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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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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.

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15 these mayflies closed a bridge in Pennsylvania - What are they?

KennyBruin has attached this picture to aid in identification. The message is below.

News reports said there were piles of these mayflies two feet deep in Wrightsville, PA.

KennyBruin

Posts: 3

KennyBruin on Jun 17, 2015June 17th, 2015, 7:14 pm EDT

I am not much at identifying bugs. I read about a humungous hatch of these mayflies that closed a bridge over the Susquehana River in South Central PA. (at this point the river is smallmouth water, not trout water) Can anyone identify them for me? Thanks in advance.

Jmd123

Oscoda, MI

Posts: 2474

Jmd123 on Jun 17, 2015June 17th, 2015, 7:40 pm EDT

Kenny, see the thread entitled, "Epic Mayfly emergence" for the opinions of the gang on here. BTW, smallies take these just like trout do!! On Cooke Pond here on the Au Sable River system, I am told that even walleye will rise to a dry during this hatch!

Jonathon

No matter how big the one you just caught is, there's always a bigger one out there somewhere...

KennyBruin

Posts: 3

KennyBruin on Jun 17, 2015June 17th, 2015, 7:48 pm EDT

Sorry for the double posting and thanks for pointing me to the "Epic Mayfly" thread.