Musky, short for muskellunge, have been called the fish of 10,000 casts and are one of the most challenging, yet rewarding, fish to catch on a fly. Musky have a large range–from northern Michigan, northern Wisconsin, and northern Minnesota through the Great Lakes region, north into Canada, throughout most of the St. Lawrence River drainage and northward throughout the upper Mississippi valley, extending as far south as Chattanooga in the Tennessee River valley.