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Fly Selection Part 2 – Dry Flies vs. Nymphs

Last month, I talked about ways to simplify your fly selection and offered tips on how to choose flies based on season and what was hatching. Based on the number of questions I had, however, I left out an important part of the process. Many folks said they are often uncertain when to fish a dry fly vs. a nymph.

As you might imagine, there are a lot of variables and there is not a simple answer like fish nymphs before noon and dries after. The truth is, in places like the Smoky Mountains, when conditions like water temperature and water level are ideal, it often doesn’t matter. There have been plenty of days when I’ve fished with my buddy Brian, going up the stream together and taking turns fishing. He was fishing nymphs or wet flies and I was fishing dries, and we caught about the same number of fish. When conditions are right and the trout are actively feeding, they’ll typically feed on both.

So when the conditions are great and you could fish either, how do you decide? Sometimes it just boils down to personal preference. I happen to think fishing with dry flies is more fun, so I’m often going to choose a dry fly in those instances. But it also depends where I’m fishing. If it’s purely a rainbow or brook trout stream, I’m highly likely to fish dries. But brown trout are more reluctant to feed on the surface, so if there’s a chance of catching a bigger brown, I’m more likely to fish nymphs.

Some people choose to fish dry flies because they think it’s easier. Nymphing requires you to read the water three dimensionally, meaning you have to factor in the depth as well as the surface currents. And there is more stuff, like split shot and sometimes strike indicators, that can lead to more tangles for less experienced anglers. On the other hand, one of the most experienced fly fishermen I know chooses to fish nymphs in smaller, pocket water streams for a similar reason. He says he can cover more water and catch more fish because he’s not spending so much time drying and redressing his dry fly after every fish. It’s a great point. Keeping a dry fly floating in smaller mountain streams, especially when you’re catching a lot of fish, can require a lot of time and effort.

So when the conditions are great and you could fish either, it’s really just going to come down to your personal preference and fishing style. But what about when conditions are not ideal? What are some “less than ideal” conditions that might dictate the use of one fly category over another?

The first one that jumps to mind is water temperature. If you’re fishing early or late in the year when the water temperature is in the 40’s (or colder), there will be fewer insects hatching and the fish are going be more lethargic and less willing to come to the surface to feed. While you can sometimes coax fish to the surface in these conditions, you’ll likely have far greater success fishing nymphs near the bottom where the fish is already seeing most of its natural food and where it doesn’t have to expend as much energy.

High water is another one. When water is high, many of the channels are moving too fast at the surface. In pocket water, the water that normally goes around the rocks is going over them and eliminating the holding pocket. Fish will not only have a tougher time seeing food on the surface, they will have to work too hard to get it. While there can sometimes be fish surface feeding in back eddies, etc. in high water, you’ll likely be far more successful drifting nymphs closer to the bottom.

Low water can be the opposite. Fish don’t quit feeding on nymphs when the water gets too low, but it gets very difficult to fish with nymphs in these conditions because you’re frequently hanging the bottom. Can it be done? Absolutely. But you’ll have a much easier time fishing dry flies in these conditions.

The other situation worth mentioning is fishing for trout in tailwaters. While there are exceptions, most tailwaters are not known for their diversity in aquatic insects. Rather they’ll usually get one good mayfly hatch and/or one good caddis hatch and that’s it. The Clinch River is a perfect example. It gets a great sulfur (mayfly) hatch in May and June and that’s it. During that timeframe, the dry fly fishing can be pretty darn good. The rest of the year their diet mostly consists of midge larvae, scuds, and sulfur nymphs.

Even when tailwater trout can be observed surface feeding on adult midges, you can usually catch fifteen trout below the surface for every one you can catch on top. Tailwaters almost always lend themselves better to nymph fishing.

Finally, if you want to get scientific about the whole thing, it is estimated that anywhere from 65-90% of a trout’s diet comes from below the surface. And it makes sense, particularly when you consider that the typical aquatic insect spends one to four years as a nymph and one day to two weeks as an adult. So really, we fish dry flies because it’s fun and sometimes easier. If your primary goal is catching big fish and/or more fish, learn how to fish nymphs.

Learn more about Smoky Mountain hatches and flies in my hatch guide.

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Fly Selection – Making Sense of It All

If you are new to fly fishing, particularly for trout, it is easy to be overwhelmed by the number of fly patterns available. Which ones do I need? What colors? What sizes? Do I need all of them? First of all, if you tried to carry every trout fly with you, you’d need a wheelbarrow to go fly fishing! While there is no way to make it immediately simple, there are ways to simplify the process. As with many things in fly fishing, you try to find a good starting point and learn as you go from there.

Sulfur mayflies can come off in bunches on the Clinch in May, and you better have a good imitation

First, it is important to realize that there are many fly patterns that are designed to imitate a very specific bug when it is hatching and may only be relevant on certain rivers at a specific time of year. Some are even designed to imitate certain stages of that hatching insect’s emergence. Some of these hatches may involve hundreds of bugs coming off for hours out of the day, and maybe over the course of several weeks. When that is the case, the fish can get highly selective and may ignore anything that doesn’t look like what is actually hatching. You need to “match the hatch.” The heavier the hatch is, the more selective the fish can become, and they may even focus on one stage of the emergence. For instance, they may opt to ignore the nymphs and adults, and purely key in on emergers just under the surface film.

This kind of situation can be exciting and frustrating at the same time while you try to unlock the puzzle. But these situations are rare. Most of the time, particularly in smaller mountain streams like the Smokies, you’re not going to see many heavy hatches. Rather, there will be sporadic small hatches of a few different types of bugs. And the fish rarely key in on one specific bug. They can’t afford to. Often, there won’t be anything hatching at all.   So, a good starting point with trout flies is with a basic selection of attractor patterns in their most common size(s).

The Parachute Adams is one of the most universal topwater trout flies in the world

Attractor fly patterns, also referred to as generals, generics, or prospecting flies, are not designed to imitate anything in particular. They will either be rather drab looking flies, like a Parachute Adams, that look similar to a lot of food items. Or they may be something with some color that doesn’t look like anything at all, like a Royal Wulff, intended to trigger a feeding response from a trout. In most situations, if you have a basic selection of attractors and you present them well, you can catch trout anywhere in the world.

Many of you may have seen, or even purchased, the Great 8 fly selection from my online store. That’s exactly what it is – a collection of eight dry, nymph, and streamer fly patterns that will work on trout most anywhere in the world.   Now if you ask ten different fishermen their eight must-have fly patterns, you won’t get the exact same answer. But I guarantee you’ll see a lot of similarity and crossover. A simple selection of these types of flies is a great place to start your fly collection. From there, you just gradually add fly patterns based on multiple sources and scenarios.

Maybe your buddy told you he did really well at Tremont on a size #12 Yellow Humpy. Pick up a couple and give them a try. Or maybe the guy at the fly shop said people have been doing well on #16 Copper Johns. Pick up a few of those. Or maybe you purchased my hatch guide for the Smokies and it indicated there should be good hatches of Light Cahills when you were coming. Better have a couple of Light Cahill patterns with you. There are hatch guides and charts for most every popular trout fishery in the country and they can be very helpful. And the folks at the local fly shops are great sources for information. When they’re not fishing, they’re in the shop talking to people who have been fishing, so they almost always have the most up to date information. After doing that for a while, you start to accumulate a lot of fly patterns. And through the process, you start to find your own personal favorites.

So, now that you have all of these patterns, how do you know what fly to fish when? Fly selection is about 1/3 experience, 1/3 scientific, and 1/3 dumb luck. If you fish an area a lot, you will begin to draw from past experiences to choose your fly. If I am fishing the Smokies in June, I don’t have to actually see a beetle get eaten by a trout to make me decide to tie on a beetle pattern. For decades, I’ve done well on beetles in June. It will probably be one of the first flies I tie on.

Are you seeing a lot of these?
Try something like this

I might use a more scientific approach on water that is less familiar, or even on familiar water when something unusual is happening. The scientific approach could be reading something like a hatch guide and choosing a fly accordingly to match the flies that should be hatching. Or you could be on the water and see fish feeding on the surface. If you see an abundance of natural insects on the water or coming off the water, catch a couple in your hand and try to find an imitation in your box that is close in size, color, and profile. You can do the same thing with nymphs by turning over a couple of rocks and choosing a fly that resembles what you see.

The dumb luck method is just what it sounds like. The biggest brook trout I ever caught in the park came on a day when the fishing was tough. None of my usual patterns were producing and I wasn’t having much luck matching naturals. I finally dug through my box and saw a fly that I hadn’t even thought of, much less fished, in the last ten years. I figured I couldn’t do much worse so thought I would try it and ended up catching several fish on it, including that big brookie. Don’t be afraid to experiment.

Probably the most import thing to remember is that it is more often the archer, not the arrow. Too many fishermen blame their fly for a lack of success. With the exception of super big, technical hatches, specific fly patterns are probably not as important as most people make them. Approaching the fish without spooking them and putting a good drift over them with a “reasonable” fly pattern will catch fish most of the time.

Someone smarter than me once said that most people’s favorite fly is the fly they happened to have on the first time the fishing was good. In other words, the fish were feeding well that day and probably would have hit most anything. But from that day forward you have confidence in that fly. It’s often the first fly you tie on and it’s the one you leave on the longest. There’s a lot to be said for confidence.

Most of the big brown trout, probably 75%, I’ve caught in the Smokies have come on a Tellico Nymph, which might lead some people to believe there is something extra special about that fly. The truth is I spotted most of those big brown trout before fishing for them, and I usually tie on a Tellico Nymph when I fish to a big brown. Know why? It’s the fly I happened to have on the first time I caught a big brown in the Smokies. There’s a lot to be said for confidence.

Learn more about Smoky Mountain hatches and flies in my hatch guide.

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Flies: Blue Wing Olive

Winter seasons are not typically known to produce large hatches of aquatic insects, particularly in our part of the country. However, if you’re going to run into a hatch worthy of bringing fish to the surface during the cold winter months, it’s likely to be a hatch of Blue Wing Olive mayflies. Blue Wing Olives, or BWO’s as they’re commonly called, are one of the most erratic hatches that I know of. While most aquatic insects hatch at fairly predictable times of the year, BWO’s are likely to come off anytime of the year, typically on the crappiest day imaginable.

Parachute Blue Wing Olive

I can remember guiding someone in the park several years ago in early May, a time when we’re usually seeing good sulfur hatches (and about anything else yellow). We had an unusual and harsh cold front come in where highs were hitting 50-degrees at best. It was cold, windy, and raining and the fish had more or less shut down. We’d had a tough morning to say the least and while shivering through lunch, we were considering calling it in.

I suggested hitting one more nearby pool and to our surprise, it had fish rising in it… a lot of them. Without giving it much thought, I tied a sulfur on his line since that’s what had been hatching… Every. Single. Day. But when he began fishing to them, the sulfur imitation repeatedly drifted through rising trout, untouched. So I switched him to a different, smaller sulfur pattern. Same result. Then, I switched him to a sulfur emerger. Nothing.

Blue Wing Olive Comparadun

I was making a mistake that a lot of fishermen make. I was making decisions based on what the fish had been or should be doing rather than paying attention to what they were doing. I finally waded out to the channel in the very back of the pool where I wouldn’t disturb the fish and focused closely on the surface of the water. What I found was not the size #16 sulfurs that had been hatching for the last week. Instead, I saw dozens and dozens of size #20 BWO’s. Fly selection is 45% experience, 45% science, and 10% dumb luck, and I had been relying 100% on experience! We made the appropriate fly change and were into fish for a solid four hours before the hatch ended and the fish went cold again.

Beadhead Olive Pheasant Tail Nymph

There are a lot of morals to this story but the one most relevant to the topic of this article is that BWO’s can hatch anytime. And they usually like to hatch on the foulest of days. With that said, don’t rush out to the Smokies in February because Rob Fightmaster said there would be a great BWO hatch. But if you’re on the water in less that ideal conditions and fish are rising, look for BWO’s. If you don’t see anything but just want to try something on the top, try a #18 or #20 BWO. I ALWAYS have at least a few BWO’s in my fly box in these sizes. I carry different versions but prefer something with a dark olive body and medium dun hackle in a parachute or comparadun style pattern.

Again, a hatch can occur at most anytime but you’re most likely to encounter them between late fall and early spring, at least in this part of the country. And you’re just as likely to see them hatching on a tailwater as you are in the mountains.

Of course, for every fishing eating a BWO on the surface, there are probably five eating a BWO nymph. The nymphs are also usually dark olive in color and can typically be imitated with an olive Pheasant Tail or olive Pheasant Tail nymph. Both are good choices during a hatch or just blind “nymphing” in the winter months.

Learn more about Smoky Mountain hatches and flies in my hatch guide.

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Flies: Blue Quills

Blue Quills represent one of the first good mayfly hatches of the year in the Smokies. By “good,” I mean they can come off in big enough numbers and with enough consistency for trout to really take notice. As with most aquatic insects, water temperature determines when they hatch and being an early season bug, there can be as much as a three week variation from year to year.

Blue Quill Dry Fly

In the Smokies, we tend to see them begin hatching in late March and continue through the third or fourth week of April. With a warmer than average February, they can get started a little earlier or they may get going a little later in a cold spring.

They tend to hatch sporadically through the day with the heaviest activity occurring between noon and 4:00pm. Water is often higher and faster this time of year, so pay close attention to soft current edges, eddies, and slow pockets for trout feeding on them. Water temperatures also tend to be chillier this time of year, which can retard emergence. An un-weighted nymph fished in the surface film or just below can be very effective, particularly on cooler, damp, or overcast days.

Bead Head Pheasant Tail Nymph

The nymph is a reddish brown color and typically a size #16 or #18. The bugs tend to get smaller as the hatch progresses, so while we’ve mostly been seeing #16’s, expect #18’s to be more common in the coming weeks. There are specific Blue Quill nymph patterns but a standard Pheasant Tail Nymph works as well as anything.

The adults also have a reddish brown body with a light to medium dun wing and are also found in sizes #16 and #18. Again, very specific Blue Quill dry fly patterns are available but a Parachute Adams serves as a worthy imitation.

Learn more about Smoky Mountain hatches and flies in my hatch guide.