Live crabs can't be eaten if they freeze to death in the fresh-keeping layer, but they can freeze to death in the frozen layer. Because of the low temperature of the frozen layer, it can inhibit the crab from producing bacteria, and the toxic substances in the crab can not be secreted at low temperature. To tell the difference between a crab's life and death, just see if it can move.

Live crabs can't be eaten if they freeze to death in the fresh-keeping layer, but they can be eaten if they freeze to death in the frozen layer. Because the fresh-keeping layer can't inhibit bacteria or sterilize, crabs will secrete a lot of bacteria and toxic substances after they die here.

The low temperature of the frozen layer can inhibit the production of bacteria in crabs, and the toxic substances in crabs can not be secreted at low temperature, so crabs frozen to death in the frozen layer can continue to eat.

There are many ways to tell the difference between life and death of crabs. For example, we can try to press the eyes of crabs, and the eyes of live crabs usually retract. We can also take apart the rope that binds the crab and see if it will move.