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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

7 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 Psychomyia flavida (Dinky Purple Breasted Sedges)

These small caddisflies are noteworthy because they are widespread and can be extremely abundant, and they are capable of parthenogenesis.

Where & when

Time of year : June through August

Preferred waters: Most abundant in large-river rapids

This species is most abundant in the East and Midwest, but Gary LaFontaine discovered that there are also good populations in Montana. He mentions in Caddisflies that this can be the most abundant species of caddisfly on many rivers.

In 129 records from GBIF, adults of this species have mostly been collected during June (23%), July (22%), August (17%), May (15%), September (7%), and April (5%).

In 90 records from GBIF, this species has been collected at elevations ranging from 20 to 8924 ft, with an average (median) of 3252 ft.