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.

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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.

Seaweed in fish's diet?

Shawnny3
Moderator
Pleasant Gap, PA

Posts: 1197

Shawnny3 on Jun 24, 2013June 24th, 2013, 10:53 am EDT

My brother and I kept a few fish for dinner the other night and examined the stomach contents. There were a few insects and shrimp, but what I was most intrigued by was that about 95% of what was in their stomachs was seaweed. We were wondering if the fish consume this because they know it contains crustaceans and insects, or if the seaweed is consumed unintentionally as they consume bugs, or if they actually gain some nutrition from the seaweed. Thoughts?

-Shawn

Jewelry-Quality Artistic Salmon Flies, by Shawn Davis
www.davisflydesigns.com

Kschaefer3

St. Paul, MN

Posts: 376

Kschaefer3 on Jun 24, 2013June 24th, 2013, 11:06 am EDT

I would be inclined to think they eat seaweed as a by product of eating insects and crustaceans, or because they know insects and crustaceans reside in them. This is a very interesting question though. Anyone have a good seaweed fly?

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Jun 26, 2013June 26th, 2013, 4:03 pm EDT

Dunno. I've seen it too -filamentous algae I believe, but not to that degree. Any idea what the plants were?

Shawnny3
Moderator
Pleasant Gap, PA

Posts: 1197

Shawnny3 on Jun 26, 2013June 26th, 2013, 6:22 pm EDT

Not a clue. Probably the same stuff we kept picking off our flies. Maybe we should have left it on there. Then again, would that be considered bait fishing?

-Shawn

Jewelry-Quality Artistic Salmon Flies, by Shawn Davis
www.davisflydesigns.com

Gutcutter

Pennsylvania

Posts: 470

Gutcutter on Jun 27, 2013June 27th, 2013, 4:06 pm EDT

Maybe they're a vegan subspecies?

All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Jun 28, 2013June 28th, 2013, 1:52 pm EDT