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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.

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.
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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Troutnut.com User Creno (Dave Ruiter)

Troutnut.com User Creno (Dave Ruiter)


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Real Name
Dave Ruiter
Location
Grants Pass, OR
Biography & Thoughts
Dave Ruiter (username Creno) was one of the all-time most valuable and prolific contributors to the Troutnut.com community, generously sharing his deep knowledge as a professional caddisfly expert and helping me with countless caddisfly identifications. Sadly, he passed away in 2021 at age 73. On Trichoptera.org I found a touching tribute to him and wanted to share it in his profile here. —Jason/Troutnut

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