Do crabs need sand to live?

Answer 1

There are different rumours about this, however, crabs are said to be omeosmotic euryhaline (can tolerate wide ranges of salinity by maintaining constant the body fluids concentration), but quite different waters will surely shock and kill them. This really depends on the crab species in question, and also what you mean by ocean water. First, if you mean full strength sea water, most crabs can tolerate less saline water, and even adjust to changes in salinity. But as a rule of thumb, you need to consider the natural habitat from which the crab originated. If it came out of the ocean, it should stay in full strength sea water. If it came out of an estuary, it can tolerate less salt, and probably changes in salinity also, particularly if the estuary experiences periodic changes in tidal height. But extreme changes in salinity, especially if they are sudden, are likely to shock and kill a crab, as the previous commenter noted.

Answer 2

yes they can stay out of water for 9999 hours

Answer 3

No It digs into the sand to hide from predators

Answer 4

Not nesacarly. Crabs techinically need sunlight for the plants that there prey eat to be drawn near them. In this way they need sunlight but don't actually need it for themselves.

Answer 5

the crab needs the salt water