[ELi5] How do fish get in lakes/ponds when there is no inflow of water
In: Biology
There is a lot of doubts fish eggs sticking to the feet and feathers of waterfowl. Maybe it occurred, maybe it didn’t a lot of it is unproven. Some fish eggs have even survived going through the gut, and viable eggs have been hatched from duck poop in a lab.
The most common answer is modern lakes and rivers might have been interconnected during prehistoric floods and ice ages.
And in the case of some species like trout, it’s because humans brought them there. Brown trout are pretty much all over the world. For example, upstream of the waterfalls in Yosemite, Europeans either hand carried buckets of fish, or on packed mule/horse trains. As a way to store food they could later catch.
Today, all over the world, various government agencies stock fish for recreational fishermen, transported on tanker trucks or even released from helicopter and airplane.
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