system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do freshwater fish naturally occur in small isolated ponds and streams?

How do Fish like bass, trout, bluegills or any non migratory fish like salmon get to small ponds and streams that have no outside access?

I hope I explained my question well and don't sound stupid.
gpt
Ducks and herons feed in shallow water. As they are feeding, fertilized eggs cling to their feathers and feet. As they go about their day they stop at various water spots, transferring the fertilized eggs into a pond or stream that previously had no fish.

It would only take a few eggs to start a new population.