Premium Quality Streamer Flies, Zonkers, Muddlers and Marabuts Flies Shop. Streamers are mainly used for trout fly fishing. Most our streamers flies imitate small fish and are often used to target large predatory fish: Trout, Sea Trout, Salom, Steelhead, Striped Bass, and other predator fish that prey upon small minnows. Streamers can be used in fly fishing in still waters (lagoons, lakes, ponds) as well as in creeks and rivers. Stramers sold in our online store are made of the highest quality materials.