As long as the preservation method is correct, crabs can be kept overnight. You can put crabs in tall plastic buckets with smooth inner walls. Be careful not to stack them. Just add the water to half the height of the crab, and you can't drown it all.

If the weather is hot, it's best to put it in the refrigerator, so that the crabs at noon can be kept until the evening, but not overnight. If you want to store boiled crabs for a long time, such as overnight, you should put them in the freezer. However, direct freezing is easy to make boiled crabs lose water and become very dry and unpalatable. When frozen, it can be frozen with the soup of boiled crabs, which can better maintain the umami taste of crabs.

Shopping tips:

Common sea crabs are swimming crab, snow crab and blue crab. Among them, the snow crab basically died outside the water after being caught, and the swimming crab can be cultured artificially. Portunus and snow crabs have good food quality and growing environment and can be eaten after death.

When choosing, choose fresh ones. The back shell is blue-black, shiny, the navel is full and the abdomen is white. Blue crabs dig holes at the bottom of sediments in shallow seas and estuaries near the coast. It is a carnivore, and sometimes it eats rotten small animals.

Once dead, there may be toxins in the gastrointestinal tract of the blue crab and spread to the muscles, so the dead blue crab is not suitable for eating. After buying it back, it is best to put the blue crab in clean light salt water for temporary cultivation and purification, which will help clean up the digestive organs of the crab.