When to use it
- When a report says mayfly without a verified species or stage.
- When rise form and water position narrow the stage.
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Reviewed representative comparison← Fly Box
Pattern family · guide 41
Mayfly Patterns by Stage
A stage-first guide for reports that name a mayfly but do not identify a species or exact fly.
- Size range
- Match the local insect; the family label gives no exact size
- Colors reviewed
- olive, tan, brown, cream, gray
- Imitates
- mayfly nymph, mayfly emerger, dun or cripple, spent spinner
Mayfly nymphs, emergers, upright-wing duns, cripples, soft hackles, and flat-wing spinners occupy different depths and require different profiles.
Technical illustration
Representative forms
Mayfly Patterns by Stage stage map
A family-level comparison of Nymph / subsurface, Emerger / film, Dun or spinner / surface; no single drawing represents the whole family.
- View
- stage comparison map
- Color shown
- natural olive, tan, gray, and rust
- Look for
- nymph below; emerger in the film; upright dun; flat spinner
On the water
Narrow the family.
The river, depth, insects, and fish behavior still decide the final presentation. These are reviewed starting points—not a claim about what is happening today.
How to fish it
- Nymphs below, emergers in the film, duns on top, spinners flat in the film.
Mistakes to avoid
- Using one dry as the picture for all mayflies.
- Calling seasonal wording a live hatch observation.
Variant control
Small changes matter.
This stage comparison keeps materially different forms labeled. It is a family guide, not a claim that one fly represents every stage or local species.
Representative stage forms
Mayfly nymphs, emergers, upright-wing duns, cripples, soft hackles, and flat-wing spinners occupy different depths and require different profiles.- Colors shown
- olive, tan, brown, cream, gray
- Weighting
- Weight and buoyancy depend on the life stage and exact named pattern.
Review trail
Sources, rights, and limits.
Pattern facts were reviewed on 2026-07-12. Every image has its own rights record; photographed hand-tied flies may still vary slightly in proportion.