1, hairy crabs live in the water, is a carrion animal, itself carries many harmful bacteria, so cooking time must be cooked through.

2, dead or dying hairy crabs because of the collapse of the crab's own immune system, the bacteria will multiply and invade the crab's body, decompose the amino acids contained in the crab's body, and produce a harmful substance "histamine", "histamine-like", which can cause vomiting, vomiting and other symptoms. "This will cause vomiting, abdominal pain and diarrhea, and these two types of toxins cannot be eliminated by high temperature. Therefore, dead hairy crabs are not edible.