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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.

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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Jmd123 has attached these 5 pictures. The message is below.
Almost lost this guy in the logs
Second biggest of the night
Can't have a post without wildflowers!  Beardtongue (Penstemon digitalis)
Ninebark (Physocarpus opulifolius) just starting to bloom
Forget-me-not (Myosotis sp.)
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Jun 13, 2016June 13th, 2016, 9:02 pm EDT
Well, after last week's disasters, I had to get back in the saddle. With a brand new set of waders and boots, courtesy Nordic Sports in Tawas (got to try them on, something you can't do online), I headed back to the Rifle where my previous water pants blew out on me. No really major hatches, but quite a variety of insects on the water, some caddis flies flitting about and some mayflies riding the current. Well, it was enough to get them feeding, and I think I caught about 20, having lost count somewhere after 6...first on a #12 grey EHC, then switched to my last Iso imitation and started to REALLY hammer them, including a 15-incher who went into some wood and wrapped, then came flying back out when I went in to untangle him, still on the fly! Got a few little rainbows including a 9 1/2-incher that went airborne several times. When I lost that fly - I have the pattern memorized so I just need to tie 'em - I put on a #12 Adams and continued to catch fish...

Best night on the Rifle this year - beautiful evening, beautiful water, beautiful flowers, abundant bugs, hungry fish, and all to myself! Life IS good!

No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Steps25's profile picture

Posts: 31
Steps25 on Jun 15, 2016June 15th, 2016, 9:54 am EDT

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