1, according to the color, the back of the dead crab is dark red and the abdomen is gray after cooking, while the fresh crab is bright red and the abdomen is bright white.

2, smell, after the dead crab is cooked, most of them will have a smell different from the fishy smell of the sea.

3, pinch, the shell of the live crab is very hard after it is cooked, and it will not be recessed by hand pressure. The shell of a dead crab is so soft that it can be pressed by hand.

4. See if its leg has fallen off. Because the living will struggle when cooking, and their legs will fall off easily, but the dead will not.

5. The meat of the live crab is a little bit, the clam shell is peeled off, the crab meat is white and tender, and the entrance is instant. The dead meat is scattered and a little burnt.

6. The meat in the dead crab clip is constantly caught by chopsticks, so it is difficult to break it open by hand. Bite down with your teeth, like chewing rubber, and the film on the outside of crab meat can only be torn like paper. After tearing the film, the color of crab meat is yellow-brown from the inside out.

Extended data

Harm of eating dead crabs: most river crabs grow in dirty ponds and like to eat dead fish, dead shrimp and other corrupt animal carcasses. Therefore, they are easily infected with bacteria. Generally, crabs are stained with a large number of microorganisms inside and outside. When a crab is alive, it can excrete bacteria through metabolism, and once it dies, the bacteria in the body will multiply and decompose crab meat, and some bacteria will also produce toxins.

In fact, the poison hidden by dead river crabs is far more than that. Crabs also contain more histidine, which is easily decomposed and can produce histamine and histamine-like substances under the action of decarboxylase. Especially when crabs die, histidine decomposes faster. The longer the crab dies, the more histamine accumulates in the body. When histamine accumulates to a certain amount, it will cause poisoning if eaten.

People's Network-Health What You Need to Know: Can Crabs Eat After Death?