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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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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.

Freshwater Invertebrate Underwater Pictures, Page 3

Freshwater Invertebrate Underwater Pictures, Page 3

Underwater photos of freshwater invertebrates in their natural habitat.

Mongaup Creek in New York
The West Branch of the Delaware River in New York
Eighteenmile Creek in Wisconsin
A wide variety of caddis larvae and other insects have clustered together on the backside of this rock in fast water.

From Cayuta Creek in New York
This underwater log hosts hundreds of caddisfly larvae, some in cases and some in spiderweb-like lairs.

From the South Fork of the White River in Wisconsin
A large crayfish lurks under a log which is home to several mayfly nymphs and caddisfly larvae.
A large Ephemerella subvaria nymphs clings to a log along with a couple smaller mayfly nymphs.
A couple Sulphur (Ephemerella invaria) nymphs cling to a log.
A big crayfish lurks under a log.
This log houses several Ephemerella mayfly nymphs and, on the top right, an Epeorus mayfly nymph.
There are several species of caddisfly larvae and Ephemerella nymphs on this rock.
An Ephemerella subvaria nymph clings to a white rock in the foreground, and there are other nymphs in the background.
A water boatman and a scud are visible in this picture.  Can you find them?
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