how did some freshwater fish like sturgeon end up in far-apart places (like the Great Lakes and Caspian Sea, for sturgeon) with no fresh-water path between them?
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Most likely transplanted by people from one body of water to another.
However the natural way that happens (non-human intervention) has to do with certain species of fertilized fish eggs are immune to being digested and when eaten by migratory birds, the eggs are present in their poop and if they happen to use the bathroom in or near enough to the water, the fish are born in the new environment.
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