2. After the crab is steamed, it can be eaten as long as it is scientifically and reasonably preserved and does not lead to deterioration. The time spent overnight generally refers to about 8- 12 hours. During this period, as long as the crabs are kept in a low temperature environment, the crabs will not deteriorate basically, so they are basically edible. However, it should be noted that crabs are inedible when they go bad. Even if they are eaten overnight, they must be cooked at high temperature before they can be eaten, so as not to cause adverse reactions such as diarrhea.