marine mixed stock fisheries on non-adults-ocenan sport, ocean troll, bycatch in trawls, squid gillnets, and such is what is taking away the old fish.

The reduction in Chinook size,and the causes of same, were recognized when i was college (Noah was my fisheries prof).

The first step to recovering the Yukon Chinook size, or the Elwha Chinook size, or the Skagits, or anywhere is to quit killing them in fisheries until they are mature and stopped feeding. Then, of course, letting enogh of them spawn to support the run.

The solution is equally as simple. Stop fishing for these fish on their feeding grounds. Wait until they reach their terminal age/size at maturity before initiating harvest.