To add on to what cohoangler said above, back in the 80s the Puyallups fished the bay and river 24/7 during the coho run. Add on the sport fishery in the river and all the previous fisheries and that is a lot of effort. WDF still ended up with way more coho at the hatchery than needed.

It has been talked about a lot here, but eliminating the marine mixed stock fisheries will move harvest to bays and rivers and generally increase net harvest as there is a limited window to harvest.

But, elimination of the hatchery production, and its associated 90+% harvest rates would mean that there would be more fish in the rivers but most would be needed to spawn, so a reduced harvest rate would fit in with wild management in the terminal areas.