Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 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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Need help identifying!!

Jsawatzky has attached these 3 pictures to aid in identification. The message is below.

Jsawatzky
Posts: 1

Jsawatzky on Jun 26, 2015June 26th, 2015, 5:18 pm EDT

My husband brought back a bottle of gravel from a river in middle Quartz creek in pitkin Colorado, he had added tap water to the gravel while in pitkin. Well I just noticed these 2 little bug/fish like creatures swimming around in the bottle today( it's been a month since we brought the bottle back and it has been sealed) it is hard to get a good clear picture but we really like to get some sort of idea as to what they are

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jun 26, 2015June 26th, 2015, 5:57 pm EDT

As near as I can tell they are mayfly nymphs. They would appear to be either Siphlonurus or Callibaetis species.

http://www.troutnut.com/topic/8794/Siphlonurus-sp

http://www.troutnut.com/topic/8823/Callibaetis-sp

Hope this helps,

Mark

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

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jul 2, 2015July 2nd, 2015, 10:14 pm EDT

Welcome to the forum!

I would go with the former based on the proportions. The length and size of the abdomens together with the crowding of the pronounced gills on the upper segs point to Siphlonurus (Gray Drake). The shorter tails/antennae/legs and wide heads do as well. They look to be fairly immature with some weeks to go before hatching.

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Jul 3, 2015July 3rd, 2015, 6:00 am EDT

Yes, young Siphlonurus. I found my first in a ditch in a hay field a good 2 miles from the nearest stream.

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jul 3, 2015July 3rd, 2015, 9:17 pm EDT

Yeah, isn't that amazing? Fishing the upper Williamson in OR a few years ago I was crossing a flooded grassland at least 1/2 mile from the river. My waders were covered with nymphs... Not one however was recovered from my bug nets planted at the stream margins!

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Creno
Grants Pass, OR

Posts: 302

Creno on Jul 5, 2015July 5th, 2015, 2:16 pm EDT

and they (along with corixids) carry on just fine in open sewage ponds. tough buggers :-)