If I wanted to really limit my impact on wild fish, I would just fly fish. On the rivers I fish, numbers are pretty stable. I've caught a couple dozen this year; have not had a bleeder or fish I suspected wouldn't make it. I think avoiding bait and using smaller hooks does a lot to limit impact. Hook size seems to get little attention in this arena, but I think it's a factor.

Wild steelhead are a superior sport fish IMHO.
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.