Most "salties" can't reproduce in freshwater because it takes more energy for them to survive in freshwater.....same principle that allows bullsharks to live in freshwater, they adjust the amount of urea they excrete so that they do not absorb too much water....but, it takes more energy to do this, and that is why they generally can't reproduce in freshwater...its a lot of chemistry that I dont want to bore anyone with, but that would be my best explanation for the phenomenon...
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