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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.

Case view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
It's only barely visible in one of my pictures, but I confirmed under the microscope that this one has a prosternal horn and the antennae are mid-way between the eyes and front of the head capsule.

I'm calling this one Pycnopsyche, but it's a bit perplexing. It seems to key definitively to at least Couplet 8 of the Key to Genera of Limnephilidae Larvae. That narrows it down to three genera, and the case seems wrong for the other two. The case looks right for Pycnopsyche, and it fits one of the key characteristics: "Abdominal sternum II without chloride epithelium and abdominal segment IX with only single seta on each side of dorsal sclerite." However, the characteristic "metanotal sa1 sclerites not fused, although often contiguous" does not seem to fit well. Those sclerites sure look fused to me, although I can make out a thin groove in the touching halves in the anterior half under the microscope. Perhaps this is a regional variation.

The only species of Pycnopsyche documented in Washington state is Pycnopsyche guttifera, and the colors and markings around the head of this specimen seem to match very well a specimen of that species from Massachusetts on Bugguide. So I am placing it in that species for now.

Whatever species this is, I photographed another specimen of seemingly the same species from the same spot a couple months later.
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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Brachycentrus appalachia (Apple Caddis) Caddisfly Adult Pictures

I captured this specimen in the same color as this photograph, during its egg-laying flight. The emergers are much lighter.

Ruler view of a Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.
Lateral view of a Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York
Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the West Branch of the Delaware River in New York

This caddisfly was collected from the West Branch of the Delaware River in New York on May 13th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Adult

caddis flies
2 replies
Posted by Flytyer0423 on Aug 11, 2009
Last reply on Aug 11, 2009 by GONZO
do all caddis flies have brown or a close shade to brown legs all the ones i looked at so far are either brown or a light brown almost tan
Emergence
Posted by Martinlf on May 7, 2009
Last reply on May 7, 2009 by Martinlf
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.
Mating of black caddis
32 replies
Posted by Reify on Jul 7, 2007
Last reply on Jul 17, 2007 by Shawnny3
I read a nice article on black caddis swarming/ mating and it mentioned that one oof the few times a trout will readily hit black caddis on the surface is when a coupled mating pair fail to rise from the swarm and fall onto the surface; there's apparently 20 seconds or so before they can separate and they are vulnerable to trout - and trout know it and look for coupled black caddis under/ down stream from swarms. The author went on to say that patterns mimicking that situatuion were very successful, as are good black caddis emerger patterns. What he didn't give were the patterns he uses or the position the male and female would likely be in during coupling so that the reader may know where/ how to position the male and female for such a pattern. It's a tough enough matter to tie a paired insect pattern without knowing the orientation; does anyone have a clue about this? It could very well be that orientation doesn't matter since the pair apparently struggle violently to separate and get back aloft, so maybe any willy-nilly way a tier manages to construct a mock-pair of copulating black caddis on a single; or maybe better two hooks will suffice.

Our black caddis population where I fish is growing very fast over the years and they are on the water almost the whole season; the emerger works great in mid to late afternoon,and I've got several good working patterns for it. But when the swarm forms, the only trout feeding on adults are ones leaping to grab the fluttering swarm members (males) or random egglayers (females) and imitating them is, of course futile. If the female fell into the drink after ovipositing, that would be nice, we'd have a different situation, where trout would feed on fallen females; but the females don't do that, rather, they fly off to the trees or meadows along the stream and die there.

If, like this author claims, trout key on struggling coupled mating pairs, a good pattern would be nice to have. Any ideas on how to do this will be welcome.

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Brachycentrus appalachia (Apple Caddis) Caddisfly Adult Pictures

Collection details
Location: West Branch of the Delaware River, New York
Date: May 13th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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