Many people ask how to fish a Mop Fly. One way is to strip it like a small Streamer as seen in the right to middle of this video (if you look closely). This rainbow trout came a long way to eat it. Most competition fly fishers prefer to tight line / Czech Nymph a Mop Fly, but you can also use an indicator. There are many ways to fish a Mop Fly effectively so have fun and experiment with what works for you.