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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.

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.
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.
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Dixa True Fly Larva Pictures

Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dorsal view of a Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington
Ruler view of a Dixa (Dixidae) True Fly Larva from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.

This true fly was collected from Mystery Creek #249 in Washington on July 25th, 2019 and added to Troutnut.com by Troutnut on July 27th, 2019.

Discussions of this Larva

This appears to be Dixa sp.
1 replies
Posted by Creno on Aug 7, 2019
Last reply on Aug 8, 2019 by Jmd123
I checked with Greg Courtney and this appears to be a Dixa larva.

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Dixa True Fly Larva Pictures

Taxonomy
Collection details
Location: Mystery Creek #249, Washington
Date: July 25th, 2019
Added to site: July 27th, 2019
Author: Troutnut
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