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Duns: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.
Emergence: The transformation of a nymph or pupa into the adult winged stage of an insect. The term may refer to the emergence of an individual, or the daily or yearly event in which all individuals of a species emerge.
The Namekagon is not known as a Hex hatch river, for good reason: the hatch is extremely rare and localized, and there are often few if any trout where the Hexes are. During this trip I caught nothing and heard no risers, but it was still a memorable night out in the middle of nowhere.