OSA Nymph - A generic nymph that can do equally well as a stonefly or mayfly nymph as it can a waterboatman or backswimmer - Global FlyFisher

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OSA Nymph


Published Jul 8th 2014

A generic nymph that can do equally well as a stonefly or mayfly nymph as it can a waterboatman or backswimmer

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OSA nymphs

This fly have caught many trout and yellowfish for me, over the last couple of years.
It is one of my 4 or 5 top goto flies, and when I start fishing I often tie on an OSA Nymph.
It is a general mayfly to stonefly nymph profile. The black bead and abdomen, gives a very good profile against any background and in any light conditions, with the UV dubbing add a different depth, dimension in the light and in the light spectrum.

I paged thru some old magazines, the other day, and saw the TVN nymph, and thought there is something similar to the profile and color of the TVN nymph, what could be another reason for doing so well with the yellows.

Corixa

It has also produced a good number of fish on still waters. When I was looking at the water boatmen, backswimmers and corixia images on the net the other day, I realised why. The basic profile is very close to the water boatmen, backswimmers and corixia. But the UV thorax, makes a very good air bubble impersonation.

Perhaps, for most fish, it looks, just too much like food, to not taste it.


What's OSA for a name anyway?
OSA is a fly named after the Old South Africa (apartheid, definite segregation etc). The fly being distinctly black and white mixed with brownish colors it's a reflection of SA as it was. We had black people, white people, the copper wire was for the Indian/curry and the pheasant tail was the colored or brown people (people with mixed parents, black and white) and the tungsten bead is all the hard headed people in South Africa.
All of this might not make sense if you don't know too much about SA, apartheid etc.


OSA Nymph
TypeNymph
Originator
Korrie Broos
Difficulty
Easy

Materials
Hook#8 to 18
BeadBlack or gun metal black
WeightLead or tungsted wire
ThreadBlack
Tail6 to 10 Pheasant tail barbs, depending on the size of the fly
RibCopper wire
BodyBlack possum or squirrel dubbing
ThoraxWhite UV Dubbing

Tying instructions
  1. Place bead behind hook eye, and wrap the optional lead wire behind bead.
  2. Tie in Pheasant tail in as tail and leave the long butt section, as this will become the legs.
  3. Tie in the copper wire.
  4. Apply dubbing and wrap over the pheasant tail fibres, to about two-thirds up the hook shank.
  5. Rib with copper wire and tie off copper wire.
  6. Lift pheasant tail fibres up and dub thread and under the pheasant tail fibres to bead.
  7. Backward and forward wrapping of the UV dubbing can be done, to attain the right density, covering shape of thorax.
  8. Take pheasant tail barbs over UV dubbed thorax and tie in with 2 or 3 wraps behind the bead.
  9. Split barbs in equal numbers and fold to either side of bead/body.
  10. Tie the barbs in at about 45 degrees to body and whip finish.
  11. Trim the barbs about two-thirds of the overall length of fly.




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