The suitable temperature for crabs is 5-30 degrees. When it is below 5 degrees, they go into hibernation, and when it is too low, they die. Crabs can't survive in the freezer because the temperature is too low (about-18 degrees).
Because orchids and crabs are fresh aquatic products, they can be kept for a short time after leaving water, so when buying, it is best to buy a quantity that can be eaten within 3 days. If you can't finish eating, you can temporarily tie the feet of the crabs, then put them in the freezer of the refrigerator and cover them with wet towels for preservation. When eating every day, choose the crab with insufficient vitality and sufficient vitality to continue to be preserved. Of course, the first thing to save the crab is to keep it alive, followed by keeping it fat and not losing weight.