Yes, there are many fish that either live in freshwater and go to saltwater to breed (e.g. European and American eels), live in saltwater but come to freshwater to breed (e.g. salmon) or move back and forth between the two (e.g. bull sharks).
There are sharks that can live in fresh water? Does that mean you can find sharks in rivers and lakes? I thought that was an urban legend?
Yes, they’re known as osmoregulators. Most osmoregulators are hatched in fresh water and then swim to the ocean where they spend most of their lives. When they are ready to reproduce, they return to fresh water areas to lay their eggs. They are able to do this through salt regulation done in the kidneys and gills. One common example of an osmoregulator is salmon.
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