Size Matters When choosing trout flies, the relative importance of fly characteristics in your selection, in order, should be: size, shape, color, and action (for stripped flies). In saltwater, action is often more important than exact size and shape.
Dropper Flies or Tandem Rigs Dropper flies are a trout angler’s secret weapon. A simple dropper rig can be made by tying a small nymph onto 14-18 inches of tippet material tied to the bend of a dry fly. If the trout takes the nymph, the dry fly serves as your indicator. Nymphs can also be tied in tandem, enabling you to find out which nymph is working better.
Wet vs. Dry A fly’s construction determines whether it will float above the surface (dry flies), ride partially or completely submerged (emergers), or sink (nymphs and streamers). Fish expect their food sources to be in a particular part of the water column, and knowing where that is is important key to good fly selection.
Fly Color: Think Seasonal Don’t know where to start with your fly selection? Think first of seasonal color patterns. Early spring, late fall, and winter flies tend to be darker, matching the colors of their environment. Lighter flies typically appear in warmer weather.
Imitation vs. Flattery Fishing flies can be either impressionistic or exact imitations, and their effectiveness often depends on how selective the fish have become due to food availability, weather conditions and fishing pressure.
Think Subsurface for Trout At least two-thirds of the diet of trout is made up of subsurface food sources. Even if you prefer dry fly fishing, knowing what nymphs, larvae and crustaceans are available beneath the surface with help you decide on fly selection.