I must be fishing over dumb trout, after reading about how great the mop fly is I bought a pack of several different colors, Tan, beige, gray, blue, & Chartreuse, been fishing he now for 3 weeks and only caught 1 trout on the mop, I fish 2 flys so to be fair the mop was my lead fly, I always had the mop on but I did change colors. The last count was Mop flys 1 trout my regular flys 19