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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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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.

Dorsal view of a Gomphidae Dragonfly Nymph from the Namekagon River in Wisconsin
Waxsmith
CANADA

Posts: 6
Waxsmith on Feb 11, 2011February 11th, 2011, 2:26 pm EST
I do know these nymphs are biggies alright, but just what is the average size of them, like their length in "mm"?
What is this supposed to look like, example please.
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 11, 2011February 11th, 2011, 4:33 pm EST
A.K.-

According to McCafferty, Gomphid (Clubtail) nymphs generally measure from 23-40 mm. (and rarely as long as 65 mm.) at maturity.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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