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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.

Mystery Creek # 199 in Washington

Stream photos

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Hydropsyche (Spotted Sedge) Caddisfly LarvaHydropsyche (Spotted Sedge) Caddisfly Larva
Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
9 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 Streams
    2. ›
  2. Wisconsin
    3. ›
  3. The Namekagon River

  1. Trout Streams
    2. ›
  2. Wisconsin
    3. ›
  3. The Namekagon River

Closeup insects by Troutnut from the Namekagon River in Wisconsin

3
Ephemerella invaria (Sulphur) Mayfly Nymph
Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Nymph from the Namekagon River in Wisconsin
5
Male Baetisca laurentina (Armored Mayfly) Mayfly Dun
Male Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Dun from the Namekagon River in Wisconsin
I found this dun floating on the surface at night while I mucked around in the shallows collecting nymphs. I suspect he may have been prompted to emerge by the stress of my disturbance.
3
Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph
Dorsal view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
4
Female Attenella attenuata (Blue-Winged Olive) Mayfly Dun
Lateral view of a Female Attenella attenuata (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Namekagon River in Wisconsin
This dun was badly damaged in transport and all its legs fell off, but I photographed it anyway because I wasn't sure I would fine more and it's an interesting species. Luckily I collected better specimens a few days later.
3
Gasterosteidae (Stickleback) Fish Adult
Lateral view of a Gasterosteidae (Stickleback) Fish Adult from the Namekagon River in Wisconsin
Brook Stickleback Culea inconstans
3
Gasterosteidae (Stickleback) Fish Adult
Lateral view of a Gasterosteidae (Stickleback) Fish Adult from the Namekagon River in Wisconsin
Brook Stickleback Culea inconstans
4
Cottidae (Sculpin) Fish Adult
Lateral view of a Cottidae (Sculpin) Fish Adult from the Namekagon River in Wisconsin
Mottled Sculpin Cottus bairdi
1
Percidae (Perch, Walleyes, and Darters) Fish Adult
Lateral view of a Percidae (Perch, Walleyes, and Darters) Fish Adult from the Namekagon River in Wisconsin
Johnny Darter (Etheostoma nigrum)
3
Male Caecidotea (Cress Bug) Arthropod Adult
Dorsal view of a Male Caecidotea (Asellidae) (Cress Bug) Arthropod Adult from the Namekagon River in Wisconsin
4
Nigronia serricornis (Fishfly) Hellgrammite Larva
Dorsal view of a Nigronia serricornis (Corydalidae) (Fishfly) Hellgrammite Larva from the Namekagon River in Wisconsin
4
Belostoma flumineum (Electric Light Bug) Giant Water Bug Adult
Lateral view of a Belostoma flumineum (Belostomatidae) (Electric Light Bug) Giant Water Bug Adult from the Namekagon River in Wisconsin
I haven't seen the imitation of these things stressed, but in August 2003 on one of my favorite rivers the largest brown trout I kept had stomachs full of these things.
4
Cordulegaster Dragonfly Nymph
Dorsal view of a Cordulegaster (Cordulegastridae) Dragonfly Nymph from the Namekagon River in Wisconsin
This is a realy big, dark dragonfly nymph. Notice how "fuzzy" it is--it's covered with small hairs that collect sediment and debris and camouflage the nymph to match its natural surroundings. The greenish cast in some of the photos of this specimen is due to strange lighting during my first night photographing things for this site.
2
Gomphidae Dragonfly Nymph
Dorsal view of a Gomphidae Dragonfly Nymph from the Namekagon River in Wisconsin
3
Gomphidae Dragonfly Nymph
Dorsal view of a Gomphidae Dragonfly Nymph from the Namekagon River in Wisconsin
3
Tipulidae (Crane Fly) True Fly Larva
Tipulidae (Crane Fly) True Fly Larva from the Namekagon River in Wisconsin
2
Cambaridae Crayfish Juvenile
Dorsal view of a Cambaridae Crayfish Juvenile from the Namekagon River in Wisconsin
4
Female Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult
Dorsal view of a Female Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin
Several stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.
5
Female Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult
Dorsal view of a Female Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin
Several stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.
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