I would agree with the above comment that our knowledge of what WDFW calls Dolly Varden/bull trout is evolving so rapidly that Behnke's book, while accurate at the time he was writing it (pre 2002), is not up to date. Some of his statements are highly qualified, "Large, silvery char known from Puget Sound that run up tributary rivers are probably bull trout" (p.319). He states that "The Skagit River has the highest known incidence of bull trout x Dolly Varden hybrids, probably stimulated by its human-induced modified environment." (p.297) Anybody know what study showed this? I was under the impression that, as is true of the Peninsula, Dolly Varden in the Skagit drainage occur mainly, if not entirely, above barriers insurmountable to bull trout.