Selecting for large hatchery broodstock seems like a good idea. I doubt it would have the desired effect, however, because regardless of genetics, chinook take several years to mature, which requires them to survive multiple fishing seasons. I'd argue their ability to survive 4 and 5 years of relentless fisheries is a bigger factor in shrinking average size relative to genetics.

Still, I like the approach of proposing simple solutions that won't require controversial policy changes. The cumulative effect of trying all the quick and easy solutions should amount to at least something at the end of the day. I wish we could do more, but for now, I think this is the best approach.