The Pale Morning Dun CDC Emerger - Nymph - can be used to fool even the most wary of trout, fished in the surface film the wary trout will never be able to resist. The Pale Morning Dun CDC Emerger has the addition of the CDC to give this fly a natural floating mechanism therefore not requiring the need of floatant or other such artificial means of buoyancy. This Mayfly imitation is sure to bring in fantastic results, as it is a fly that I myself have readily at hand at all times.