Nymph Flies represent bugs that live underwater. Generally the nymph fly is in one of the early life stages of most common aquatic insects. Popular Nymphs like Mayfly Nymphs, Caddis Nymphs, Midge Nymphs and Stonefly Nymphs imitate species that live underwater before they mature and hatch on the water's surface.
This section also includes other flies that you fish along the stream bottom. Egg Flies that represent eggs of other fish. Scuds and Sows are small crustaceans that look like small shrimp or crawdads, they spend their whole lives in the water.