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?

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.