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

Stream photos

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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

10 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.

Brachycentrus

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on May 7, 2014May 7th, 2014, 5:46 pm EDT

Found a couple of caddisflies on a rock.

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on May 7, 2014May 7th, 2014, 6:28 pm EDT

I have never seen that many so well packed in.

That's what grannoms do. Maybe Creno can tell us why. I managed to grab 10 or 15 at once and the ones that didn't get away were all females but I don't know if that was just random. I did notice some crawling down the rock and then underwater. I'm assuming to lay eggs?

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on May 8, 2014May 8th, 2014, 2:37 am EDT

Did this just happen ???

The Brachycentrus sp. emergences here (South Central PA) start in the beginning of April.

Oldredbarn

Novi, MI

Posts: 2600

Oldredbarn on May 8, 2014May 8th, 2014, 7:57 pm EDT

Nice Eric...With us being behind you a bit weather wise, what do you think I'm tying up? :)

Spence

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood

Creno
Grants Pass, OR

Posts: 302

Creno on May 9, 2014May 9th, 2014, 9:24 am EDT

Sorry - I have never seen that and cannot find any literature that addresses it. Some Brachycentrus are known to pupate in masses, and males of some species often have very brief emergence periods, even a day or two. But that doesn't really explain why all the males would get together in a mass. They should be out wandering the neighborhood. Many caddis use pheromones to get the adults together. But if that mass was all females that wouldn't make much sense either. I am at a loss but great pics. May I use them to show other caddis folks? Maybe some one else has an idea what is going on.

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on May 10, 2014May 10th, 2014, 9:39 am EDT