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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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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.

BigTrout
BigTrout's profile picture
Posts: 18
BigTrout on Apr 12, 2012April 12th, 2012, 5:52 pm EDT
I've been thinking alot lately on trout, where they came from and where their native lands were/are...

I am from Utah and the waters I fish can be pretty diverse somtimes, depending on the creek or lake. The trout range from German Brown, Bonneville cutthroat, colorado river cutthroat and Brooke Trout and of course the Rainbow trout. I'm curious to know where these trout originated from. Any advice would be appreciated. Thanks!
The great charm about fly fishing is that we are always learning; no matter how long we have been at it, we are constantly making some new wrinkle. - Theodore Gordon
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Apr 12, 2012April 12th, 2012, 6:24 pm EDT
Hi Bigtrout,

Schwiebert's opus "Trout" is very informative on this issue and nobody does it better in terms of story telling.

The best books for anglers on the subject by far are "About Trout" and "Trout & Salmon of North America", both by Dr. Robert Behnke, who is one of the world's leading authorities on salmonids.

Here's a podcast you might find interesting. Just click on the link and it will take you there. He's a true scholar & gentleman and our fisheries would be a whole lot better off if we only listened and followed his advice.
http://midcurrent.com/podcasts/dr-robert-behnke-a-life-with-trout/
"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

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