Michigan Flies

Hatches / mayfly

Trico

A

Tricorythodes spp.

Also called Tricorythodes, White-Winged Black, Trike.

The tiny morning mayfly of late July through October, fished from 6 to 10 am when the spinner clouds drop onto flat water and pods of trout sip steadily. Duns hatch late evening or very early morning; the mid-morning spinner fall (roughly 9-11 am, keyed to warming air) is the event, and it runs daily for weeks on the Au Sable, Upper Manistee, Boardman and Pigeon, and on the Muskegon between the dam and Henning Park. Fish a #22-24 Trico spinner on 6X-7X, or a double-spinner pattern as the Muskegon guides do, with a long drag-free drift. September Tricos on the South Branch Au Sable are a reliable close to the season.

#20–26morningdunspinnerblack body with white wing (male spinner)pale olive body with white wing (female)pale gray to olive dun

nmacelko2 · CC0 · iNaturalist · Bethlehem, PA · 2022

Timing by region

  1. Southeast Lower Peninsula
    1. J
    2. F
    3. M
    4. A
    5. M
    6. J
    7. J
    8. A
    9. S
    10. O
    11. N
    12. D
    Window
    Jul 6 – Oct 6
    Peak
    —
  2. Southwest Lower Peninsula
    1. J
    2. F
    3. M
    4. A
    5. M
    6. J
    7. J
    8. A
    9. S
    10. O
    11. N
    12. D
    Window
    Jul 10 – Oct 10
    Peak
    —
  3. Northeast Lower Peninsula
    1. J
    2. F
    3. M
    4. A
    5. M
    6. J
    7. J
    8. A
    9. S
    10. O
    11. N
    12. D
    Window
    Jul 20 – Oct 20
    Peak
    —
  4. Northwest Lower Peninsula
    1. J
    2. F
    3. M
    4. A
    5. M
    6. J
    7. J
    8. A
    9. S
    10. O
    11. N
    12. D
    Window
    Jul 20 – Oct 20
    Peak
    —
  5. Upper Peninsula
    1. J
    2. F
    3. M
    4. A
    5. M
    6. J
    7. J
    8. A
    9. S
    10. O
    11. N
    12. D
    Window
    Aug 10 – Nov 10
    Peak
    —

Flies that match

Trico Spinner (reference photo)Reference photo
Trico Spinner
A
Dry fly#20–26Black body, clear wings (female)Olive body (dun)Double spinner

The morning spinner fall, 6 to 10 am, from July 20 to mid October on the Au Sable, Boardman and Pere Marquette (August 3 onward in the U.P.). Supinski's Muskegon chart says fish #24 double spinner patterns, since fish gorge on clumps. Requires 6X to 7X and a downstream drift over flat water.

Dry fly

Reserve · $3.00