After buying crabs, wash the dirty things on the body surface first, and then soak them in light salt water for a period of time. The concentration of salt water should be slightly salty. The purpose of soaking crabs in light salt water is to make them spit out the dirty things in their stomachs, so it is necessary to change the water several times during soaking until the water spit out by crabs becomes clear.

When the water spit out by the crab is no longer turbid, you can start brushing. This step requires courage and certain skills. Pay attention to prevent the fingers from being pinched by the crab pliers.

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Crabs eat a lot of bacteria and viruses, but they are all suppressed by crabs' immunity. Once crabs are dead, they are not even dead, but dying soon, bacteria and viruses will multiply in large numbers and breed some biotoxins. So as long as you see crabs half dead and listless, you'd better not eat them.

Fresh crabs, very delicious. However, if the caught crabs die, the umami taste will be gone, and people may have poisoning symptoms after eating them.

Crabs live in water and like to eat dead fish, dead shrimp and other corrupt animal carcasses. After being caught, crabs often want to break free, resulting in an increase in lactic acid in the body, which will lead to the rapid proliferation of bacteria in the body after the death of crabs and spread to crab meat. Then, crabs will be infected with certain bacteria.