The Atlantic salmon fly is large by most of fly standards. They are usually wet flies that range from a standard hook size 4 or 6 up to as large as a 4/0 hook size. These large flies are used most often when the water is high and off color. Recent years have found anglers preferring smaller flies than normal, especially during the clear. low water conditions of Summer. It’s not uncommon to see Atlantic Salmon flies in hook sizes as small as 10’s and 12’s. There’s not any hard and fast rules for this. Most of the wet flies are fished a about a foot to three feet deep. It depends on the current. There’s always a preference as to color; however, I’m not sure whether it’s so much the fish’s preference or the angler’s preference. Most anglers go by the old “dark flies for dark days and bright flies for bright, clear days” rule. Flies vary from bright greens, oranges and yellows to black, dark drab colored flies.