Why Mop Flies Work When “Real” Flies Don’t.
The mop fly is controversial. It doesn’t imitate any specific insect, and purists tend to look down on it for that. But it gets fished a lot because it catches fish. The plush chenille body pulses in the current on its own, and trout, panfish, and bass seem to read it as something worth eating, whether it looks like a caddis larva, a scud, or just something meaty.
Why It’s Built This Way
The copper bead head adds enough weight to get the fly down without needing extra split shot in most situations. Size #10 is a versatile middle ground, big enough to hook solid fish, small enough to still get eaten in clearer or more pressured water. The body is tied with chenille and a dubbed thorax section to help the fibers stay in place after normal use.
Color Selection
- Chartreuse: A high-visibility option for stained water, overcast days, or low light at dawn and dusk.
- Hot Pink: Often fished during spawn season or in off-color water after rain, when a brighter color tends to get more attention.
- Orange: Leans toward egg or crayfish coloring, a common choice in fall or on rivers with spawning salmon or steelhead.
- Brown: A natural, general-purpose color that works across most conditions.
- Cream: A subdued option for clear water where bright colors might spook fish.
- Black: Useful in deep pools, dark bottoms, or low light.
How to Fish It
Euro nymphing: Rig it as your point fly on a two-fly leader. The bead gets it down quickly in moderate current. Watch your sighter for any hesitation and set on the slightest pause.
Indicator fishing: Set your indicator so the fly drifts close to the bottom. The bead usually provides enough weight on its own; add a small split shot only if you’re fishing deeper or faster water.
Dropper under a dry fly: Hang it 18 to 24 inches below a buoyant dry fly like an Elk Hair Caddis. Fish will sometimes ignore the dry and take the mop fly suspended below it.
Common Questions
Is fishing a mop fly considered “cheating”? That’s a matter of personal taste in the fly fishing world. It’s legal in most tournament formats, and plenty of anglers carry one for days when nothing else is producing.
What species will take a mop fly? Trout, panfish like bluegill and crappie, smallmouth and largemouth bass, and carp all take this pattern regularly.
How long does the body hold up? With normal care, rinsing after use and not storing it wet, the chenille holds its shape through a reasonable number of fish. The fibers may flatten over time but generally stay attached. Replace the fly once it loses its plush profile.
Can I add weight if I need to fish deeper? Yes. The copper bead handles most situations, but for water deeper than 6 to 8 feet or fast current, add a small split shot about 12 inches above the fly. Avoid adding so much weight that it kills the natural drift.
Specs
| Spec | Detail |
|---|---|
| Hook | Size #10, curved nymph hook, chemically sharpened, barbless |
| Hook Length | 14.2mm |
| Hook Gape | 6.6mm |
| Bead | Copper, weighted |
| Body | Ultra-chenille (plush microfiber) |
| Thorax | Dubbing with flash accent |
| Colors Available | Chartreuse, Hot Pink, Orange, Brown, Cream, Black |
| Recommended Techniques | Euro nymphing, indicator fishing, dry-dropper rig |
| Target Species | Trout, Bass, Panfish, Carp |
Look, I know the mop fly is controversial. Whatever. It absolutely destroys fish and I’m not apologizing for it. The mop material has that slow pulsing action that fish can’t resist. If you’re not catching fish with this you’re doing something else wrong.