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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.
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Miniature Eastern Sulphurs

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

Mayfly Species Ephemerella dorothea dorothea

These are sometimes called Miniature Eastern Sulphurs.
Ephemerella dorothea consists of two subspecies, which both produce excellent action. Ephemerella dorothea dorothea is a small species of Sulphur in the East, and Ephemerella dorothea infrequens (formerly Ephemerella infrequens) is one of the two main Pale Morning Dun hatches of the West. The remainder of this page focuses on the dorothea dorothea subspecies, and Ephemerella dorothea infrequens is discussed separately on its own page.

This is one of the most challenging mayfly hatches on Eastern waters. On many streams, it follows or overlaps hatches of the larger, lingering Ephemerella invaria.
Dorsal view of a Ephemerella dorothea dorothea (Ephemerellidae) (Pale Evening Dun) Mayfly Nymph from Paradise Creek in Pennsylvania
I keyed this nymph carefully under a microscope to check that it's Ephemerella dorothea.

Miniature Eastern Sulphurs

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