1, put it in the freezer and cover it with a wet towel for a few days. Touch the crab's eyes with your hands, and the dead crab will be the one that doesn't respond.

2, put it in a bucket, but the height of the water should not pass the crab's body, otherwise the crab will die of lack of oxygen. It is better to have a bathtub at home, because the bathtub is smooth and crabs can't climb out.

Extended data:

1, precautions for eating crabs:

Choose fresh and live crabs instead of raw and drunk crabs. Crab is an omnivore, and even eats the corpses or humus of other animals. Its body surface, gills and gastrointestinal tract are covered with all kinds of bacteria, sludge and even parasites. Therefore, before eating crabs, you must scrub them clean, do not eat gills, intestines and other internal organs, and you must steam and cook them thoroughly before eating them.

It is not advisable to eat too much. Protein contained in crabs and cholesterol contained in crab roe are relatively high, and excessive consumption at one time is not conducive to human digestion and absorption, so the average person should not eat crabs more than 1 kg at a time, and should not eat crabs more than three times a week.

2. How to buy crabs

Look: The crab's back carapace is blue-gray, shiny, its abdomen is white, its color is bright, there is no imprint on the upper part of the navel, and its limbs are firmly connected in a curved shape.

Weighing: For the sea crabs whose appearance meets the requirements by eyes, weigh their weight one by one, and the ones with heavy hand feel or heavy weight are called fat crabs.

Peeling: Peeling off the umbilical cover of the sea crab. If the crab yolk condenses and forms in the shell, the crab is a good crab.

Pull: The legs of the sea crab are all intact, and the legs of the crab are slightly elastic, indicating that they are fresh sea crabs; If the crab is not fresh, gently pulling the crab leg will not only have no weak force, but also the crab leg will easily break off.

Smell: If you smell the fishy smell of sea crabs, it means that the sea crabs have gone bad and can no longer be eaten. Eating spoiled sea crabs can easily cause food poisoning.

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