Crabs can't be eaten when they are dead. Crabs love rotten food and accumulate pathogenic bacteria and toxic substances in their bodies. Dead crabs can quickly breed a large number of bacteria and are not suitable for eating, especially when the weather is hot. Cooked crabs are best eaten on the same day, so don't keep them.

Crabs should be eaten raw, but dead crabs should not be eaten: the rigidity period and autolysis period of crabs after death are greatly shortened, and bacteria in crabs will multiply rapidly and spread into crab meat. Fresh crab shells are bluish-black, shiny, with full navel and Bai Jie abdomen. But the shell of the dying crab is yellow, and the crab's feet are soft, so it is difficult to turn right.

Tips for identifying the freshness of crabs;

Pick up the crab and touch its eyes to see if it blinks, which means it is still alive.

2 put the crab into the water to see if the crab's mouth will spit bubbles, which means it is fresh. Be careful not to put the bound crabs into the water for a long time, because the crabs will suffocate and die quickly because of lack of oxygen in the water.

3 touch the crab claws. Straighten the smallest crab claw to see if it can bend quickly and naturally. If you can, the crab is alive.

(4) untie the bound crab and see if it will crawl on the ground. Crawling means that the crab is full of vitality.