So, do smaller king salmon usually jump more than larger kings as a rule vs. the other Puget Sound river’s kings, or just the Green River /Soos and Keta Cr. hatchery king salmon ? I assume they do this to acclimate from salt to fresh water living ?

I’m not an Elliot Bay Salmon Fisher, spending most of my time around the Puyallup Terminal areas, and Commencement Bay, where one can find three differing fall salmon in the C bay at the same time. Pinks, Coho, and Kings in late August -1st of September, and they all would show- jump, but looking back in time, Pinks would be all over the bay rolling and jumping, the Coho and Kings closer to the River mouth, and a lot more Coho than Kings jumping ? We just thot it was a numbers driven game ?

Now back to the Chehalis, my tiny brain hurts ....

The easy answer, and I have absolutely no data to support it, is that it is numbers driven. Say 1% of the fish jump. You have a million pinks, 50,000 coho, and 10,000 chinook.

I do remember that some bios in the 60s and 70s used "jumpers" as a way to evaluate run size. So that gives credence to the idea.