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 "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night.

From the Firehole River in Wyoming

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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.

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.

Helicopsychidae (Snail Case-Maker Caddisfly)

Witmergreen has attached this picture. The message is below.

Witmergreen
Posts: 1

Witmergreen on Mar 29, 2009March 29th, 2009, 1:27 pm EDT

Hi all,

New to the site. I'm not a fisherman myself, but I do a lot of water quality monitoring and I've been making a concerted effort over the past year to become familiar with the various macroinvertebrates that live in streams, so I'm excited to see the wealth of excellent photos of them here. I have a small collection of some preserved specimens and thought I'd share a photo of one of them here - this is a helicopsycidae, or snail case-maker caddisfly that I found in one of the local streams last summer. Photo was taken using a Digimicro USB digital microscope. For scale, this guy measures about 1/4" across.

Steve

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Mar 29, 2009March 29th, 2009, 2:35 pm EDT

Hi Steve-

Interesting digital microscope, and the price is certainly right. I see it will capture a 1.3 MB image. However the image you posted (picture_281_full) is only 46 KB. Would appreciate your posting another image of your Snail Case Maker Caddisfly, which is just under Jason's 1 MB maximum, so I can more fully appreciate the capability of this scope.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com