Short answer: nymphing means fishing the immature, underwater stage of aquatic insects — which is what trout eat roughly ninety percent of the time. Get your fly to the right depth and drifting naturally, and everything else is detail.

Understanding nymphs and nymphing

As you stand by the river, you'll find a whole world hidden beneath its surface. In fly fishing, one of the major techniques focuses on using nymphs, and a multitude of nymphing techniques live in this category.

So what's a nymph? Simply, it's a stage in the life cycle of an aquatic insect. But for those passionate about fly fishing it's much more — a critical component in understanding and mastering the river. These insects, whether in larval, pupal, or emergent form, are the main food source for trout. They exist abundantly, hidden just beneath the rocks and gravel.

Brown trout nymphed out of a hole using an indicator setup with a heavy golden stone nymph as the point fly

Nymphing a brown trout out of a hole with an indicator setup where the point fly was a heavy golden stone nymph.

To get a better look at them, turn over riverbed stones. Underneath you'll discover a rich ecosystem of midges, mayflies, stoneflies, caddisflies, and other aquatic insects, all thriving in their prehatch state. Using a fine net and stirring up the gravel downstream lets you collect these nymphs — a vital step in understanding their role in the river.

Fly fishing with nymphs is a tactical approach. As seasons change and trout feeding habits evolve, knowing how to use nymphing effectively becomes an art form. Hafele, Hughes, and Morris cover this extensively in Seasons for Trout, which is worth borrowing from your library before you buy — it's a dense read and you'll know quickly whether it's for you.

Numerous patterns imitate these nymphs, and it's not always about an exact match — adaptability is key. Pheasant Tail Nymphs, Hare's Ear Nymphs, and Rubberlegs Stoneflies are popular choices. The primary goal is to present the nymph in a way that seems authentic to the trout.

Patterns and techniques

Patterns are crucial. As dawn breaks and the river comes alive, anglers are often crafting nymph patterns to mimic nature. These resemble aquatic insects during their vulnerable stages, and classics like Pheasant Tails and Hare's Ears are staples in any collection. While patterns matter, it's more about resemblance in silhouette and size — and ultimately the key is how you present them.

Alongside realistic or impressionistic patterns sits a myriad of what most call attractor patterns. These vary in color, size, and shape from true impressionistic flies. They keep a semblance of the insect and its phase but add detail meant as extra allure. I refer to them as the Willy Wonka versions of flies — and the debate is still out on whether the allure is for the fish or the angler.

Regardless, presentation is really the key. Fish are opportunistic feeders, and the likelihood of an eat relates more closely to presentation than to preferred diet or fly. That's why I built the OSSCP Fly Selection Formula with Presentation as the element that outranks the rest.

Achieving the right depth

Nymphing is all about depth. Presenting your nymphs where trout feed, especially near the river's substrate, is the difference between success and frustration.

When I first tried fly fishing on the Madison River, despite my enthusiasm, success was elusive. After some guidance I learned that the weight of my rigging was inadequate — I simply wasn't reaching the trout's feeding zone. Achieving the right depth is an art and requires various techniques, so I leaned on my mentor, Todd Jurgensen, for advice.

Cutthroat trout taken from a deep hole while modern nymphing with heavier flies

After repeatedly hooking whitefish, this beautiful cutthroat came out of a deep hole while I was modern nymphing. The addition of heavier flies let me get deeper faster and effectively fish the head of the pool.

Mending line, and why

The mend is critical because it addresses line drag as your line crosses multiple currents. Say there's a fast current in front of you and your indicator lands in slower water beyond it. You cast and mend upstream, letting your line fall on the water above your indicator but still within the faster current. That faster, stronger current carries your line down to the indicator, and you mend again the same way.

Doing this prevents the line in the fast current from dragging your indicator through the slow water. That matters because the indicator's placement determines the depth, location, and speed of your nymph. If the indicator is dragging, the nymphs are dragging. And when I say indicator, I mean any indicator — a grasshopper in a dry-dropper setup is your indicator just as much as a plain old bobber.

Dry-and-dropper

Best during hatches. It uses a buoyant dry fly, like a hopper or a Parachute Adams, with a nymph attached below. The dry serves as an indicator while the nymph gets into the feeding zone. Most commonly I see anglers tie their dropper off on tippet that isn't long enough to be effective. Trout tend not to move as much as we think unless provoked, so the key is being in the right location to entice a move, or better yet trigger an eat.

The Hopper Dropper Assortment is built for exactly this rig.

Indicator nymphing

Suitable for beginners and advanced anglers alike, this uses a floating indicator — but to get it right, mending is essential. What I love about indicator nymphing is that there are almost endless ways to configure your leader above and below. There are also indicators of all types — Thingamabobbers, wool, foam, and stick-on versions are just a handful of examples. All have their pros and cons.

Indicator nymphing rig set up on a river

High-sticking

This is all about depth. Use a weighted nymph and watch the line for any hint of a bite. The biggest difference between high-sticking and Euro or modern nymphing is the use of split shot or added weight rather than relying on fly weight alone.

High sticking technique on fast pocket water

Short-lining

A slight variation of high-sticking, ideal for faster sections. It requires heavy flies to achieve depth quickly, weight is often added, and the shorter the line or leader in the water, the less drag. Fishing the riffles this way can be absolutely deadly, and riffles are often overlooked. I highly recommend setting your rod up for this and committing time to it — for example, fish this way for a week no matter what happens.

You can learn all the details of these techniques and far more in Dynamic Nymphing by George Daniel. It's widely available on Amazon and through fly shops, and your local library may well have it or be able to get it through inter-library loan.

Modern nymphing techniques

Euro nymphing has rapidly gained popularity. Originating from European practices, this method is now adopted by many anglers eager to engage with rivers at a deeper level.

Euro nymphing, also known as European-style nymphing (ESN), has stirred debate in the community. Its evolution into what's now called modern nymphing can be attributed to global competition and the blending of techniques. Derived from competitive fly fishing, it integrates the best methods with an emphasis on accuracy and understanding the river.

This runs the same path as Bruce Lee's development of Jeet Kune Do — breaking traditional philosophy by adapting the best techniques from each historic practice and modifying them where necessary. Just like fighting arts, there's no complete consensus on what's best or even ethical. Personally, I love that there's always turmoil driving continued questioning and new technique development.

Modern nymphing is characterised by specific equipment. Anglers use longer, lightweight, highly sensitive rods, typically 10 to 11.5 feet in the 2-4 weight range. These ensure precision in presenting flies and let you better sense the river's flow. Our JHFLYCO Euro Nymph Combo 9'0" 4WT, the Wild Water Euro Nymphing Kit 3wt 10ft, and the 23PS Nymph Combo are all built for it.

In this approach, casting relies less on fly line weight and emphasises a direct connection to the nymph, which offers more immediate interaction with the fish. Fly lines often stay on the reel with monofilament the only line exposed to the guides. Below the sighter portion, the tapering leader is constructed of light but tagged tippet lengths to provide multiple fly opportunities and extra-light tippet to avoid drag in the water column.

Modern nymphers tend to use specifically weighted nymphs instead of split shot, adjusting to the river's flow. The key is understanding the balance between weight and friction to achieve depth. Brightly colored sighter lines, usually yellow, red, or pink, help detect even the slightest takes.

A trick I've learned is to cut your bi-color sighter section in the middle and re-tie it with a blood knot. Leave the tags — they make subtle movement far easier to see when you're getting a take. (My knots guide covers the blood knot with a video.)

I've found modern nymphing particularly effective where trout are especially cautious. It narrows the gap between angler and fish, akin to fishing small dry flies, and the concentrated approach makes for exciting catches. It's the closest experience I've had to watching a dry fly get taken from the top — when I'm concentrated, diligently watching the sighter, and the slightest movement indicates an eat, I get that same feeling of duping the fish.

For those keen to learn more, Devin Olsen's Tactical Fly Fishing: Lessons Learned from Competition for All Anglers is excellent. Available on Amazon, at fly shops, and often through libraries.

Swinging flies

Swinging flies is an age-old technique that has stood the test of time, and one many seasoned anglers swear by.

It's an art focused on presentation, imitating the movement of insects as they emerge. The fly is cast across the river or slightly downstream and allowed to drift and move naturally, attracting discerning trout. Again, presentation is free — so mending appropriately, so the fly drifts into the zone in a natural motion, greatly increases your odds.

Large brown trout taken on a wet fly fished as a dry dropper on the Green River, Utah

This tank was taken on a wet fly used on a dry dropper on the Green River, Utah.

One memory that stands out is being taught wet flies by an old friend, Tom Blews. The experience felt like being let in on a guarded secret. The fly, simple in design yet effective, exemplified the essence of the technique. Tom lowering his voice, leaning in, and looking me in the eyes made me realise he was passing along something personal — something likely taught to him that he felt compelled to share with only the ones he trusted. Luckily, I later found he was just a grateful guy who'd share that secret with anyone. It really was his pride and joy, and his confidence tactic.

With swinging flies, detecting a strike relies heavily on observation and intuition. Watch the line carefully for any hint of a bite, and when you feel or see that subtle movement, set the hook. A strip set helps, as it retains line tension and a direct connection to the fly. In most cases, as I was taught, the fish do most of the work. "You'll feel them take and they'll set the hook themselves. Bad news is you'll lose more fish than you normally do, Christian. The good news is, there are always plenty more."

For many, swinging flies is more than a method; it's an immersive experience connecting you to the river's rhythm. I imagine the olden days in the UK, anglers experimenting and logging their trials and tribulations while smoking cigars and pipes.

Last of all, don't overlook standard nymphing techniques for wet flies. These deadly emerger patterns are often fantastic under indicators or hoppers. What I find effective is positioning them higher in the water column and purposefully fishing them in slightly faster water to the right or left of the slower water. That provides a little drag, pulling the wet fly and allowing it to rise in the column like an emerging insect. Often my takes come shortly after the indicator hits the water and the lower fly begins to rise under tension.

The ultimate learning tool for wet fly fishing and tying is Wet Flies: Tying and Fishing Soft-Hackles, Flymphs, Winged Wets, and All-Fur Wet Flies by Dave Hughes. Dave takes you on the adventure of wet flies and the deadly flymph-style flies that are easily tied. Worth checking your library for — and if you'd rather fish them than tie them, our Crystal Woolly Bugger Assortment and wet fly article will get you started.

As I wrap up this discussion on nymphing and swinging flies, I encourage fellow anglers to dive deep, explore, and cherish the joys of fishing. May your adventures be full of discoveries, and may your nets always be wet.