The chenille pupa is a caddis pupa tied on curved hook (Firehole 315 or Ahrex 525), body of Floatant Chenille, squirrel dubbing and a partridge hackle. An outstanding fly tie that sits right in the surface film to resemble the real thing.
One of Simon Johansson's absolute favorites for fishing in both fast and still water.
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Tip:
To more easily see when the fish takes the fly in fast water, tie it approx. 20-30cm into the hook bend after a high floating fly, e.g. Goddard Caddis