It depends on the type of crab you are referring to. If it is a hermit crab, it will eventually die because hermit crabs need seawater (seawater contains iodine and other minerals that support the growth of the crab.) If it is a normal crab (the ones you eat and cook) it can adjust to the environment or the freshwater you were talking about. If crabs can live in land, so do they live in fresh water.
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