2. The reason why crabs can't be eaten when they are dead: according to the habits of crabs, dead crabs are not recommended to eat. Crabs love to eat decaying food and accumulate pathogenic bacteria and toxic substances in their bodies. Dead crabs will quickly harbor a large number of bacteria in their bodies, so they should not be eaten, especially when the weather is hot.
3. In terms of taste, crabs lose their original fresh flavor when they die. There is a histidine in the crab body, histidine is easy to decompose, can be produced under the action of decarboxylase enzyme histamine and histamine-like substances, after the crab is dead, the midgut glands will soon fall apart, inside the histidine, digestive enzymes will be scattered out of the crab meat will be decomposed. Therefore, the dead crab taste strange, taste greatly reduced.
4. The crab itself is non-toxic, but after the crab is dead and the crab's shell is broken, the protein in the crab's body will harbor bacteria.