Rehabilitation work isn't really done in the main stem of a river to my knowledge, I could be wrong I'm still in training myself, but the reaches ghat I've worked in wouldn't be very good for fishing. They are difficult to reach and very cramped or on privately own logging land.

They are being turned into spawning grounds for salmon near the end of their life cycles.

Sadly one of the biggest problem I've seen is exactly what you point out despite our efforts to save them people refuse to stop fishing for them and it would be next if not impossible to change the laws regarding them do to special interest groups.