I too want to perserve the fishery as well, and I think the F&G do as well. My Question is If the single hook is mor of a danger to the salmon then why did the F&G start making us use just a single hook when fishing with live bait?

Using a treble hook for bait is a no no because usually the fish eats the hook and bait, swollowing it. Single hooks like a circle hook are better for a lip catch. While trolling having multiple hooks causes more chance for hook wounds, where a single hook is either a lip hook or a miss.