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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.

Inlet of Upper Titcomb Lake

From Titcomb Basin in Wyoming

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

7 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.

Updates from January 30, 2004

Updates from January 30, 2004

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Videos by Troutnut from and Miscellaneous Wisconsin in and Wisconsin

Swimming Baetisca Mayfly Nymph

The clumsy-looking mayfly nymphs of the genus Baetisca are surprisingly good swimmers.

Featuring: Baetisca Mayfly Nymph

Shot on Jan 30, 2004

Added by Troutnut on Mar 30, 2006

Water Boatman Rowing

Water boatmen are excellent swimmers, and you can see here how they use their oars to push themselves through the water, a motion easily imitated by the fly fisher.

Featuring: Corixidae True Bug Adult

Shot on Jan 30, 2004 from unknown in Wisconsin

Added by Troutnut on Mar 30, 2006

Damselfly Nymph on the Prowl

Damselfly nymphs are among the most effective invertebrate predators in freshwater. You have to see one in motion to get a feel for their slow, deliberate style of stalking.

Featuring: Calopteryx Damselfly Nymph

Shot on Jan 30, 2004

Added by Troutnut on Mar 30, 2006

Closeup insects by Troutnut from Miscellaneous Wisconsin and the Namekagon River in Wisconsin

3
Caecidotea (Cress Bug) Arthropod Adult

Dorsal view of a Caecidotea (Asellidae) (Cress Bug) Arthropod Adult from unknown in Wisconsin

3
Gomphidae Dragonfly Nymph

Dorsal view of a Gomphidae Dragonfly Nymph from unknown in Wisconsin

4
Amphipoda (Scud) Arthropod Adult

Lateral view of a Amphipoda (Scud) Arthropod Adult from unknown in Wisconsin

4
Cambaridae Crayfish Adult

Dorsal view of a Cambaridae Crayfish Adult from unknown in Wisconsin

2
Tipulidae (Crane Fly) True Fly Larva

Dorsal view of a Tipulidae (Crane Fly) True Fly Larva from unknown in Wisconsin

3
Corixidae (Water Boatman) True Bug Adult

Lateral view of a Corixidae (Water Boatman) True Bug Adult from unknown in Wisconsin

3
Coleoptera (Beetle) Insect Adult

Dorsal view of a Coleoptera (Beetle) Insect Adult from unknown in Wisconsin

You wouldn't know to look at it, but this is an aquatic beetle and it's in water in the photographs.

4
Calopteryx Damselfly Nymph

Dorsal view of a Calopteryx (Calopterygidae) Damselfly Nymph from unknown in Wisconsin

2
Corixidae (Water Boatman) True Bug Adult

Lateral view of a Corixidae (Water Boatman) True Bug Adult from unknown in Wisconsin

3
Platycentropus (Chocolate and Cream Sedge) Caddisfly Larva

Platycentropus (Limnephilidae) (Chocolate and Cream Sedge) Caddisfly Larva from unknown in Wisconsin

2
Limnephilus (Summer Flier Sedge) Caddisfly Larva

Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from unknown in Wisconsin

3
Siphloplecton basale (Pseudo-Gray Drake) Mayfly Nymph

Siphloplecton basale (Metretopodidae) (Pseudo-Gray Drake) Mayfly Nymph from the Namekagon River in Wisconsin

This one's stunned or freshly dead in the pictures, because the water in my photographing tank was a bit too warm for him after being under the bright light for a while.

3
Ephemerella subvaria (Hendrickson) Mayfly Nymph

Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Nymph from unknown in Wisconsin

4
Ephemerella invaria (Sulphur) Mayfly Nymph

Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Nymph from unknown in Wisconsin

6
Ephemera simulans (Brown Drake) Mayfly Nymph

Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Nymph from the Namekagon River in Wisconsin

6
Ephemera simulans (Brown Drake) Mayfly Nymph

Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Nymph from the Namekagon River in Wisconsin

5
Ephemera simulans (Brown Drake) Mayfly Nymph

Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Nymph from the Namekagon River in Wisconsin

10
Ephemera simulans (Brown Drake) Mayfly Nymph

Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Nymph from the Namekagon River in Wisconsin

10
Ephemera simulans (Brown Drake) Mayfly Nymph

Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Nymph from the Namekagon River in Wisconsin

1
Cyprinidae (Minnow) Fish Adult

Lateral view of a Cyprinidae (Minnow) Fish Adult from unknown in Wisconsin

Common Shiner Luxilus cornutus

3
Cyprinidae (Minnow) Fish Adult

Lateral view of a Cyprinidae (Minnow) Fish Adult from unknown in Wisconsin

Sand Shiner Notripis stramineus

3
Amphipoda (Scud) Arthropod Adult

Lateral view of a Amphipoda (Scud) Arthropod Adult from unknown in Wisconsin

3
Chironomidae (Midge) True Fly Larva

Lateral view of a Chironomidae (Midge) True Fly Larva from unknown in Wisconsin

3
Chironomidae (Midge) True Fly Larva

Lateral view of a Chironomidae (Midge) True Fly Larva from unknown in Wisconsin

1
Chironomidae (Midge) True Fly Larva

Lateral view of a Chironomidae (Midge) True Fly Larva from unknown in Wisconsin

2
Clitelatta-Oligochaeta (Worm) Animal Adult

Clitelatta-Oligochaeta (Worm) Animal Adult from unknown in Wisconsin

What a strange worm... half red, half black.

2
Limnephilidae (Giant Sedges) Caddisfly Larva

Limnephilidae (Giant Sedges) Caddisfly Larva from unknown in Wisconsin

5
Eurylophella (Chocolate Dun) Mayfly Nymph

Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Nymph from unknown in Wisconsin

3
Ephemerella invaria (Sulphur) Mayfly Nymph

Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Nymph from unknown in Wisconsin

4
Eurylophella (Chocolate Dun) Mayfly Nymph

Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Nymph from unknown in Wisconsin

Close examination under a microscope easily showed abdominal tubercles.

2
Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph

Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph from unknown in Wisconsin

Close examination of this specimen under a microscope reveals that it has small rounded tubercles on the tergites and the tails are uniformly covered with short black hairs. Looking at this specimen a while later, my early observations were probably not relevant because it was such as small early instar mayfly that its identifying characteristics were not fully developed.

3
Caenis (Angler's Curse) Mayfly Nymph

Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from unknown in Wisconsin

This interesting little Caenis nymph is way darker than any of the others I collected in January 2004, probably a different species. It also has shorter tails.

3
Caenis (Angler's Curse) Mayfly Nymph

Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from unknown in Wisconsin

I confirmed the identity of this nymph by looking at it under a microscope to be certain of the shape of its gills and head.

2
Caenis (Angler's Curse) Mayfly Nymph

Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from unknown in Wisconsin

I confirmed the identity of this nymph by looking at it under a microscope to be certain of the shape of its gills and head.

4
Caenis (Angler's Curse) Mayfly Nymph

Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from unknown in Wisconsin

I confirmed the identity of this nymph by looking at it under a microscope to be certain of the shape of its gills and head.

2
Caenis (Angler's Curse) Mayfly Nymph

Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from unknown in Wisconsin

I confirmed the identity of this nymph by looking at it under a microscope to be certain of the shape of its gills and head.

2
Baetidae (Blue-Winged Olive) Mayfly Nymph

Baetidae (Blue-Winged Olive) Mayfly Nymph from unknown in Wisconsin

Here's a rather different tiny Baetid nymph. The tails are all unbanded, and the tergites all have a dark-colored anterior 2/3 and light-colored posterior 1/3. The gill veinlets are indistinct. It's probably a very early instar of some Baetis species.

3
Baetidae (Blue-Winged Olive) Mayfly Nymph

Baetidae (Blue-Winged Olive) Mayfly Nymph from unknown in Wisconsin

This is the only Baetis nymph I found in my January 31st (read: not sane) sampling in 2004. I looked at this one under my small microscope and wrote down some useful identification features which aren't really visible in the pictures from my camera. This nymph had conspicuous gill veinlets, a pointed, slender 7th gill, tail bands on the middle and tip, and abdominal segments 5, 9, and 10 are definitely pale, with segment 8 in-between, debatably pale.

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