Spring Olive Mayfly Dry Fly

by @troutslayerunicorn

Blue Wing Olive · Dry fly

A blue sail lifting off olive water

A size 16 olive mayfly dry fly with a black-ribbed body and blue dun wing, for trout rising to small olive duns.

An olive mayfly dry fly sits in the vise above a clear, stony river, its fan wing raised high. The olive body carries crisp black thread ribs, a blue dun wing and long grey microfibbet tails.

Pattern
Blue Wing Olive
Imitates
Baetis mayfly hatch
When
typically spring and autumn afternoons, often heaviest on grey, drizzly days
Hook
size 16
Tippet
5Xrule of three
  • Size 16 dry fly hook
  • Black thread rib segments the olive body
  • Blue dun wing rides tall and visible
  • Split grey microfibbet tails

On the water

A dry fly riding the surface of a trout river

Olive body, banded in neat black stripes. A tall fan of blue dun fibers stands over the thorax, and fine grey tails reach far past the bend. Behind it, a shallow river runs green and brown over stones.

Fish it on the soft seams below riffles and along slow glides when small olives start drifting. Cast a few feet above the rise, mend once, and let it ride drag-free. No twitches, just a clean float.

Black thread rib is the detail to get right. Keep the turns evenly spaced and snug so each olive segment reads clearly, the way a real mayfly abdomen does 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 9 to 12 ft leader tapered to 5X or 6X tippet.
  • Dress the wing and tails lightly with floatant; keep the body clean.
  • Aim for a dead drift; a reach cast helps on smooth, slow currents.

Where and when

Hatch
Baetis mayfly hatchtypically spring and autumn afternoons, often heaviest on grey, drizzly days
Target
Trout
Water type
Riffle tails, slow glides and flats on freestone rivers and spring creeks
Also fishes
Also fishes calm stillwater edges during olive hatches and slow tailouts on overcast evenings.

Make it yourself

Intermediate5 materials · 10 steps

Pattern
Blue Wing Olive
Style
Dry fly
Hook
Dry fly hooksize 16
Thread
Olive 8/0
Fly-tying materials laid out on a dark bench

Materials in the order they go on the hook

  1. TailGrey microfibbets
  2. RibBlack 8/0 thread
  3. BodyOlive dubbing
  4. WingBlue dun hackle fibers
  5. ThoraxOlive dubbing

Details

Imitates
Blue-winged olive mayfly dun
Colors
Olive, Black, Blue dun, Silver grey
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 and start the olive thread behind the eye, laying a thin base back to the bend.
  2. Tie in two or three grey microfibbets on each side of the bend, splayed apart.
  3. Tie in the black thread rib at the bend and leave it hanging.
  4. Dub a slim, tapered olive body over the rear two-thirds of the shank.
  5. Wrap the black rib forward in five or six even, open turns and tie it off.
  6. Even the tips of a clump of blue dun hackle fibers and tie them in at the two-thirds point, tips forward.
  7. Lift the wing upright and build a small thread dam in front to hold it there.
  8. Spread the wing fibers into a gentle fan with your thumbnail.
  9. Dub a slightly fuller olive thorax around the wing base and up to the eye.
  10. Form a small, neat head and whip finish.
Proportions (4)
  • Tails: about one and a half times the hook shank length, split wide.
  • Wing: roughly one shank length tall, standing straight up.
  • Body: rear two-thirds of the shank, thin and tapered.
  • Thorax: front third, a touch thicker than the body.
Tips (3)
  • Use very little dubbing for the body; a thin taper floats better and shows the ribs.
  • Measure the wing against the shank before tying it in so every fly matches.
  • A tiny ball of dubbing at the bend helps keep the tails split.
Common mistakes (3)
  • Wing leaning back: build a firm thread dam in front before dubbing the thorax.
  • Uneven rib spacing: count the turns and keep the gaps the same width.
  • Crowded eye: stop the thorax short to leave room for the head and whip finish.
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

$38.60

$3.22 a fly

Includes Dry fly hook · and 7 more

Every item in this kit · 8 items

Hooks & beads

  • Dry fly hook$6.501 × 25 · size 16

Thread & wire

  • Olive 8/0 thread$2.951 spool
  • Black 8/0 thread$3.251 spool

Materials

  • Grey microfibbets$3.501 pack
  • Olive dubbing$4.501 dispenser
  • Blue dun hackle fibers$11.951 saddle pack

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · Materials only · 48 flies

$62.75

$1.31 a fly

Bought separately $66.05 · you save $3.30

Includes Dry fly hook · and 7 more

Every item in this kit · 8 items

Hooks & beads

  • Dry fly hook$132 × 25 · size 16

Thread & wire

  • Olive 8/0 thread$2.951 spool
  • Black 8/0 thread$3.251 spool

Materials

  • Grey microfibbets$3.501 pack
  • Olive dubbing$13.503 dispensers
  • Blue dun hackle fibers$23.902 saddle packs

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

Size 16 · Materials only · 144 flies

$156.42

$1.09 a fly

Bought separately $177.75 · you save $21.33

Includes Dry fly hook · and 7 more

Every item in this kit · 8 items

Hooks & beads

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

Thread & wire

  • Olive 8/0 thread$8.853 spools
  • Black 8/0 thread$9.753 spools

Materials

  • Grey microfibbets$10.503 packs
  • Olive dubbing$368 dispensers
  • Blue dun hackle fibers$71.706 saddle packs

Finishing

  • Head cement$5.951 bottle

Guide

  • Printed recipe and tying stepsIncluded1

With vise & tools

Size 16 · With vise & tools · 12 flies

$188.60

$15.72 a fly

Includes Dry fly hook · and 16 more

Every item in this kit · 17 items

Hooks & beads

  • Dry fly hook$6.501 × 25 · size 16

Thread & wire

  • Olive 8/0 thread$2.951 spool
  • Black 8/0 thread$3.251 spool

Materials

  • Grey microfibbets$3.501 pack
  • Olive dubbing$4.501 dispenser
  • Blue dun hackle fibers$11.951 saddle pack

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

$205.25

$4.28 a fly

Bought separately $216.05 · you save $10.80

Includes Dry fly hook · and 16 more

Every item in this kit · 17 items

Hooks & beads

  • Dry fly hook$132 × 25 · size 16

Thread & wire

  • Olive 8/0 thread$2.951 spool
  • Black 8/0 thread$3.251 spool

Materials

  • Grey microfibbets$3.501 pack
  • Olive dubbing$13.503 dispensers
  • Blue dun hackle fibers$23.902 saddle packs

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

$288.42

$2 a fly

Bought separately $327.75 · you save $39.33

Includes Dry fly hook · and 16 more

Every item in this kit · 17 items

Hooks & beads

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

Thread & wire

  • Olive 8/0 thread$8.853 spools
  • Black 8/0 thread$9.753 spools

Materials

  • Grey microfibbets$10.503 packs
  • Olive dubbing$368 dispensers
  • Blue dun hackle fibers$71.706 saddle packs

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 Hit the Hatch (an illustration, not a photograph)

Hit the Hatch

@troutslayerunicorn

I am Hit the Hatch!

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