September 14, 2016
September 14, 2016
After this morning’s rain subsided several mayflies hatched on the field water of the Double R Ranch and the fish were actively pursuing them under snotty weather conditions. The bugs included Tiny Blue Winged Olives (#20-22), small Callibaetis (#18) and some Pale Morning Duns (#18). But, to me the most interesting sighting was the first appearance of the season of. . . .
THE PISTACHIO DUN . . . .
When the weather cools down seriously in September there is an isolated hatch of a species in the Baetis family which either Bob Turzian or I named the “Pistachio Dun.” I’m not sure that the Pistachio Dun is really a separate species or whether there is something about the Double R Ranch retch of Silver Creek which produces such an unusual coloration in our Baetis. I’m inclined to believe that it is its own species. I’ve been told that the Pistachio Dun can also be encountered on parts of the Wood River. I’ve seen this rather striking mayfly on the Double R and also a couple of hundred yards above the Picabo Bridge, so you could encounter it anywhere on Silver Creek.
The Pistachio Dun looks like the usual Baetis mayfly except that the body color is a bright pistachio color and in my experience it is a rather large BWO. I usually tie up a size 18 fly but a trusted angling companion just told me that he ran into some size 24 specimens today. My sense is that just about any dry BWO pattern will work during this hatch as long as its coloration matches the natural, whether you call it pistachio, lime green or chartreuse. When I tie my imitation in a size 18 I use the “Caddis Green” Professional Dubbing put out by Trout Hunter/Rene Harrop. If I were to tie up a size 20 or 22 Pistachio Dun Hatch Matcher I would use chartreuse tying thread for the body. I tie my Pistachio Dun with a light colored wing so that I can easily see the fly. My favorite design involves wings fashioned from pulled down white CDC. Here is my recipe for the Pistachio Dun CDC Winged Parachute:
Hook: Daiichi 1110 (“Big Eye”) or standard dry fly hook.
Tail: Light or medium dun Microfibbets (or similar tailing material)
Wings: Pulled down (reversed tied) CDC, white or light dun.
Hackle: Grizzly or medium dun Whiting 100 saddle hackle (or similar)
Tip: After fly is completed, apply head cement to wings for durability.
Doug Andres, Stream Keeper, Double R Ranch