I'll be honest, the first time I tried tying a mop fly, I felt a little bit like a cheat. There I was, sitting at a desk covered in high-end hackle and expensive synthetic dubbing, but I was holding a piece of a $5 floor mat I'd bought at a discount store. It felt wrong, almost like I was bringing a microwave dinner to a five-star potluck. But then I took that weird-looking thing to the river, and the local trout absolutely hammered it.
If you're new to this, or even if you've been at the vise for decades, you've probably heard the debates. Is it even a fly? Is it a lure? Does it count as "real" fly fishing? My take is pretty simple: if it's made of fiber, tied on a hook, and catches fish when nothing else will, I'm putting it in my box.
Why This Weird Little Fly Actually Works
Before we get into the nitty-gritty of tying a mop fly, it's worth asking why a piece of a cleaning supply is so effective. If you look at a wet mop strand in the water, it has this undulating, wiggly motion that mimics a lot of high-calorie snacks trout love. Think big crane fly larvae, fat grubs, or even those oversized caddis larvae you find under rocks in the spring.
It's basically a "suggestive" pattern. It doesn't look exactly like one specific bug, but it looks like something delicious and easy to catch. Plus, the microfiber material holds onto air bubbles and has a specific texture that fish seem to hold onto a split second longer than they do with hard plastics or stiff feathers. That extra second is usually all you need to set the hook.
Gathering Your Gear Without Breaking the Bank
One of the best things about tying a mop fly is that the materials are incredibly cheap. You don't need to hunt down a rare bird skin or spend thirty dollars on a specific patch of fur.
First, you need the "mop." You can buy these at fly shops now, often labeled as "mop chenille," but you can also just go to the cleaning aisle of any big-box store. Look for those microfiber wash mitts or floor mops with the long, fat "fingers." They come in every color imaginable—neon green, tan, grey, cream, and even purple.
Next up is the hook. I'm a big fan of using jig hooks for these. Since the mop body is pretty heavy once it gets wet, a jig hook paired with a slotted tungsten bead helps the fly ride hook-point up. This is a game-changer because it means you'll snag the bottom way less often while you're bouncing it along the rocks. For size, I usually stick to a #10 or #12, but you can go bigger if you're chasing bass or smaller for finicky creek trout.
Finally, you'll need some thread and maybe a bit of dubbing for a "collar." Use a strong thread—something like 140 denier or 6/0—because you really want to cinch down on that mop material to make sure it doesn't spin or slide around the hook shank.
The Actual Process of Tying a Mop Fly
Alright, let's get into the actual work. Tying a mop fly is probably one of the fastest patterns you'll ever learn. Once you get the rhythm down, you can crank out a dozen of these in twenty minutes.
- Prep the Bead: Slide your bead onto the hook and get it in the vise. If you're using a jig hook, make sure the slotted part of the bead is facing the right way so it sits snugly against the eye.
- The Thread Base: Wrap your thread from the bead back toward the bend of the hook. Don't be shy with the wraps; we want a nice, grippy surface.
- Preparing the Mop: Pull a single strand off your mop mitt. Here's a little secret: the end you cut off is going to be messy. I like to take a lighter and very quickly singe the cut end. This melts the fibers together and stops the whole thing from unraveling while you're fishing.
- Securing the Body: Place the singed end of the mop strand on top of the hook shank, right behind the bead. Give it a few loose wraps to get it positioned, then pull tight. You want to see the material compress. This is where that strong thread comes in handy. I usually wrap back toward the bend a little ways and then back up to the bead to really lock it in.
- The Collar (Optional but Recommended): Most people like to add a little "hot spot" or a bit of buggy dubbing right behind the bead. This hides your thread wraps and adds a bit of extra life to the fly. Use a pinch of ice dub or some hare's ear, wrap it a couple of times, and you're golden.
- Whip Finish: Tie it off, add a drop of head cement or super glue if you're paranoid like I am, and you're done.
Choosing the Right Colors
When you start tying a mop fly, the temptation is to make them in every color of the rainbow. While that's fun, there are a few "must-haves" that seem to produce better than others.
Chartreuse is the undisputed king. For whatever reason, trout (and especially stocked trout) lose their minds for that bright neon green. It's my go-to when the water is a little off-color or if I just need to get their attention.
Cream or Tan is my second favorite. These look a lot more like natural crane fly larvae. If I'm fishing a river that has a lot of natural insect life and the fish are being a bit picky, I'll switch to a tan mop. It's less "look at me!" and more "here is a boring, easy lunch."
Grey or Mottled Brown can be surprisingly effective in clear water. It looks like a big grub or a drowned terrestrial. Don't sleep on dark colors, either. A black mop fly can be a killer during a dark-colored stonefly hatch or in the evening when you want a strong silhouette.
How to Fish the Mop Fly Without Looking Like a Total Amateur
Once you've finished tying a mop fly, you have to actually fish the thing. The most common mistake I see is people treating it like a streamer and stripping it through the water. While that might work once in a blue moon, this fly is designed to be fished deep.
The best way to fish a mop is under an indicator or using a "Euro nymphing" setup. You want that fly tumbling along the bottom. Because the mop material is so buoyant, the tail will actually float up slightly while the heavy bead keeps the head on the rocks. This creates a "tail-up" posture that looks exactly like a bug trying to burrow into the gravel.
If the drift feels a bit stagnant, give your rod tip a tiny little twitch. That's usually when the strike happens. That microfiber tail will kick just enough to trigger a predatory response from a fish that was just watching it float by.
A Few Final Thoughts on the Mop
I know some folks think that tying a mop fly is the end of fly fishing as we know it. They'll tell you it's too easy or that it doesn't require "skill." But honestly? I think anything that gets people excited about being on the water is a win. Plus, there's something genuinely satisfying about taking a mundane household object and turning it into a tool for catching beautiful fish.
It's a great pattern for kids to learn on because it's hard to mess up. It's also a great "confidence fly" for when the fishing is tough and you just need to see a bobber go down to keep your spirits up. So, the next time you're at the store and you see a bright green microfiber car wash mitt, don't walk past it. Buy it, bring it home to your vise, and start tying a mop fly. Your fly box (and the fish) will thank you.