When the crab is dying or dead, the oxygen acid in the crab will decompose to produce histamine. Histamine is a toxic substance. With the extension of the death time, more and more histamine is accumulated in the crab, and the toxic gas is getting bigger and bigger. Even if the crab is cooked, this toxin is not easy to be destroyed.

Sea crabs are raised in sand, so the crab gills are white and there is no mud, which gives birth to the black gills that have lost their appetite.

Nine times out of ten, sea crabs are dead and frozen for sale. Eriocheir sinensis should pay attention, there are many parasites.

Therefore, fresh or frozen dead sea crabs are no problem, and they can be eaten when they are dead, as long as they are fresh. River crabs are not allowed.

This answer is recommended by Hao Jianyu, an expert in entertainment and leisure classification.

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