7 The choice of fly is not the most important factor for successful salmon fishing and I recommend relying on fewer patterns. Too many of us have boxfuls of different flies and, as a result, most of us have no idea what to put on. A predominantly black pattern will score in most situations. Carry it in many sizes, from micro to large Sunray Shadows. Also, fish Willie Gunncoloured patterns in peat-stained water, and try an imitator fly, like the Frances. As the phrase goes: Keep it simple, stupid.