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.

I spent more than an hour casting to several rising trout in this pool and caught only two. Its clear water and tricky currents harbor dozens of free-rising, usually very hard-to-catch fish.

From Enfield Creek in New York

Stream photos

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Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington

This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.

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.

Caddisfly Species Rhyacophila vocala (Green Sedges)

This is a common mountain caddisfly.

Where & when

Time of year : Early to mid-Summer

In 9 records from GBIF, adults of this species have been collected during July (33%), June (22%), April (22%), May (11%), and August (11%).

In 5 records from GBIF, this species has been collected at elevations ranging from 1700 to 4721 ft, with an average (median) of 3750 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

Substrate: Boulders

Environmental tolerance: Prefers cold water

Specimens of the Caddisfly Species Rhyacophila vocala

1 Larva

Rhyacophila vocala (Green Sedge) Caddisfly Larva

11 Pictures

Lateral view of a Rhyacophila vocala (Rhyacophilidae) (Green Sedge) Caddisfly Larva from Mystery Creek #249 in Washington

This specimen is very tentatively placed in Rhyacophila vocala, but see the caveats given by Dave Ruiter in its identification: "There are two species (hyalinata and vocala) currently within the group and this looks closest to R. vocala. It is likely, however, there are several undescribed species in the group and this is one of those."

Collected July 24, 2019 from Mystery Creek #249 in Washington

Added by Troutnut on July 26, 2019

Collected July 24, 2019 from Mystery Creek #249 in Washington and added by Troutnut on July 26, 2019

Start a Discussion of Rhyacophila vocala

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.