Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

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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.

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Nymph??

Btbo32 has attached this picture to aid in identification. The message is below.

Btbo32
Posts: 13

Btbo32 on Oct 27, 2017October 27th, 2017, 7:48 am EDT

Would anyone happen to know what kind of nymph these could be?

Jersey Boy

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Oct 27, 2017October 27th, 2017, 11:26 am EDT

My guess and it's only a guess would be Maccaffertium. When were they collected, what size were they and where were they collected?

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Btbo32
Posts: 13

Btbo32 on Oct 27, 2017October 27th, 2017, 2:02 pm EDT

I collected these today on the Big Flatbrook in Sussex County Nj. I would say going by hook size probably 12-14. Not sure what a Maccaffertium is..sorry new at learning all these aquatic insects. Please advise if you could? Thanks for reaching out!

Jersey Boy

Btbo32
Posts: 13

Btbo32 on Oct 27, 2017October 27th, 2017, 2:42 pm EDT

I think you were correct ( Cream Cahill nymph)
Thank you!

Jersey Boy

Btbo32
Posts: 13

Btbo32 on Oct 27, 2017October 27th, 2017, 2:58 pm EDT

Anyone have an idea of a good imitation fly pattern this nymph?

Jersey Boy

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Oct 27, 2017October 27th, 2017, 2:59 pm EDT

Maccaffertium is the name of a heptageniidae (flat-headed) mayfly nymph and adult. The reason I guessed Maccaffertium is because the front leg is fairly wide at the femur and looks to be banded with brown and a whitish color and because it has the general body configuration of a flat-headed nymph. I'm going on guess work as much as anything.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Wbranch

York & Starlight PA

Posts: 2635

Wbranch on Oct 29, 2017October 29th, 2017, 3:36 am EDT

Maccaffertium

I thought this was the nymph of the March Brown. BTW Big Flatbrook was my "home" trout stream for about 25 years until I bought a cabin on the Delaware River.

Catskill fly fisher for fifty-five years.

Btbo32
Posts: 13

Btbo32 on Nov 4, 2017November 4th, 2017, 12:01 pm EDT

March Brown? Wow great! Thanks.

Jersey Boy