Fly
Dry flies, nymphs and streamers: three categories, three depths
A fly shop wall holds a thousand patterns. They are three ideas, and one of them catches most of the fish.
By Sawyer V. · Last updated · How we pick
The short answer
Dry flies float on the surface, nymphs drift below it, streamers are stripped through the water like a small fish. Nymphs catch the most trout by a wide margin, because trout do most of their feeding underwater. Dry flies are the most enjoyable. Streamers catch the biggest fish.
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Three categories, and depth is the difference
| Type | Where it fishes | Imitates | Bite detection |
|---|---|---|---|
| Dry fly | On the surface | An adult insect | You watch the fly disappear |
| Nymph | Drifting below the surface | An insect larva | An indicator, or the line stopping |
| Streamer | Stripped through the water | A small fish or leech | You feel it, like any lure |
That is the whole taxonomy. Wet flies and emergers sit between dry and nymph; poppers are surface streamers for bass. Every pattern on the wall is a variation inside one of these.
Nymphs: what actually catches trout
The uncomfortable statistic first: trout do the large majority of their feeding below the surface. Insects spend most of their life cycle as larvae on the riverbed, and only a brief window as adults on top.
So a nymph drifting near the bottom is imitating what trout eat most of the time, and it out-fishes a dry fly on most days by a wide margin.
The technique is a dead drift: the fly moves at exactly the speed of the current, with no drag from the line. This is why nine-foot rods exist — mending line to prevent drag is most of the work.
Bite detection is the hard part, because you cannot see it. Most people use a strike indicator — a small float, exactly like the slip float on a spinning rod, doing the same job for the same reason.
Two patterns cover an enormous amount of water: a Pheasant Tail and a Hare’s Ear, in sizes 14 to 18.
Dry flies: fewer fish, better fishing
A dry fly floats, and you watch a trout come up and take it. It is the most visually engaging thing in fishing and it is why many people take up fly fishing at all.
It is also conditional. Dry fly fishing works when adult insects are on the water and trout are looking up for them — a hatch. Outside a hatch you can fish a dry all day and catch very little.
The practical instruction: look at the water before choosing. Rings on the surface mean fish are feeding up. No rings means fish a nymph.
Two patterns to start: an Adams and an Elk Hair Caddis, sizes 14 to 18. Between them they approximate a large share of what hatches on trout water.
Streamers: the biggest fish
A streamer imitates a small fish, a leech or a crayfish, and you strip it back in pulls rather than drifting it. Mechanically this is the closest fly fishing gets to fishing a swimbait, and the bite is a solid pull you feel.
Big trout are predators. A fish that has stopped eating insects and started eating other fish is exactly the fish a streamer targets, which is why streamer anglers catch fewer and larger fish.
They are heavier and more wind-resistant to cast, which is the main reason a 6-weight exists.
One pattern covers most of it: a Woolly Bugger, in black or olive, sizes 6 to 10. It is arguably the single most effective freshwater fly there is, and it also catches bass, panfish and pike.
The first dozen
Buy fewer patterns in more sizes rather than more patterns in one size. Size is more often the reason a fly is refused than pattern is.
| Pattern | Type | Sizes |
|---|---|---|
| Pheasant Tail | Nymph | 14, 16, 18 |
| Hare’s Ear | Nymph | 14, 16 |
| Adams | Dry | 14, 16, 18 |
| Elk Hair Caddis | Dry | 14, 16 |
| Woolly Bugger | Streamer | 8, 10 |
That is around a dozen flies and it will fish a trout stream through a whole season. Buy two of each — you will lose them in trees.
Fly boxes are cheap and worth having immediately, because loose flies in a pocket rust and tangle. The same storage logic applies as to any other hook.
Choosing on the day
Fish rising, rings on the surface: dry fly, matched roughly to the size of what is flying.
Nothing showing, normal conditions: nymph. This is the default and it is right most days.
High or colored water, or you want a big one: streamer.
Cold water: nymph, deeper and slower. The same reasoning as the jerkbait pause in spin fishing — a cold fish will not travel far for food.
So what do I actually buy?
Flies themselves are cheap and we do not have published spec tables for individual patterns, so the honest recommendation is the gear that fishes them.
Orvis Clearwater Fly Rod Outfit (9 ft 5-weight)
$479.00A 5-weight outfit fishes all three categories acceptably, which is the point of a 5.
#ad how this is funded · price as of October 12, 2026
Scientific Anglers Air Cel WF Floating Fly Line
$39.95A floating line covers dries, nymphs under an indicator and shallow streamers.
#ad how this is funded · price as of October 12, 2026
Thill Pro Series Slip Bobber Float
$4.78A small float works as a strike indicator for nymphing — same job, same principle.
#ad how this is funded · price as of October 12, 2026
Questions people actually ask
What is the difference between a dry fly and a nymph?
Depth. A dry fly floats on the surface and imitates an adult insect; a nymph drifts below the surface and imitates a larva. Trout do most of their feeding underwater, so nymphs catch considerably more fish.
Which fly should a beginner start with?
A nymph — a Pheasant Tail or Hare's Ear in size 14 to 16 — because it matches what trout eat most of the time. A Woolly Bugger is the single most versatile fly if you only buy one pattern.
When should you fish a dry fly?
When you can see rings on the surface, meaning fish are feeding on adult insects. Outside a hatch you can fish a dry fly all day and catch very little, because the fish are not looking up.
How many flies do you need to start?
About a dozen, in five patterns across a few sizes. Buy fewer patterns in more sizes rather than the reverse — size is more often the reason a fly is refused than pattern is.
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