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If some salmon group had been simplistically "programmed" to go up these waters, they would have been trying and failing to go up the river during the entire time the dam was there and so likely wiped out as a group/subspecies.

It seems like the fish would have to have had some kind of way to test if the river lead to adequate spawning grounds. And if they had that, they wouldn't really need any memory of any given river.

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cutemonster 4 days ago | parent [-]

Another comment says that some salmons (a small fraction) swim up the randomly "wrong" rivers, instead of back to where they were born.

So, a bunch of salmons have been trying each year in the river with that dam? But:

"hundreds of salmons failed to swim past a dam"

didn't break the news

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jimnotgym 4 days ago | parent [-]

No. Thousands have been entering and spawning all these years but below the dams. Now the dams are gone some are spawning higher up the river. Not really suprising that they spread out a bit into new habitat, is it?

	▲	cutemonster 3 days ago \| parent [-]
		But that's what I wrote? > > swim up the randomly "wrong" rivers And the reason for that is discovering new habitats. But the other comment I referred to, mentions this already so I left that out. Didn't know about this though: > spawning all these years but below the dams. I thought, however, that it'd been funny if such a non-event (the fish didn't ...) had been in the news.