I’ve never gotten the full explication on this. I hear animals bring the eggs, esp birds but that doesn’t really make sense to me. Don’t the eggs need to be fertilized in the water?
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In the modern day, and for a lot of human history? People. People like to fish, and they like to have fish in their local body of water. So they go to a body of water that has fish, they catch some, and they bring them to another body of water and put them in.
In modern times, there are fish farms that exist almost entirely to restock lakes and rivers with popular fish in order to attract tourists.
There are some ways this can happen naturally as well though.
For one thing, very few bodies of water are completely isolated. If they were, they’d usually dry up, or turn into a salt lake. Many lakes have temporary streams in and out during the wet season. This can be enough for fish to swim into them.
Another is birds. There’s speculation that some birds can accidentally carry fish eggs on their feathers or even pick up whole adult fish they intend to eat, and then land or drop them into an isolated lake. This probably doesn’t happen very often, but it’s a legitimate theory of how some fish can move from lake to lake.
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