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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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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Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Dun Pictures

This specimen emerged indoors from nymphs I had collected, then partly molted into a spinner but got stuck along the way. I've included a couple pictures showing some of the spinner colors. It got a bit waterlogged after emerging, so the wings aren't in perfect shape, but it still represents one of two Baetids that were emerging and drawing trout to rise on the Yakima. Based on body size and shape, it is most likely the same species as this nymph.

Lateral view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Dorsal view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Ventral view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Ruler view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington The smallest ruler marks are 1 mm.
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Dun from the Yakima River in Washington

This mayfly was collected from the Yakima River in Washington on September 12th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.


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Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Dun Pictures

Collection details
Location: Yakima River, Washington
Date: September 12th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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