Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Mount Deborah and Hess Mountains. Two of the greatest peaks of the Alaska Range rise behind the braided, glacial Susitna River. These massive mountains are 35 miles north of where I took this picture.

From the Susitna River in Alaska

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.

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 Genus Oligophlebodes (Little Western Dark Sedges)

Where & when

Time of year : August and September

All Oligophlebodes species of significance to fly fishermen occur in the West.

They also occur, but not in significant numbers, in the Midwest.

In 39 records from GBIF, adults of this genus have been collected during August (44%), July (28%), June (13%), September (8%), and May (8%).

In 13 records from GBIF, this genus has been collected at elevations ranging from 2733 to 11191 ft, with an average (median) of 6250 ft.

Genus Range

source

Map of specific collection sites

Hatching behavior

Time of day : Midday

Egg-Laying behavior

Time of day: Late afternoon

Females of this genus fall to the surface to lay their eggs.

Larva & pupa biology

Shelter type: Stone

The cased larvae exhibit heavy behavioral drift near midday for a couple months before emerging.

Start a Discussion of Oligophlebodes

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.