After the crab dies, if it can't be frozen immediately and kept at room temperature for several hours, don't eat it any more. If the specific time of death cannot be determined, it is best not to eat it for safety reasons.

Why can't dead crabs be eaten?

1, the histamine produced is harmful to human body.

When the crab is dying or dying, the parasitic bacteria in the body will multiply rapidly, spread into the crab meat, decompose the protein in the crab meat, and produce histamine. The longer the crab dies, the more histamine will accumulate in the body. Histamine will cause telangiectasia and bronchoconstriction, which will cause certain damage to the kidney. Even if the dead crab is cooked, histamine is hard to be destroyed. After eating, it will cause nausea and vomiting, flushing on cheeks, rapid heartbeat and other symptoms, and may also induce abdominal pain and diarrhea.

2, affecting the taste: the crab stinks before it dies. "

Crabs lose their original flavor when they die. After the crab dies, the intestinal gland will soon fall apart, and histidine and digestive enzymes in it will disperse and decompose the crab meat. Therefore, the taste of dead crabs is strange and the taste is greatly reduced, which is why it is said that "crabs stink before they die"