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.

Stream photos

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Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington

I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing 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.

?s on larvae IDs

Limnephilidae (Giant Sedges) Caddisfly Larva

5 Pictures

Collected February 29, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected February 29, 2004 from unknown in Wisconsin and added by Troutnut on January 25, 2006

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Oct 14, 2006October 14th, 2006, 8:34 am EDT

Jason-

I just can't convince myself that either of the larvae pictured in this section are Brachycentridae. The cases don't conform to any I know (usually tapered four-sided "log cabin" cases for most Brachycentrus or smaller tapered round cases for Micrasema and Amiocentrus).

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Oct 14, 2006October 14th, 2006, 9:44 am EDT

You're probably right. These larvae were from the old site and I mostly had identifications based on various helpful emails I've since lost track of. So I don't remember what the rationale was.

That's why the new site has this comment system on the specimens: to keep a public record of the identification talk.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 22, 2008May 22nd, 2008, 11:01 am EDT

This is another specimen that has bothered me for some time. The fourth picture in the sequence seems to show a dorsal hump. I'm guessing that this is another limnephilid. Creno, help me out here!

Creno
Grants Pass, OR

Posts: 302

Creno on May 22, 2008May 22nd, 2008, 1:25 pm EDT

Gonzo - Sorry I cannot help much other than agree with you it is not a brachycentrid. Looks like a limnephilid to me. I can't get a good enough view of gills or legs to get any closer.

dave

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 22, 2008May 22nd, 2008, 2:14 pm EDT

Fair enough. Thanks, Dave.