It's my first salmon season, so don't have much in way of context, but some of the handling of wild coho I saw in the tidal Fraser (Richmond, New West etc) was pretty shocking. I personally saw three or four go belly up, flopping around on the gravel or beach for a couple of minutes, stuff that could have easily been avoided with a little care. And these were big beautiful chrome wild coho.
Of course, I indadvertantly killed a wild jack that was deep hooked, so I can't really point fingers. Next time I know just to cut the hook.
Now those chums, those are tough fish. Also a big fan of the "Bent Rod" jigs and their sickle hooks, almost every hookup has been perfectly hooked on the mouth. Easy to release and almost always a solid hookset without much effort from me.
I"m not sure if it's due to the sickle hook or that's the way jigs are with chum. I"m going to try using sickle hooks and jigs for next years coho. They seem much more delicate fish than chum.