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Dry FliesHatching Olive Variant

The Hatching Olive Variant is a dry fly pattern designed by Mary Dette. This effective pattern combines traditional materials with proven techniques for consistent results in a variety of water conditions.

Season
Spring, Summer, Fall
Difficulty
Intermediate
Target Species
Trout
Updated
Feb 2026
Hatching Olive Variant fly pattern - imitates Ants tied for Trout

Overview

Mary Dette's design comes from the legendary Dette family of Catskills tyers, featuring the delicate proportions and quality materials characteristic of their work. The olive coloration and sparse hackle suggest emerging mayflies struggling in the surface film. The pattern's traditional Catskills construction emphasizes proper balance and floatation, making it effective on the technical tailwaters where the style originated.

Materials

Hook: 16
Thread: Grey
Tail: Brown hackle fibers
Ribbing: Light olive silk
Body: Green silk
Wing: Grey mallard quill slips
Hackle: Brown cock

Behavior & Presentation

Natural Behavior: Ants march in organized columns near water's edge, occasionally tumbling into the current where they struggle helplessly while trapped by surface tension, their legs creating tiny disturbances. Fish target these terrestrial insects during warm-weather falloffs because ants provide concentrated protein sources that float motionless for extended periods, making them easy pickings for selective feeders.

Where Trout Eat It: Trout selectively sip small dark mayflies in Catskills tailwater eddies during cold-weather hatches when duns float extended distances.

How to Fish It: Extended drag-free drifts using Catskills technique with fine 5X tippet, allowing sparse olive pattern to float naturally.

Best Water: Target back eddies with circular drift patterns, slack water below undercuts, and foam lines near weed bed margins.

Strike Type: During extended Catskills-style drag-free drifts with fine 5X tippet, fish take with quiet sipping rises. Expect subtle surface dimples in back eddies and slack water below undercuts, rather than confident splashy takes.

Fishing Strategy

Rigging Suggestions: Use a 9-12 foot leader tapering to 5X tippet for delicate presentations. Apply floatant to the body and hackle.

Seasonal Timing: Most effective during peak feeding periods at dawn and dusk. Water temperatures between 45-65°F typically produce best results.

Pro Tips: The olive coloration matches Baetis species across different regions, making this a go-to pattern for technical spring and fall fishing. Fish it in tandem with a Baetis nymph as a dropper for covering multiple feeding zones simultaneously.

Entomology

Ants march in organized columns near water's edge, occasionally tumbling into the current where they struggle helplessly while trapped by surface tension, their legs creating tiny disturbances. Fish target these terrestrial insects during warm-weather falloffs because ants provide concentrated protein sources that float motionless for extended periods, making them easy pickings for selective feeders.

Order
Hymenoptera
Family
Formicidae
Common Name
Ant
Organism Type
terrestrial
Life Stage
adult

Pattern Characteristics

Intermediate Difficulty
Trout
Moving Water
Stillwater
Spring
Summer
Fall
Imitates: Ants
Northeast
dead-drift
classic