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.

This is one of the many shallow, unnamed lakes in the Arctic coastal plain near the Dalton Highway.

From Dalton Highway in Alaska

Stream photos

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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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 Frenesia (Dot Wing Winter Sedges)

Where & when

Time of year : Late September through February, peaking in November or December

In 73 records from GBIF, adults of this genus have mostly been collected during October (30%), November (21%), September (14%), August (10%), July (8%), June (7%), and May (5%).

In 4 records from GBIF, this genus has been collected at elevations of 164, 299, 1100, and 3609 ft.

Genus Range

source

Map of specific collection sites

Hatching behavior

Time of day : Late morning or afternoon

Pupae emerge from the shallows on warm days, and are the most important stage of this species. They can be very important because few other insects are around at the same time of year.