The survival problem for Chinook was that the fingerlings didn't make it at all. The yearlings, as with all yearling smolts that leave deep SS, got hammered. Maybe seals. But, how does the burgeoning seal population explain that the deep SS Searuns are doing just fine, and they are there all year (as are the seals)? Maybe it is particular seals in Tacoma Narrows. Maybe it's an expanding Lincod population in the Narrows. It was expanding when this first began. Maybe it's the expanding harbor Porpoise. I dunno, but we have to look at what is working and why to understand what isn't.