Blue tube fly
A tube fly is a general tying style of artificial fly used by fly anglers. Tube flies differ from traditional artificial flies as they are tied on small diameter tubes, not hooks. Tube flies were originated in Aberdeen, Scotland by fly-dresser Minnie Morawski for Atlantic salmon anglers around 1945. Tube flies were designed to improve hooking success and to prevent damage to complex and expensive salmon flies by the teeth of hooked salmon. Tube flies have been widely adapted to fly patterns for a variety of cold water and warm water species and are extremely popular for steelhead and salmon in the Pacific Northwest and northeast United States, as well as saltwater species along the Atlantic, Florida and Gulf Coasts. They are widely used in European waters for Atlantic salmon, sea trout and pike.