Where I live, it’s barbless single hooks. They claim a 1-5% mortality rate, higher when water temps are higher. Some might call me nitpicking, but there are 3 major guide services that put a chit load of people on the water mid June-September. A lot of vulnerable cutthroat are floating belly up down that river system.
I got no love for trout fishing outfitters in MT. I'm sure they're nice people or whatever but they're hell on public fishing.

