Well we could argue for years on hooking mortality and what studies to use but I like the canadian studies on steelhead because they are the most similiar to the fishing I do but in that case thoes using barbed hooks, treble hooks or bait should be paying a far greater share because thats where almost all hooking mortality comes from. I fish all barbless all singles and no bait since i have been doing so i feel extremely confident in saying that i have killed 0 wild fish and threfore have had 0 impact and should have to pay nothing.. ( if your going to base it off impact)