The crabs can live for 2-3 days after they are out of water if they are not specially preserved usually not more than 24 hours in summer, fall and winter if summer.

Crab is a crustacean living in shallow water, the need for water is not so strong, and too much water is also easy to make the crab lack of oxygen and drowning, the general will be placed in a waterless environment, the survival time is not more than 24 hours, time is too long, the crab is prone to death, the body produces histamine and other harmful substances, should not be eaten.

Expanded information:

Hairy crabs can't live in water with too little oxygen. If the hairy crabs are kept in the water without flow and oxygenation, when the oxygen is slowly depleted, about 4 hours later, the hairy crabs will die because of the low oxygen content, if the oxygenation is carried out, the preservation time can be a little longer.

Hairy crabs, if the storage conditions are not good, the dying state of the longer time, the body will appear a large number of histamine and cadaverine and other substances, consumption is not good for the body, so it is best not to long time to save the hairy crabs, buy back to eat quickly.