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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.

The Clark's Fork of the Yellowstone River in Wyoming

Stream photos

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Sweltsa (Sallfly) Stonefly NymphSweltsa (Sallfly) Stonefly Nymph
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
10 Recently Added Photos
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.

  1. Trout and Salmon Streams
    2. ›
  2. Washington
    3. ›
  3. The Dosewallips River

  1. Trout and Salmon Streams
    2. ›
  2. Washington
    3. ›
  3. The Dosewallips River

Closeup insects by Troutnut from the Dosewallips River in Washington

13
Brachycentrus americanus (American Grannom) Caddisfly Larva
Case view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Dosewallips River in Washington
Both the genus ID (Merritt & Cummins) and species ID (Flint 1984) are pretty confident for this larva, a nice example of a common western caddisfly. It was by far the most abundant insect in my kicknet sample on this trip, and many of the rocks in the fast riffle where I sampled had dozens of these larvae clinging on.
9
Drunella grandis (Western Green Drake) Mayfly Nymph
Lateral view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
8
Male Baetis flavistriga (BWO) Mayfly Nymph
Dorsal view of a Male Baetis flavistriga (Baetidae) (BWO) Mayfly Nymph from the Dosewallips River in Washington
This nymph keys to Baetis assuming the villipore is present (hard to see in my photos or scope), and within that genus it tentatively keys to the flavistriga species complex, of which Baetis flavistriga itself is by far the most common in Washington state, so that's the most likely ID.
6
Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph
Dorsal view of a Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Dosewallips River in Washington
8
Neoleptophlebia memorialis Mayfly Nymph
Artistic view of a Neoleptophlebia memorialis (Leptophlebiidae) Mayfly Nymph from the Dosewallips River in Washington
This specimen keys to the Neoleptophlebia memorialis group, which means it could be Neoleptophlebia memorialis or Neoleptophlebia temporalis. In the absence of a clear species key, I'm just guessing memorialis for now.
4
Epeorus longimanus (Slate Brown Dun) Mayfly Nymph
Dorsal view of a Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from the Dosewallips River in Washington
7
Cinygmula (Dark Red Quill) Mayfly Nymph
Dorsal view of a Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Nymph from the Dosewallips River in Washington
Unfortunately there's no good key to species of Cinygmula nymphs and I didn't find an adult, so this one will have to stay at genus level.
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