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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.
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.

Lateral view of a Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
I captured this specimen in the same color as this photograph, during its egg-laying flight. The emergers are much lighter.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on May 7, 2009May 7th, 2009, 3:43 am EDT
I happened to be in the right place at the right time for my first Apple Caddis emergence a week or so ago, and caught fish on a Tulpehocken Creek Outfitter's emerger pattern that I tied years ago, but have never used before. It's something like a CDC mayfly emerger, tied on a scud hook, with a puff of CDC at the head to float the body, which remain subsurface. I also had tied in a few long Wood Duck barbules at the throat for legs. This experience led me to wonder if a similar fly might work for selective fish when dark Grannoms emerge. All day long during the Grannom hatch, I typically fish the CDC adult pattern that I posted a while back, and do OK, but last week the fish I was fishing over would have nothing to do with an Apple Caddis CDC adult during the emergence--though they took it during egg laying on flat water in the evening. Do the Grannoms and Apple Caddis have similar emergence behavior? I realize that a number of variables may have been at play. The fish I was fising over during the Apple Caddis emergence are notoriously picky, and they were feeding in a shallow riffle. The fish I target for dark Grannoms are in a different river and they are generally less picky, and see fewer flies. Also, I haven't fished over them for dark Grannoms in the same water type, usually fishing this hatch in deeper riffles and runs--and I may not have hit a concentrated emergence yet. Finally, does anyone know a good wet fly for the Apple Caddis? I'm assuming the pupa look enough like the adults that an apple green abdomen with a tan thorax and light hen hackle would work, but I'd be happy to see a recipe for a proven pattern. And any thoughts on the general topic would be welcome.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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