Diawl bach ,Black and Blue #12/ D38

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Meaning "little devil", the Diawl bach is a popular Welsh fly pattern used in British still waters, and an appropriate lure to use when the fish are feeding on  pupae.Thedressing is simple: size 8 to 14 hook, brown thread, a few barbs of brown hackle for the tail, copper wire, a few barbs of peacock herl for the body, and tying thread for the head.

Variations include jungle cock substitute cheeks, red-head, hare's ear for the body and flash materials on the back.

Fish as one of a team of three flies drawn slowly on a dry line with a long leader. A particularly effective method is to let the wind push the floating fly line around and look for a twitch in the line as indication that a fish has taken the fly.