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 spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 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 April 22, 2007

Closeup insects by Troutnut from Fall Creek and Mystery Creek #62 in New York

Male Ephemerella subvaria (Hendrickson) Mayfly Spinner

11 Pictures

An Ephemerella mayfly. This mayfly is an adult mayfly of the imago or "spinner" stage

Lateral view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Spinner from Fall Creek in New York

I collected this beautiful male Hendrickson specimen as a dun, along with a female Hendrickson from the same hatch. Both molted into spinners in my house within a couple of days.

Collected April 22, 2007 from Fall Creek in New York

Added by Troutnut on April 25, 2007

Collected April 22, 2007 from Fall Creek in New York and added by Troutnut on April 25, 2007

Chironomidae (Midge) True Fly Adult

7 Pictures

One of the only real benefits I've got from my rearing aquarium so far is that I've had quite a variety of midges emerge, giving me a chance to photograph these fragile little insects which are otherwise really hard to transport in photogenic form. This one recovered from being gassed and flew away before I could photograph it on the ruler, but it was very small, around 1.5mm.

Collected April 22, 2007 from Mystery Creek #62 in New York

Added by Troutnut on April 25, 2007

Collected April 22, 2007 from Mystery Creek #62 in New York and added by Troutnut on April 25, 2007

Female Ephemerella subvaria (Hendrickson) Mayfly Spinner

5 Pictures

Lateral view of a Female Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Spinner from Fall Creek in New York

This female Hendrickson spinner is in kind of bad shape, but at least now I've got some good closeup photos of one. I collected her and a male Hendrickson as duns from the same hatch, and both molted into spinners in my house within a couple of days.

Collected April 22, 2007 from Fall Creek in New York

Added by Troutnut on April 25, 2007

Collected April 22, 2007 from Fall Creek in New York and added by Troutnut on April 25, 2007