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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.
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Al514 has attached these 2 pictures. The message is below.
Al514
Al514's profile picture
Central New York

Posts: 142
Al514 on Nov 21, 2013November 21st, 2013, 2:46 am EST
JOHNW's post reminded me of a brown I caught last fall that was colored up like no other brown I've caught before.

I love when they get this fired up!
Kschaefer3
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St. Paul, MN

Posts: 376
Kschaefer3 on Nov 21, 2013November 21st, 2013, 5:02 am EST
Beautiful colors on a big brown, does it get better?
Jmd123
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Oscoda, MI

Posts: 2474
Jmd123 on Nov 21, 2013November 21st, 2013, 2:05 pm EST
WOW!!! They sure do get colored up fine for spawning, don't they? Very nice!

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Nov 23, 2013November 23rd, 2013, 6:57 am EST
Possibly the most gorgeous fish photos I've seen. Good work all around.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Al514
Al514's profile picture
Central New York

Posts: 142
Al514 on Nov 24, 2013November 24th, 2013, 2:07 am EST
Thanks guys, appreciate it.
JOHNW
JOHNW's profile picture
Chambersburg, PA

Posts: 452
JOHNW on Nov 28, 2013November 28th, 2013, 4:20 pm EST
Stunning fish and great photo!
"old habits are hard to kill once you have gray in your beard" -Old Red Barn

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