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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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 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.

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.

River Wharfe

Report at a Glance

General Region	River Wharfe, Yorkshire, England
Specific Location	various
Dates Fished	9/17-23
Time of Day	day and eve
Fish Caught	trout and a grayling
Conditions & Hatches	mostly cloudy, temps in the 50s--yeah, it was cold, but it didn't rain low, clear water sporadic hatches of "pale watery" and "little olive" mayflies (think PMD and BWO--same flies worked.)

Details and Discussion

CaseyP

Arlington, VA/ Mercersburg, PA

Posts: 653

CaseyP on Sep 26, 2009September 26th, 2009, 10:41 am EDT

back to old Blighty for another try at those English fish. one day with the same excellent guide as 7/2007 at Bolton Abbey, one day on my own at Burnsall, and two evenings at a rare, tiny public access point on the river within walking distance of my hosts' house.

while outrageous success was not my lot, i never got skunked and did catch my first grayling. well, actually i caught 5 or six of them, but all but one were tiny grayling of the future. i had assumed they were chub as they shot past my ear because they had that extra-slippery wigglyness to them, but Excellent Guide set me straight.

"You can observe a lot by watching." Yogi Berra

Martinlf