Riverstone Olive Mayfly Dun

by @dekasso

Gold Ribbed Olive Dun · Dry fly

Olive and gold drifting over clear stones

A size 16 olive mayfly dun with a gold-ribbed floss body and split tail, tied for trout during olive hatches.

An olive mayfly dun hovers over a clear, stony streambed with its split tail and grey wing swept back. The smooth olive floss body carries a bright gold tinsel rib, finished with a fuzzy grey thorax.

Pattern
Gold Ribbed Olive Dun
Imitates
Olive mayfly hatches, typically overcast afternoons in spring and autumn
Hook
size 16
Tippet
5Xrule of three
  • Olive floss body, gold tinsel rib
  • Split Microfibbet tail for balance
  • Grey dun hackle-fibre wing
  • Fuzzy grey rabbit thorax
  • Size 16 dry-fly hook

On the water

A dry fly riding the surface of a trout river

Olive floss wraps the body in a smooth, even sheen, banded by a thin gold rib. Long pale tails fan out behind. Up front, a grey wing leans back over a scruffy thorax, the colour of wet river rock.

Fish it in clear riffles and glides when small olives come off on grey afternoons. Cast upstream and let it drift dead, with no drag, over the seams between the stones.

Split tail first. A small ball of thread under the tail fibres spreads them into a wide V, and that keeps the fly sitting level on the water.

A coiled leader, tippet spools and an open fly box on slate

Rigging

Tippet
5Xhook size divided by three
Leader
Nine feet, tapered — longer and finer in flat water
  • Rig on 5X or 6X tippet so the fly drifts without drag.
  • A light floatant on the wing and thorax keeps it riding high.
  • Dead drift only; mend early to keep the tail from swinging.

Where and when

Hatch
Olive mayfly hatches, typically overcast afternoons in spring and autumn
Target
Trout
Water type
Clear riffles, glides and slow runs over stones
Also fishes
Slow pools and spring creeks during light olive hatches, and smooth tailouts in the evening when trout sip quietly.

Make it yourself

Intermediate6 materials · 10 steps

Pattern
Gold Ribbed Olive Dun
Style
Dry fly
Hook
Dry-fly hooksize 16
Thread
Grey 8/0
Fly-tying materials laid out on a dark bench

Materials in the order they go on the hook

  1. TailLight dun Microfibbets
  2. RibFine gold tinsel
  3. BodyOlive floss
  4. WingGrey dun hackle fibres
  5. ThoraxGrey rabbit dubbing
  6. HeadGrey 8/0 thread

Details

Imitates
Mayfly dun
Colors
Olive, Gold, Grey, Pale dun
A fly-tying vise holding a bare hook on a wooden bench

How to tie it

The steps, from first wrap to whip finish (10)
  1. Mount the hook in the vise and start the grey thread behind the eye, running it back to the bend.
  2. Build a tiny ball of thread at the bend to act as a splitter.
  3. Tie in two or three Microfibbets on each side of the ball so they flare into a V, about one shank length long.
  4. Tie in the fine gold tinsel at the bend, leaving the tag ready for ribbing.
  5. Tie in the olive floss and wrap a smooth, slightly tapered body over the rear two thirds of the shank.
  6. Spiral the gold tinsel forward in five or six evenly spaced turns and tie it off.
  7. Tie in a bunch of grey dun hackle fibres on top, sloping back over the body, about one shank length long.
  8. Dub a loose, shaggy thorax of grey rabbit around the base of the wing.
  9. Pick out a few dubbing fibres to suggest legs.
  10. Build a small, neat thread head and whip finish.
Proportions (4)
  • Tail: about one hook shank length, split into a wide V.
  • Body: rear two thirds of the shank, tapering slightly toward the thorax.
  • Wing: roughly one shank length, sloping back at about 45 degrees.
  • Thorax: front third of the shank, a little fuller than the body.
Tips (3)
  • Wrap floss flat and untwisted for a glassy, even finish.
  • Keep rib turns evenly spaced so the gold bands read clearly.
  • Use sparse dubbing on the thorax; a few picked-out fibres float better than a dense ball.
Common mistakes (4)
  • Tail fibres bunching together: build the thread ball first and tie fibres on its sides.
  • Lumpy body: lay a smooth thread underbody before wrapping the floss.
  • Wing too bulky: use a modest bunch of hackle fibres so the fly lands softly.
  • Crowded eye: leave room behind the eye before adding the thorax.
A dozen-fly materials kit laid out on slate with its recipe card.
The kit

Every kit size

Materials only

Size 16 · Materials only · 12 flies

$43.10

$3.59 a fly

Includes Dry-fly hook · and 8 more

Every item in this kit · 9 items

Hooks & beads

  • Dry-fly hook$6.501 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$2.951 spool
  • Fine gold tinsel$3.251 spool

Materials

  • Light dun Microfibbets$3.501 pack
  • Other material: Olive floss$4.501 pack · From the recipe row "Body"
  • Grey dun hackle fibres$11.951 saddle pack
  • Grey rabbit dubbing$4.501 dispenser

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · Materials only · 48 flies

$69.83

$1.45 a fly

Bought separately $73.50 · you save $3.67

Includes Dry-fly hook · and 8 more

Every item in this kit · 9 items

Hooks & beads

  • Dry-fly hook$132 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$5.902 spools
  • Fine gold tinsel$3.251 spool

Materials

  • Light dun Microfibbets$3.501 pack
  • Other material: Olive floss$92 packs · From the recipe row "Body"
  • Grey dun hackle fibres$23.902 saddle packs
  • Grey rabbit dubbing$92 dispensers

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · Materials only · 144 flies

$168.17

$1.17 a fly

Bought separately $191.10 · you save $22.93

Includes Dry-fly hook · and 8 more

Every item in this kit · 9 items

Hooks & beads

  • Dry-fly hook$351 × 100 + 2 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$17.706 spools
  • Fine gold tinsel$9.753 spools

Materials

  • Light dun Microfibbets$10.503 packs
  • Other material: Olive floss$22.505 packs · From the recipe row "Body"
  • Grey dun hackle fibres$71.706 saddle packs
  • Grey rabbit dubbing$184 dispensers

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

With vise & tools

Size 16 · With vise & tools · 12 flies

$193.10

$16.09 a fly

Includes Dry-fly hook · and 17 more

Every item in this kit · 18 items

Hooks & beads

  • Dry-fly hook$6.501 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$2.951 spool
  • Fine gold tinsel$3.251 spool

Materials

  • Light dun Microfibbets$3.501 pack
  • Other material: Olive floss$4.501 pack · From the recipe row "Body"
  • Grey dun hackle fibres$11.951 saddle pack
  • Grey rabbit dubbing$4.501 dispenser

Finishing

  • Head cement$5.951 bottle

Tools

  • Rotary pedestal vise$791
  • Ceramic bobbin$141
  • Fine-point scissors$161
  • Whip finisher$91
  • Hackle pliers$71
  • Bodkin$51
  • Bobbin threader$41
  • Dubbing wax$41
  • Canvas tool roll$121

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · With vise & tools · 48 flies

$212.33

$4.42 a fly

Bought separately $223.50 · you save $11.17

Includes Dry-fly hook · and 17 more

Every item in this kit · 18 items

Hooks & beads

  • Dry-fly hook$132 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$5.902 spools
  • Fine gold tinsel$3.251 spool

Materials

  • Light dun Microfibbets$3.501 pack
  • Other material: Olive floss$92 packs · From the recipe row "Body"
  • Grey dun hackle fibres$23.902 saddle packs
  • Grey rabbit dubbing$92 dispensers

Finishing

  • Head cement$5.951 bottle

Tools

  • Rotary pedestal vise$791
  • Ceramic bobbin$141
  • Fine-point scissors$161
  • Whip finisher$91
  • Hackle pliers$71
  • Bodkin$51
  • Bobbin threader$41
  • Dubbing wax$41
  • Canvas tool roll$121

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · With vise & tools · 144 flies

$300.17

$2.08 a fly

Bought separately $341.10 · you save $40.93

Includes Dry-fly hook · and 17 more

Every item in this kit · 18 items

Hooks & beads

  • Dry-fly hook$351 × 100 + 2 × 25 · size 16

Thread & wire

  • Grey 8/0 thread$17.706 spools
  • Fine gold tinsel$9.753 spools

Materials

  • Light dun Microfibbets$10.503 packs
  • Other material: Olive floss$22.505 packs · From the recipe row "Body"
  • Grey dun hackle fibres$71.706 saddle packs
  • Grey rabbit dubbing$184 dispensers

Finishing

  • Head cement$5.951 bottle

Tools

  • Rotary pedestal vise$791
  • Ceramic bobbin$141
  • Fine-point scissors$161
  • Whip finisher$91
  • Hackle pliers$71
  • Bodkin$51
  • Bobbin threader$41
  • Dubbing wax$41
  • Canvas tool roll$121

Guide

  • Printed recipe and tying stepsIncluded1

The creator

An illustrated portrait for Dekasso (an illustration, not a photograph)

Dekasso

@dekasso

Wherever the truck rolls to a stop.

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