If I read Curt right, Stilly fish have an R/S less than 1. The fisheries can't be reduced any more, as this won't increase the R/S to above 1.0 . The habitat restoration hasn't worked, as the R/S and total run continue downward.

The run, then, by the best measures we have, extinct. Just admit it and move on. We have had 20+ years of doing the "Best Science" to have the fish runs decline by 30%. They're extinct.