Thanks Bobby, from my understanding they do need salt to breed but it does not need to be as high as salt water. They live from fresh, to brackish, to salt water but can only reproduce where salt is available. So the female migrates to an area where the salinity raises to brackish or higher. At least that was from the sources that I read. But the salt level is not an issue. I can always raise the salinity. I would rather remove all doubt that the water is where it should be for mating
