Can a crayfish live in lightly salted water?

I got a small tank with a fiddler crab and a little crayfish. I added the slopping hill in the tank for them to get to the surface but I also read that fiddler need salt in their water or they will die in a few weeks. Can my crayfish survive the saltwater? And would table salt work for salting the water? Thankyou So Much!