A nymph, tied #14–18, carried year round.
It is tied against 2 named insects in this
book — all year.
#14–18Hook size
nymphType
AllSeason
2Hatches matched
What it looks like
A drawing, not a photograph, and not traced from one. Its proportions were read off
5 independent reference photographs of the pattern and written down as
5 measured characteristics — wing angle, tail length against the shank,
how far a hackle fibre reaches — every one of which had to hold across more than one of them
before it could be drawn. What survives across many photographs of a fly is the fly.
A sowbug pattern from the Bighorn, named because a blind man could catch fish on it. Ostrich herl under a pearl shellback, and nothing else.
Drawn at #16 — 7.0 mm of shank and
3.5 mm of gape on a Tiemco 100.
The bare hook at every size this pattern is tied in, all to the same scale. There is no
industry standard behind a hook number, so these are Tiemco 100
measurements and another maker's 14 will differ a little.
What it imitates
Each of these is the same hatch record the app's own panel reads, so a pattern
recommended on a river card in the app is recommended for one of the insects below.
In tying order. This dressing is the standard one — these patterns have been in the publicrecord for decades — and materials
substitute freely: the proportions and the silhouette are the pattern, not the brand of
dubbing.
Hook
Curved scud hook, sizes 14–18
Thread
Grey 8/0
Body
Grey or tan ostrich herl or dubbing
Shellback
Pearl or grey scud back
Bead
Small tungsten or brass
When to fish it
Spring creeks and limestone water, dead-drift and deep. It has no legs, no tail and no hackle, and it beats sowbugs with all three.
Carried all year. The insects it matches are active all year, in water from
33°F to
70°F.
Target species
Trout
Rivers it fishes well
Rivers with a page here that sit in the regions where the insects this pattern imitates are
recorded. It is a claim about coverage, not a report of a fish caught.