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.

Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

9 Recently Added Photos

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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Male Stenonema ithaca (Light Cahill) Mayfly Dun Pictures

Based on the identical size, shape, and relative proportions of different body parts, I'm pretty sure this dun is of the same species as two spinners I collected at about the same time. The color is dramatically different, but that's to be expected with many of these species in the transition from dun to spinner.

Ruler view of a Male Stenonema ithaca (Heptageniidae) (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.

Lateral view of a Male Stenonema ithaca (Heptageniidae) (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

Dorsal view of a Male Stenonema ithaca (Heptageniidae) (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

Male Stenonema ithaca (Heptageniidae) (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

Ventral view of a Male Stenonema ithaca (Heptageniidae) (Light Cahill) Mayfly Dun from the West Branch of the Delaware River in New York

This mayfly was collected from the West Branch of the Delaware River in New York on June 7th, 2007 and added to Troutnut.com by Troutnut on June 8th, 2007.

Discussions of this Dun

Cahills

12 replies

Posted by Dryfly on Jun 5, 2010

Last reply on Jun 11, 2010 by Wiflyfisher

Do Cahills ever come off in enough numbers for a rise to occur? Around here, they trickle off annoyingly, and never get much trout attention.I am wondering about this, cause I saw some spinners at a DQ last night. Are they ever real important?

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