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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
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.

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.
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Female Epeorus deceptivus Mayfly Dun Pictures

I'm guessing this female is of the same species as this male dun, because they came from the same pool at the same time and the size matches, although the males and females would look very different in this case.

Lateral view of a Female Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington
Ventral view of a Female Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington
Dorsal view of a Female Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington
Tick marks are 1/16"

Ruler view of a Female Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington The smallest ruler marks are 1/16".
Female Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington

This mayfly was collected from the South Fork Sauk River in Washington on July 5th, 2017 and added to Troutnut.com by Troutnut on July 6th, 2017.


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Female Epeorus deceptivus Mayfly Dun Pictures

Collection details
Location: South Fork Sauk River, Washington
Date: July 5th, 2017
Added to site: July 6th, 2017
Author: Troutnut
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