Thread: Isonychia Nymph
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Old 12-21-2009, 05:06 PM
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Hugh Hartsell Hugh Hartsell is offline
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Join Date: Jan 2006
Location: Morristown Tn.
Posts: 394
Default Isonychia Nymph tying instructions

There are several ways that you can tie the Iso and they will all work to some extent. The method that is shown by Grannyknot is the way that I tied the fly for a number of years. If you will notice in the picture that he has linked, it looks more like a Stonefly Nymph than an Iso. The reason is probably that there are a few different strains of the fly. The first ones that I used to see were on a Springcreek and they were the Bicolor strain and they are about the same color as the fly that he has pictured. I thought they were Stoneflies for years. The strain that you will find in the Park are a darker colored strain and just a little smaller. I went through several different patterns through the years and I finally settled on this one that you see on my website. It is a little harder to tie , but it is very effective.

Isonychia Nymph materials:
Hook: Mustad 96706 3x long #14- 16
Uni Thread: 8/0 Black
Tail: 3 barbs of black Ostrich herl
Ribbing: 6x tippet
Vertical Rib-Butt end of peacock herl or dental floss
Abdomen and thorax: Light wrapping of black superfine dubbing
Abdomen Gills: One strand of black ostrich herl
Wingcase: slip of black section of turkey tail feather or crow feather
Legs: Black rooster feather with the tip v- notched tied in behind hookeye

Tying instructions:
Place 96706 hook in the vice and wrap 15 wraps of .015 wire
Wind on 8/0 black thread and wind down to the hook bend
Tie in 3 short tips from black ostrich herls. Trim as needed
Next, tie in 6x tippet, follow with butt end of a strand of peacock herl
Now dub the full body with black superfine dubbing. Bring thread back
to the hookbend and tie in 1 strand of black ostrich herl
Wind ostrich herl up to the thorax section and tie off
Trim the top and bottom of the ostrich herl and this will leave gills on the sides
Bring peacock herl forward and tie in at the beginning of the thorax section
pick up the tippet material and wind forward making a segmented body look
Tie in at the thorax and then tie in the black turkey slip
Now take the v-notched rooster feather and place across the top of the hookeye and tie in, angling the legs slightly downward
Finally, bring the wingcase and peacock herl forward and tie off behind the hookeye, making sure that the peacock herl is aligned all the way up the center of the fly.

It is a little complicated at first, but it will reward your efforts. As I mentioned, this particular pattern is designed almost exclusivly for the Park and you may want to have both patterns on hand, depending on which stream that you are fishing. Good luck with your flies.
Hugh Hartsell---East Tenn.
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