the purchase of crabs must pay attention to whether the fresh, do not buy already dead crabs, especially river crabs, and in the use of the time to cook through boiled, in order to kill the crab inside and outside the contamination of germs.

3, crab arthropoda, crustacean subphylum, soft armor, true soft armor subclass, decapoda, abdominal embryo suborder, short tail under the order. It is a crustacean (crustacean), the body is protected by a hard shell, rely on gills to breathe. In biological taxonomy, it is the same kind of animal as shrimp, lobster, and hermit crab. The vast majority of species of crabs live in the sea or offshore areas, with some inhabiting freshwater or land.

4, crabs spend most of their time looking for food, they are generally not picky eaters, as long as the chelipeds can get food can eat, small fish and shrimp is their favorite, but some crabs eat seaweed, and even even animal carcasses and plants can eat. Therefore, edible crabs have a good selection, especially do not choose already dead crabs, at the same time, be sure to heat processing through, so as not to survive germs, ingested into the body leading to germs infection.