Crabs are crustaceans. They don't need much water, but they can't live without water. Generally, in the case of water shortage, the survival time of crabs does not exceed 24 hours. With the death time getting longer and longer, crabs will gradually release fishy smell, and the nutrients in crabs will continue to decrease.

If the bought crabs are soaked in water for a long time, they will die because of lack of oxygen in the water. It is suggested that the deep water filled with crabs should not be covered with crab shells, or the water should be changed every 30 minutes, 1 hour, which can make the crabs breathe smoothly and help to increase the storage time.

Extended data:

The omen of crab death.

1, slow response to exophthalmos. Live crabs tend to fold when touching their eyes with their hands, while dying crabs tend to protrude gradually without rotating.

2. Gradually stop spitting bubbles. Live crabs are very attractive, and sometimes they spit out a circle of milky hot bubbles, while lifeless crabs may not spit out bubbles easily.

3, shaking the crab did not respond. Break off the crab's navel and crab pliers. If there is a reaction, it is a live crab. If there is no response or little response, it means that the crab is probably dead.