How to Fish a Mop Fly for Trout: 3 Easy Rigs
A Mop Fly is a soft, fuzzy nymph pattern that is most effective when it is presented close to the bottom with a natural dead drift. Its bright, mobile material makes it a practical option in off-color water, during high flows, or whenever trout are refusing smaller, more conventional nymphs.
Use a Mop Fly when visibility matters
The purpose of a Mop Fly is not exact insect matching. It is a high-visibility, active-looking option that can suggest a grub, larva, worm, or other food item. Use it when current is strong, water is slightly colored, or you want a fly that is easy for fish to find.
The Mop Fly from Fly Fishing Universe uses a tungsten bead to help it sink into the zone. That makes it a useful lead fly in a two-fly rig, particularly when a lighter trailing nymph needs help reaching depth.
Three productive Mop Fly rigs
Indicator nymph rig
Fish the Mop Fly as the lower fly, set your indicator deep enough to occasionally tap bottom, and mend line immediately after the cast. This is the simplest way to cover a long run.
Tight-line rig
Use the Mop Fly as the heavy anchor fly and trail a smaller nymph 12 to 20 inches behind it. Keep line off the water and lead the flies through short seams. The heavier fly creates depth; the trailing fly offers a smaller profile.
Dry-dropper rig
In shallow water, suspend a smaller Mop Fly beneath a buoyant dry fly. Keep the dropper short enough that the dry does not drag or sink.
Let the drift do the work
Do not strip a Mop Fly continuously in moving water. Start with a dead drift and occasional natural lift near the end of the swing. If fish are not responding, first change depth, then change the size or color of the fly.
Mop Fly FAQ
What does a Mop Fly imitate?
It is a general attractor pattern that can suggest larvae, grubs, worms, or other soft-bodied food.
Is a Mop Fly good in clear water?
It can be, but use a smaller, more muted pattern and make a careful presentation. In clear water, a natural drift often matters more than a bright fly.
Should a Mop Fly touch bottom?
It should fish near the bottom without hanging up every cast. An occasional bottom tick is a useful sign that the rig is deep enough.