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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 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 RegionSouth Central PA
Specific LocationSouth Central PA
Dates FishedApril 23 and 24
Time of Day9 am -5 pm; 11-4
Fish CaughtProbably 50 fish hooked, about 40 trout landed, one rainbow, all the rest browns, up to 18."
Conditions & HatchesTuesday bright and sunny; Wednesday mostly cloudy.

Details and Discussion

Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Apr 25, 2013April 25th, 2013, 7:02 am EDT
My arm was on the mend, the grannoms were on, and the fish were taking them in one of the streams that Spence fished. Tuesday was a numbers day, with fish taking flies everywhere: emergers in the flats and pools, egg layers in the riffles later in the day. Wednesday, with the cloud cover, the big fish came out to play. Did not hook as many, but the percentage was for larger fish, including a 20+ brown that jumped twice and threw the fly on the second jump. It took in an eddy on my side of the stream, then pealed across heavy current in front of a mostly submerged rock, zinging line off my reel. I thought for sure the line would hang on the rock but it popped free and into the air as I held the rod high. Just then the fish made its first jump on the other side of the river. Then the pulsing in the deep water among the rocks started. A number of fish large and small had popped the barbless hooks out on the slabs and shelves, and I thought this would happen here, but it was just after I had steered the tiring fish into my eddy when it made one last jump and shook out the hook. Oh well, a more than worthy opponent won his freedom and humbled me with his beauty and power. Most fish took a dry cdc fly, but some that refused this fly took a tent wing parachute. More on this and some entomology questions in another post.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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