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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Brown Duns

This common name refers to only one family. Click its scientific name to learn more.

Mayfly Family Ameletidae

These are often called Brown Duns.
See Ameletus for details. It is the only genus in this family.
Male Ameletus vernalis (Ameletidae) (Brown Dun) Mayfly Dun from the  Touchet River in Washington
Male Ameletus oregonensis (Ameletidae) (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana
Ameletus celer (Ameletidae) (Brown Dun) Mayfly Nymph from Swamp Creek in Oregon

Brown Duns

Scientific Name
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