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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.

A small, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

Stream photos

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Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 in Washington
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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.

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

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Baetidae (Blue-Winged Olives)
  6. » Genus Acentrella (Tiny Blue-Winged Olives)
  7. » Species insignificans (Tiny Blue-Winged Olives)
Collection details
Location: Yakima River, Washington
Date: September 12th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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