Dolly Varden vs. Bull Trout

I'm not sure what document you're referring to, but let me give you some background on bull trout/Dolly varden in Idaho and how the name has changed over time - at least in Idaho. "Bull trout/Dolly varden" are members of the Salmonidae family.  They are native to Idaho and have actually been cultured, reared and stocked at various times from our State fish hatcheries.  They are aggressive fish eaters, almost exclusively, when they reach between 8 - 12" in length.  For this reason, they are extremely vulnerable to angling.  Any plug or lure that mimics a fish will attract bull trout. The American Fisheries Society is the professionally recognized entity that names fish throughout the world.  Prior to the early 1970's the names "bull trout" and "dolly varden" referred to the same species of fish.  In early 1970, the American Fisheries Society split the species and began referring to fish that migrated to the ocean (anadromous) as "dolly varden" and the resident form that spent their entire life in freshwater as "bull trout."  Because none of our Idaho fish migrate to the ocean, we now call all Idaho species "bull trout" and "dolly varden" are the coastal run group of fish found in western Washington, Oregon, California, Canada and Alaska.  "Bull trout" are now recognized to inhabit Idaho and parts of northern Nevada, Montana and other areas cut-off from the ocean by barriers.