Nymph flies imitate immature aquatic insects that live below the surface of rivers and streams. Because trout feed underwater most of the time, nymph fishing is one of the most effective ways to catch trout year-round. Our nymph fly collection includes patterns that imitate mayflies, caddisflies, midges, stoneflies, and other subsurface insects trout commonly eat. These proven trout nymph patterns are designed to help anglers match the hatch and consistently catch fish in rivers and tailwaters.