Nymphs are aquatic insects that are still in their underwater stage, not having reached their adult, or flying, stage of life yet. Trout have a diet that consists primarily of sub-surface insects (nymphs).
A key to using nymphing as a successful fishing fly is being able to know how to get your nymph pattern to the right depth. Therefore it is important to make accurate casts with these trout flies, so as to allow the nymph to sink to the right depth where you believe the fish may be!
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