The Olive Dun Trout Flies are a must for your fly box all year round. Olive Dun Flies are found in rivers all over the UK and as the dun flies hatch all year you never know when you will need them. What Makes Dry Fly Trout Fishing Special: Dry fly fishing involves using artificial flies that float on the water's surface, imitating adult aquatic insects, terrestrial insects, or other surface prey.
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