NymphChocolate Foam Back
The Chocolate Foam Back is a simple and effective nymph pattern that uses foam for buoyancy and visibility. The chocolate brown coloration with foam back creates a realistic profile of various aquatic insects. The pattern features a segmented body created with wire ribbing and a prominent foam back that provides both flotation and a realistic silhouette. This pattern is particularly effective as a searching nymph in a variety of water conditions.
Year-round
Beginner
Trout
Nov 2025
Overview
The Chocolate Foam Back is a versatile nymph pattern that can be tied in various sizes to match different insects. The foam back provides both buoyancy and a realistic segmented appearance. The copper wire ribbing adds durability and segmentation while also providing a subtle flash. The pattern sinks slowly due to the foam back, making it ideal for fishing in the film or just below the surface. Can be tied in different colors to match various aquatic insects.
Materials
Hook: Tiemco TMC 2488 - Size 20
Hook (Alternate): Daiichi 1130 - Size 20
Thread: Semperfli Classic Waxed Thread - Brown, 8/0
Rib: UTC Ultra Wire - Copper, Small
Back: Wapsi Razor Fly Foam - White
Dubbing: Wapsi SLF Kaufmann Dubbing - Brown Stone
Behavior & Presentation
Natural Behavior: Heavy-bodied stonefly nymphs cling to substrate using powerful claws, occasionally releasing their grip and tumbling downstream before reattaching. Pre-emergence movements and bottom disturbances increase their availability, making them priority targets for substantial nutrition.
Where Trout Eat It: Fish hold in mid-water columns near structure in pocket water and runs where drifting nymphs concentrate at moderate depths.
How to Fish It: Dead drift through feeding lanes using the foam back to suspend the fly in the water column naturally.
Best Water: Target pocket water, runs, and riffle edges in freestone streams where current delivers consistent nymph drift to holding fish.
Strike Type: Watch for indicator dips, subtle line tightening, or hesitations signaling fish intercepting the drifting nymph.
Fishing Strategy
Rigging Suggestions: Works well as part of a two-fly nymph rig, either as a dropper or lead fly.
Seasonal Timing: Peak activity during moderate temperatures, typically mid-morning through afternoon during optimal conditions.
Pro Tips: Adjust presentation depth and speed based on fish activity level and current conditions for best results.
Entomology
Stonefly nymphs cling to substrate in fast water using powerful tarsal claws, occasionally releasing their grip and tumbling downstream before reattaching. Their heavy-bodied drift provides substantial nutrition, making them priority targets during periods when bottom disturbances or pre-emergence movements increase availability in feeding lanes.
- Order
- Plecoptera
- Common Name
- Stonefly
- Organism Type
- insect
- Life Stage
- nymph