Title is self explanatory. Do freshwater fish ever accidentally find themselves in brackish or saltwater? How do they deal with that?
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They can when there are floods, storm surges, or other special situations, but other than that they avoid salty water as they’re not evolved for it and prolonged contact will kill them.
Certain kinds of fish spawn in one type of water and migrate to the other though.
Catadromous fish spawn in salt water, then move to fresh water for their adult life (eg. certain species of eel). Anadromous (like salmon) do the opposite, they spawn in freshwater and move to salt for their adult life. The overall term for these types of fish is Diadromous.
– https://www.encyclopedia.com/science/news-wires-white-papers-and-books/catadromous-diadromous-and-anadromous-fishes
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