Dry FliesAlly Finn
Hans Weilenmann ties the Ally Finn on a Tiemco 777SP with a peach Crystal Meth braid body and a looped Wapsi Crawdub softshell yolk sac, then sets sparse grey Llama Mix and bronze mallard barbs as an understated wing pair. The pale, translucent body and sparse dressing suggest a newly emerged caddis adult sitting low against the surface.
Spring, Summer, Fall
Intermediate
Trout
Feb 2026
Overview
White Gudebrod working thread carries the peach braid body and looped softshell yolk sac before a black Sparton thread head finishes the fly, giving it a slim, translucent profile. Sparse grey Llama Mix underwing and bronze mallard barbs sit flat rather than upright, keeping the silhouette low and understated rather than bulky. That build matches adult caddis just after they break from the pupal shuck and are still righting themselves on the surface. It fits caddis activity across moving water and stillwater from spring through fall, best fished during the scramble right after naturals emerge.
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Materials
- Hook:
- Tiemco 777SP #10
- Working thread:
- Gudebrod 8/0, white
- Head:
- Sparton 6/0, black
- Yolk sac:
- Wapsi Crawdub, softshell - fibers aligned and tied in as a loop
- Body:
- Oil Creek Outfitters Crystal Meth braid, peach
- Underwing:
- Llama Mix, grey - very sparse
- Wing:
- Bronze mallard barbs - very sparse
Behavior & Presentation
Natural Behavior: Emerging caddis break through the surface film, leaving trailing shucks while attempting flight. Multiple insects transform simultaneously during heavy hatches.
Where Trout Eat It: Fish feed on emergers and adults in runs, along riffle edges, and in tail-outs where concentrated emergence occurs during peak activity.
How to Fish It: Dead drift or add subtle twitches for caddis skating behavior. The visible post aids tracking during low light conditions.
Best Water: Focus on riffle edges with emergence activity, runs with moderate current, tail-outs collecting insects, and seams.
Strike Type: Watch for visible rises or expanding surface rings as fish take adults or emergers.
Fishing Strategy
Rigging Suggestions: Fish on 9-12 foot leader with 4X-5X tippet. Can serve as lead fly in dry-dropper rig, providing both surface indicator and fish-catching capabilities.
Seasonal Timing: Most effective during mayfly hatches April through June and caddis activity May through September. Peak productivity occurs when water temperatures reach 52-62°F during morning and evening feeding periods.
Pro Tips: Visible wing post makes tracking easy in low light. Apply floatant to hackle and post while keeping body materials slightly dampened for proper positioning in the film.
Entomology
Adult caddis emerge from their pupal shucks at the water surface and immediately attempt to take flight, often leaving behind trailing shucks and creating surface commotion. Fish respond to both the emerging adults and the discarded shucks during concentrated hatch periods when multiple insects are transforming simultaneously on the water.
- Order
- Trichoptera
- Common Name
- Caddisfly
- Organism Type
- insect
- Life Stage
- adult
