● After eating fresh crab, the bacteria in the crab will multiply rapidly and spread to the crab meat, which will cause symptoms such as vomiting, abdominal pain and diarrhea. Therefore, river crabs should eat fresh ones. ● It is best to steam and eat crabs now. If you can't finish eating them, the rest must be kept in a clean, cool and ventilated place. When eating, you must return to the pot and cook them thoroughly. ● Steamed and boiled river (lake) crabs feed on animal carcasses or humus, so the body surface, gills and gastrointestinal tract of crabs are full of all kinds of bacteria and sludge. Some people get sick because they haven't washed the crabs thoroughly, or because they eat drunken crabs or pickled crabs raw, and they eat germs or parasites in the crabs. ● Four places can't eat 1. Crab stomach: it is a triangular bone packet in the crab lid. Eat the crab cover first, take out the middle crab stomach with a spoon, and gently suck the crab yellow wrapped outside. Be careful, don't suck through the stomach of the crab with a triangular cone in the middle. There is dirty sand in it and it should be discarded. 2. Crab heart: After eating the crab cover, it's the crab's turn. First, cut off the extra crab feet and mouth with scissors. Pick out a hexagonal piece in the middle of the crab with a spoon handle, which is the heart of the crab and should be discarded. 3. Crab intestines: that is, a black line from the crab stomach to the crab navel should also be discarded. 4. Crab gills: that is, two rows of soft things like eyebrows that grow on the belly of crabs should be removed.