I'm glad to see a new angler already being torn by an ethics question. It shows that you are intelligent and that you care about the resource.
To help you make your decision, here are some facts:
- Whenever there's fishing, there's a risk of bycatch.
- Bycatch, by its very nature, contributes to a fishery's decline to a certain extent, even if the fish is released, for not every fish survives an encounter with an angler. Therefore, bycatch is a mechanism for overfishing.
- Coho gear is generally lighter than that used to target chum and springs, so playing an accidentally hooked chum with coho gear likely puts unnecessary strain on the fish, the same fish whose wellbeing is creating your moral dilemma.
- The Stave river, this time of year, is mostly populated by pre-spawning and spawning chum, with a few coho in the mix.
- Everything coho like, chum like, too, so targetting coho efficiently on the Stave this time of year without producing chum bycatch is impossible, regardless of the water you fish and the method you use. (the same holds true for other systems, but your question relates to the Stave specifically).
- Ethical anglers stop fishing when the risk of bycatch of a species at risk is high.
Taking all the above facts into consideration, what do you think?
Is it ethical to target coho on the Stave this time of year only to satisfy your yearning for a tight line?
Good luck with making your decision; it's hard to deal with these dilemmas when you crave a fish at the end of your line so much.