1. Dead crabs in the refrigerated layer are not suitable for consumption. The temperature of the refrigerated layer is not low. A few degrees above zero can ensure the freshness of the food and keep the food fresh. Therefore, the refrigerated layer is not antibacterial or sterilizing. After a crab dies, a large number of bacteria will reproduce in the body, and histamine will be secreted in the body. Histamine has toxic side effects. Therefore, dead crabs placed in the cold storage layer of the refrigerator should not be eaten.

2. Dead crabs in the frozen layer can be eaten. The temperature of the frozen layer is relatively low, usually below zero, and the food can be frozen. It has an inhibitory effect on bacteria and various enzymes. Put the crabs in the freezer The crab layer will soon freeze and freeze to death. In this case, the crab is frozen to death. Bacteria will not be produced in the body, and histamine cannot be secreted at low temperatures, so it can continue to be eaten.