Wild salmon smolts are also captured in downstream migrant traps, coded wire tagged, and released. Fins are not cut off as they are not hatchery fish. With the new wand that WDFW uses a missing fin is no longer an indicator of a tagged fish as it used to be - they just check them all. Anyway, I think the regs are pretty clear on releasing coho with an adipose fin, and those bozos are just ensuring that the season will be shut down sooner if they persist in killing unmarked fish