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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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

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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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Schroon River Stone Fly

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

Cstiles
Posts: 2

Cstiles on Jun 13, 2010June 13th, 2010, 1:28 am EDT

I have seen several of these nymphs over the years but Not sure what they are or what the adult looks like. Any help would be appreciated.

Chris

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Jun 13, 2010June 13th, 2010, 4:33 am EDT

Chris,

Your stonefly nymph looks like Paragnetina media. This is one of the most common large perlids in much of the East and Midwest. The adults are dark-winged with yellowish bellies. They look like this: http://bugguide.net/node/view/404851/bgimage

Cstiles
Posts: 2

Cstiles on Jun 13, 2010June 13th, 2010, 8:56 am EDT

Gonzo,
Thanks for the ID. The Schroon is so loaded with different types of stone flies, It's hard to keep track of all of them. The big goldens (Acroneuria carolinensis) are predominate. I estimate that 80% of the trout bug volume is made up of caddis and stones. Mayflies and ants making up the final 20%.
Thanks again,
Chris