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

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.

Dorsal view of a Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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.

Feature Articles

Feature Articles

Marjan Fratnik and the History of the F-fly

Guest author Toma┼ż Modic shares this piece about the history of the "F-fly," a simple but extremely effective fly pattern little known in the states but very popular in its country of origin, Slovenia, and elsewhere in Europe.

Uncle Joe - The "Original Troutnut"

Some recently uncovered stories show why my Great Uncle Joe was the "Original Troutnut," among other adventurous titles.

An Isonychia Nymph Emerging

As I prepared to set foot for the first time in the Catskills' storied Esopus Creek, I noticed an Isonychia bicolor nymph crawling out onto a rock at my feet. I pulled out my handy little camera and started snapping pictures.

Mayfly Dun to Spinner Illustrated

When mayfly duns pop out of the water and fly away, they aren't yet officially "adults." They have one more step before they're ready to mate: to perch on streamside vegetation and molt one more time into the stage scientists call "imago" and we call "spinner." This article shows step-by-step close-up photos of a Leptophlebia cupida (Black Quill) dun molting into a spinner, and it explains what's going on inside the mayfly.


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