Salt water adaption

[PJ_Marley]

I know some fish can be adapted to brackish water, but what I want to know is if any fish or invertebrate can be adapted to salt water completely without a great deal of stress. If there is any would they be able to reproduce normally or at all. This is just for the sake of curiosity as I have neither time nor money to do this.

[leebca]

The short answer is, 'Yes.' There are some brackish and even freshwater tropical fishes that can adapt to salt water, although the lower salinity within the 'normal range' is best for them. As to reproduction, I don't know, but assume that since they do exist in the wild, they must be reproducing.