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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

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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This discussion is about the West Branch of the Delaware River.

A tributary on the left approaches the large Catskill river on the right.

From the West Branch of the Delaware River in New York
The West Branch of the Delaware River in New York
The West Branch of the Delaware River (Upper) in New York
The West Branch of the Delaware River in New York
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Jan 25, 2013January 25th, 2013, 7:21 pm EST
I have seen many instances on the middle West Branch (From Upper Game Lands to Hale Eddy Bridge) where there will be zillions of Trico spinner in the air, and later on the water, and not a single rising fish. Yet from Balls Eddy down to where West Branch enters the main stem you will often find fish rising steadily to the spinners in pods remeniscent of the Missouri river pods of the 1990's. I've never seen Tricos above the Hale eddy bridge.
Catskill fly fisher for fifty-five years.
West Chester,PA

Posts: 8
AFISHN on Jul 15, 2015July 15th, 2015, 12:15 pm EDT
The Delaware Main Stem ws my home water(Cochecton,NY).....I have only seen tricos above Hale's Eddy Bridge 2 times in 40 years
"..when i'm not AFISHN,I'm a huntin'... "

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