Why does living in saltwater pose a challege for marine fish?

Question by poptartjelly: Why does living in saltwater pose a challege for marine fish? also; what are the adaptations used by marine fish to live in this enviornment? Best answer:

Answer by Mark V
The challenge of living in saltwater is that no living being lives on salt water. Not even fish. Every organism lives on fresh water. So fish have to cleanse their systems so that they don't shrivel like a snail that some evil kid has dumped salt on. As with people, maintaining the proper level of salt in the fish's body is
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