I have a hunch based on what is missing from some coastal runs- mid-sized 'bulk of the run' chinook. we know these fish can come back at 3, 4, 5, and even 6 years. seems to me the fish some systems are missing include jacks and 16# to 22# 'bulk of the run' nooks...is it possible that better ocean conditions are keeping a good chunk of the run out in the ocean for another year?