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.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

Stream photos

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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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?Reliable Taxonomic keys to Species Level?

Fish4va
lansdale, PA

Posts: 1

Fish4va on Mar 31, 2008March 31st, 2008, 7:43 am EDT

I am looking for reliable keys, preferably published books or articles, that can be used to identify aquatic inverts to species level. I am currently using such sources as Pennak, Wiggins and Merritt & Cummins for both work and play. These sources are great at getting to genus level identification.

Does anyone have any suggestions?