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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.

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

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.
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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.
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Photos by Troutnut and /home/jason from the Big Hole River and the Henry's Fork of the Snake River in Montana and Idaho

The Big Hole River in Montana
The Big Hole River in Montana
Lower end of the storried Harriman Ranch section of the Henry's From the Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Henry's Fork of the Snake River in Idaho
The Big Hole River in Montana
The Big Hole River in Montana
The Big Hole River in Montana
The Big Hole River in Montana
My first Mountain Whitefish. From the Big Hole River in Montana
The Big Hole River in Montana
The Big Hole River in Montana

Closeup insects by Troutnut from the Firehole River, the Henry's Fork of the Snake River, and the Big Hole River in Wyoming, Idaho, and Montana

6
Male Callibaetis (Speckled Dun) Mayfly Spinner
Lateral view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Firehole River in Wyoming
5
Tipulidae (Crane Fly) True Fly Adult
Artistic view of a Tipulidae (Crane Fly) True Fly Adult from the Henry's Fork of the Snake River in Idaho
4
Female Callibaetis (Speckled Dun) Mayfly Spinner
Lateral view of a Female Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
8
Female Grammotaulius lorettae (Northern Caddisfly) Caddisfly Adult
Lateral view of a Female Grammotaulius lorettae (Limnephilidae) (Northern Caddisfly) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
3
Libellulidae Dragonfly Adult
Dorsal view of a Libellulidae Dragonfly Adult from the Henry's Fork of the Snake River in Idaho
This specimen of Libella saturata, the flame skimmer dragonfly, is the only invertebrate in this site's collection that I caught by hook and line. It swooped down and attacked my dry fly on the Firehole River, where it lived as a nymph in the hot water near the geothermal springs and geyser runoff.
5
Male Hydropsyche (Spotted Sedge) Caddisfly Adult
Lateral view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
This was identified by Dave Ruiter as Hydropsyche californica or Hydropsyche occidentalis, but the characteristics were not clear enough to tell them apart.
5
Female Tricorythodes (Trico) Mayfly Spinner
Lateral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Big Hole River in Montana
7
Male Paraleptophlebia (Blue Quill) Mayfly Dun
Lateral view of a Male Paraleptophlebia (Leptophlebiidae) (Blue Quill) Mayfly Dun from the Big Hole River in Montana
4
Male Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun
Lateral view of a Male Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun from the Henry's Fork of the Snake River in Idaho
3
Male Tricorythodes (Trico) Mayfly Spinner
Lateral view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
4
Amiocentrus aspilus (Little Western Weedy Water Sedge) Caddisfly Adult
Lateral view of a Amiocentrus aspilus (Brachycentridae) (Little Western Weedy Water Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
5
Male Limnephilus externus (Summer Flier Sedge) Caddisfly Adult
Lateral view of a Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
4
Male Lepidostoma (Little Brown Sedge) Caddisfly Adult
Lateral view of a Male Lepidostoma (Lepidostomatidae) (Little Brown Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
4
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun
Lateral view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun from the Henry's Fork of the Snake River in Idaho
3
Male Tricorythodes (Trico) Mayfly Spinner
Dorsal view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Big Hole River in Montana

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