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.

Stream photos

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Coleoptera (Beetle) Insect Larva Coleoptera (Beetle) Insect Larva

Lateral view of a Coleoptera (Beetle) Insect Larva from Sears Creek in Washington

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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.

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.

Definition of 'nygma'

Nygma: A small, hardened sensory spot lying within Fork II (near its base) in the wings of most caddisflies.

This other word references the same concept: nygma.

The tiny nygma of this Hydatophylax argus caddisfly's forewing is boxed in green. — The tiny nygma of this *Hydatophylax argus* caddisfly's forewing is boxed in green.

Hex MayfliesHexagenia limbata

Definition of 'nygma'

Definition of 'nygma'

Hex Mayflies
Hexagenia limbata