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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Report at a Glance

General RegionDeckers
Specific LocationJust below the Wig - Wam Club
Dates Fished9/14/06
Time of Day4:30p - 6:30p
Fish Caught13" Rainbow
Conditions & HatchesThe flow below Cheesman was at 305cfs, and clarity was decent. Midges were coming off and the caddis were doing their normal riffle dance. The midges were tiny I saw some that had to be in the #28 range, the caddis were in the #18 - #20 range.

Details and Discussion

Littleton, Colorado

Posts: 35
Sundula on Sep 14, 2006September 14th, 2006, 4:17 pm EDT
I started with a #18 Pheasent tail and #22 Mecury RS2, nothing. I moved on to a brown Elk hair caddis size #16 (smallest I had) and danced it in the riffles, nothing. Same fly but with a dead drift, finally some action! Several refusals I watched two follow it for awhile until the drag set in. That's when I noticed the midges starring to show up, so I tied on a #24 griffith's gnat below my caddis made a cast at one of the one's who refused the caddis, because he was in a good feeding rhythm. On the second cast he shot up and took the gnat. He fought well and I landed him, it was only 13" but it had beutiful color. I probably should have fished a Black Beauty earlier instead of the RS2 and the pheasent tail, but that is my favorite prospecting rig. I seined for about 15 min and only caught empty caddis larva shucks, moss, gravel and one small green midge larva. So really not much was going on, at least were I was. I don't feel to bad though because that strech above Horse Creek has been pounded since the flood on 7/7, so I was pretty happy to land the one. I will be going out on 9/16 I'm not sure where yet, but there will be another report from Sundula coming soon (and hopefully a nice big fish pic :)) I'm thinking Eleven Mile.

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