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Comment by wil421 | Hacker News Reader

Lakes have connected rivers and streams that provide paths for fish and eggs to move around. There are human and animal activities that affect this. Your bird example and beavers causing floods could allow movement.

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Isolated alpine lakes do not have connected rivers and streams, yet a ton are stocked with fish by humans.

Is it unbelievable that ancient hunter-gatherers would do the same thing?

A lot of people are unaware of how much husbandry hunter-gatherers still did. They may not have been farmers, with field plantings, weeding, and harvest seasons designed to maximize every acre under production, but they weren't stupid and still spent time to bend the world around them to the task of providing them more resources than it would have on its own. On a bang-for-the-buck basis they often did better than the farmers, it's just that without farming you can't get that density and net return.

This looks like a good overview paper for interested folk: https://pmc.ncbi.nlm.nih.gov/articles/PMC3048989/

We are on the same side. I’ve been trying to show the difference between natural water processes and some else like birds or humans spreading fish.

So many lakes do not have rivers flowing in and out. A low spot in an area will become a lake.

Many do have rivers; many don't. Ponds even more so don't have attached rivers.

Many ponds have seasonal streams. In spring (when the snow melts) they get connected to the local river system by a shallow stream, then when the water levels go down the stream disappears but the pond remains. Also beavers may flood a large area, then move on leaving a formerly connected pond isolated again.

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