1, touch your eyes.

Living hairy crabs contract when they touch their eyes, while dead crabs usually stick their eyes out.

2. See if you spit bubbles.

If the living hairy crabs are energetic, they will spit out small white bubbles, while the crabs with poor spirits may not have this feature. This method must be observed more to distinguish the life and death characteristics of hairy crabs.

3, untie the rope to see the state.

If there is no response when touching your eyes, you can untie the rope tied to the crab and put it on the table to see if it can still crawl or extend its claws. Without this feature, it means that it is dead and must be discarded.

Extended data:

Dead crabs produce a lot of histamine. People will get histamine poisoning if they eat dead crabs.

Because histamine is an allergic poison, it can also be said to be allergic food poisoning. Don't think that just eating a little dead crab meat doesn't matter. People who are allergic to histamine can cause a reaction even if they take a bite.

For example, after eating dead crabs for 65,438+00 minutes to 3 hours, there will be symptoms such as cheek redness, flushing of chest and whole body skin, conjunctival congestion, headache, dizziness, chest tightness, general fatigue, irritability and so on.

Dead crabs must not be eaten. Another important cause of poisoning due to dead crabs is bacterial infection.

Generally speaking, the living environment of wild river crabs is not as good as artificial and sea crabs. Once they die, bacteria in and out of the body will multiply, decompose crab meat and produce toxins. Relatively speaking, the risk of bacterial infection is higher, and people are more prone to bacterial infection after eating it.

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