March Brown Sparkle Dun by Steve Yates
Hook: Favorite dry fly, size 12/14 this one is a TMC 100 size 12
Thread: Uni Rusty Brown 6/0
Trailing Shuck: Zelon or Antron
Wing: Med natural Costal Deer
Body: Superfine March Brown dubbing
The Sparkle Dun is one of those patterns that has evolved over time from a compilation of ideas from many different tiers and patterns. Essentially, the fly is a Comparadun with a yarn tail that represents the shuck the dun has just emerged from. It's a clever and deadly variation. Fran Betters' Haystack and Al Caucci and Bob Nastasi's Comparadun are very similar type patterns, and were most likely the inspiration for Craig Mathews' and John Juracek's Sparkle Dun. Why does it work so well?
Because a dun that has just emerged from the shuck has to dry its wings before it can fly off. The dun floats helplessly before it can become airborne, making it an easy target for a surface-feeding trout.
March Browns typically hatch at the surface in slow moving water. The nymphs are of the clinger type and are very adept at life in the fastest flowing parts of the stream. They move from the riffles to slower water as they near maturity and will often be found adrift just prior to the hatch. The Sparkle Dun is a good slow water fly, but due to it's lack of hackle it doesn't float very well in the faster sections of the stream. What I like to do during a hatch like this is to find a riffle that empties into a slow moving pool. Fish will often stack up right at the drop off as the hatch starts while taking the nymphs. By the way, a Hare's Ear makes a fairly good imitation of the stout bodied nymph. As the hatch progress the fish will spread out in the back eddies and slower water waiting on the dun to emerge. The duns will often flap their wings and make a couple of false starts before being able to get airborne. Often you will see fish holding just beneath the surface tipping just their heads up to sip in the duns. A sure sign that fish are feeding on the surface is when you see the white of the inside of their mouths, and bubbles on the surface.
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