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Dry FliesChubby Chernobyl

The Chubby Chernobyl is a large, high-floating dry fly that is easy to see and is capable of holding up even the heaviest of droppers. It's a versatile attractor pattern and has a foam body which makes it nearly unsinkable.

Season
Summer
Difficulty
Intermediate
Target Species
Trout
Updated
Apr 2025
Chubby Chernobyl fly pattern - imitates Grasshoppers tied for Trout

Overview

A buoyant, high-floating terrestrial dry fly, the Chubby Chernobyl features a foam body, rubber legs, and a flashy wing made of synthetic fibers like Widow's Web or McFlylon. It's easy to see, floats all day, and works great as a hopper or stonefly imitation—often used as the lead fly in a dry-dropper setup.

Materials

Hook: #06-14 Tiemco 5262
Thread: Cream UTC 70 or 140
Tail: Pearl Krystal Flash
Body: UV Tan Ice Dubbing
Body2: Tan 2MM Foam
Wing: White McFlyfoam
Legs: Ginger Lifeflex or Spanflex

Behavior & Presentation

Natural Behavior: Large terrestrial insects struggle violently when water-bound, generating concentric rings and surface disturbance that telegraph distress signals across pools. Foam-lined banks and undercuts become collection zones where struggling hoppers and beetles accumulate after wind events.

Where Trout Eat It: Fish focus on surface lanes in tail-outs, seams, and slicks where insects concentrate. Trout rise in upper water column, often establishing predictable feeding stations.

How to Fish It: Dead-drift in feeding lanes with drag-free presentation, mending to extend float. Focus on slicks and tail-outs where surface currents concentrate insects.

Best Water: Tail-outs, slicks, seams, and flats where surface currents create predictable drift lanes. Foam lines and current breaks that concentrate insects.

Strike Type: Confident surface rise, ranging from subtle sip to aggressive splash depending on insect size.

Fishing Strategy

Rigging Suggestions: This fly is often used as an indicator fly in a hopper-dropper rig due to its high visibility and buoyancy.

Seasonal Timing: Use this fly in the months, when grasshoppers are prevalent. This fly is best used during hopper season, but can be effective any time large terrestrial insects are present.

Pro Tips: The Chubby Chernobyl is highly visible due to its large size and foam body, it floats high and is nearly unsinkable due to its foam body.

Entomology

During peak terrestrial season, grasshoppers land clumsily on the water surface when attempting to jump across streams or falling from overhanging vegetation during strong afternoon winds. Their heavy bodies create a pronounced splat and they thrash helplessly while trapped in the surface film, generating vibrations that trigger aggressive strikes from opportunistic feeders. Trout station themselves near grassy banks and undercut edges specifically to intercept these substantial terrestrial meals during late-summer feeding frenzies.

Order
Orthoptera
Family
Acrididae
Common Name
Grasshopper
Organism Type
terrestrial
Life Stage
adult

Pattern Characteristics

Intermediate Difficulty
Trout
Stillwater
Moving Water
Summer
Imitates: Grasshoppers
Rocky Mountain
Green River (UT)
South Platte River
Colorado River
Madison River
dead-drift
stonefly-hatch
hopper-season
attractor
searching-pattern

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