Blowtorch Nymph: Materials, Tying Guide & How to Fish It

A confidence dry fly that imitates vulnerable emerging insects and consistently fools selective trout.

The X-Caddis is a versatile dry fly pattern designed to imitate caddisflies struggling to emerge from their pupal shucks. Its trailing shuck and low-riding profile create the appearance of a vulnerable insect, making it especially effective for selective trout during caddis hatches and mixed hatch situations.

Watch the X-Caddis Tying Demo

X-Caddis Materials List

Hook – Dry fly hook
Thread – Brown Semperfli Nano Silk, 18/0
Trailing Shuck – Tan Semperfli Poly-Yarn
Body – Semperfli Kapok dubbing
Underwing – Natural CDC
Wing – Comparadun deer hair
Floatant Pretreatment – High N Dry

Tools I used in this video

• Rambler Nomad Vise
• Stonfo Steeltech Bobbin
• Renomed Scissors
• Hair Stacker

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How I Fish the

X-Caddis

Where I fish it, how I present it, and why the X-Caddis has earned a permanent spot in my fly box—especially during caddis hatches and mixed emergences

When I Tie It On

I reach for the X-Caddis when trout are feeding near the surface but don't seem fully committed to high-floating dry flies.

  • Caddis hatches with emerging adults

  • Mixed hatches where fish are taking a variety of insects

  • Selective trout refusing traditional dry flies

  • Slow seams and slick water where fish get a long look

  • Any situation where insects appear trapped or vulnerable in the film

Its low-riding profile and trailing shuck create the appearance of an insect struggling to escape.

And vulnerable insects get eaten.

Where It Shines

The X-Caddis excels whenever trout are feeding in or just below the surface film.

  • During caddis hatches when adults are actively emerging

  • When trout refuse higher-floating dry flies

  • During mixed hatches involving both caddis and mayflies

  • On smooth glides and soft seams where fish get a long look

  • As a confidence fly when trout are feeding selectively

It often reveals whether trout want perfect adults…

Or vulnerable emergers.

Rigging Tip

Fish it as your anchor fly with a slimmer, more natural pattern above it.

Let the Blowtorch grab attention.
Let the top fly clean up the cautious eaters.

The Blowtorch is powerful — but it’s even stronger as part of a complete system.

Stop Guessing What to Tie On

When the bite slows down, these five Euro nymphs consistently produce. Download the exact patterns I trust on pressured water.

Download the 5-Fly System

Frequently Asked Questions

Central Pennsylvania brown trout caught on Blowtorch nymph dropper — early fall

Central PA brown trout caught on a Blowtorch dropper. Quick photo with my son, then released on a perfect early fall day.

What size Blowtorch nymph should I use?

Most of the time, sizes 14–18 cover the majority of situations. I lean toward a size 16 as my starting point — it’s versatile enough for technical water but still visible in faster seams. In higher water or when fish are aggressive, a 14 can draw more attention. When fish get selective, dropping to an 18 often makes the difference.

Is the Blowtorch good in clear water?

Yes — especially in smaller sizes. While the fluorescent tag makes it an attractor pattern, the slim body keeps it from looking overpowering. In very clear or pressured water, I’ll downsize and focus on clean drifts. It still triggers eats without spooking fish.

Can you fish a Blowtorch in a dry-dropper rig?

Absolutely. The Blowtorch works well as the dropper beneath a buoyant dry fly. Choose a lighter bead if you’re fishing it under a dry so it doesn’t overpower the float. It’s an excellent search pattern when covering pocket water or mixed depth runs.

What bead size works best?

That depends on depth and current speed. For most Euro nymphing situations, I use 2.8mm–3.3mm tungsten beads on sizes 14–16. In heavier water, I’ll go heavier to reach the strike zone quickly. In shallower or slower runs, stepping down in bead size keeps the drift natural.

When do I take the Blowtorch off my rig?

When trout stop responding to subtle nymphs, it’s often a sign they’re not willing to commit to small, natural presentations. That’s when I’ll switch tactics entirely and move to a larger profile — often a jig-style streamer like the Jig Bugger — to trigger a reaction strike instead of waiting for a perfect eat.

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