You do know about US v OR, correct? https://www.fisheries.noaa.gov/west-coas...states-v-oregon

There is treaty tribal fishing in the Columbia that would impact the fish in this study as well, at least on their migration up to the Snake.

I would say the biggest difference between the fish in the study and the coastal fish is that Snake River steelhead are all summer-run fish and they have been in freshwater for a variable but certainly longer period that any of the coastal winters when they encounter fishing gear - freshwater hardened in other words. May make a difference in mortality?

I should say that that should not have any impact on the reduced encounter rate of wild fish, when fisheries targeting hatchery fish are present.