In a discussion I have had with some Canadian colleagues about they have with mismanagement on the Skeena, Thompson and actually the rest of the province, is that O. mykiss will probably survive as residents but the anadromous segment will essentially vanish. Mykiss seems to be able, as a species, to recognize what works best for species survival. If migrating to the ocean is a bad decision, they stay home.

The most extreme examples I have heard of came from the central/southern CA coast where century long drought dried up the lower reaches of streams which prevent smolt migration out or adults back. So they stayed in the headwaters until the water returned and then they went back to anadromy.

If you look at estimates of what used to return (non-WDFW sanctioned numbers) there used to be huge runs of steelhead which we now have reduced to crumbs. And we are not trying to get the whole loaf back, just a few more crumbs.