I have to admit that I really don't understand classic salmon flies. Many of them are beautiful and tying them can truly be called an art form. I am a trout fisherman - trout flies at least suggest some prey item...insects, crustaceans, other fish. At least to my eyes, salmon flies resemble very little in nature, not anything that a fish would normally eat. Do they just piss salmon off to the point that they bite them? Or are there things like color combinations that "trigger" feeding? I have absolutely no idea. Trout fishing is puzzling enough for me!