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.