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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The eggs are eaten by galliforms, ducks, swans, geese etc. and pooped out. It was thought that they could not survive the stomach acid however this has now been proven to not be the case.
Also fish that give birth to live young are less likely to occur in newly created bodies of water.
https://www.smithsonianmag.com/smart-news/these-fish-eggs-can-travel-through-swans-digestive-system-and-emerge-intact-180972426/
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