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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.

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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Posts: 1
Mrhackyman on Jul 11, 2011July 11th, 2011, 3:52 am EDT
Hello. I'm from central PA and my friend and I have found a guaranteed harvest spot on a local stream to gather hellgrammites for bait. We know exactly where to find them and they are always in the same spot. I was wondering if we continue to take from the same spot week after week, could we have a major effect on their populations in this stream. We see hundreds of very small larvae and we never take more than we can use. Maybe a half dozen or a dozen weekly. As they mature and grow, do they travel up or down stream or do they basically stay under the same rock beds their entire larvae life? Thanks everyone.
PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Jul 11, 2011July 11th, 2011, 5:37 am EDT
Dunno. Most likely some get swept downstream with spates. As to collecting them. I can't imagine a couple guys would damage the numbers appreciably collecting occasional bait from healthy habitat. But...I dunno.
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on Jul 11, 2011July 11th, 2011, 10:05 am EDT
I think we have been down this path before...Or looked under this rock before. There should be a thread stored somewhere here...Maybe you could search for it.

1) Someone will wonder about the "real" availability of the hellgrammite to the fish...They are pretty tenacious about hiding away...You can turn over some good sized boulders but the bass can't. The adult I will only swear to having seen once in many many years of hanging around streams and that was this past June.

2) Then Spence will suggest that this is, after-all, a fly-fishing site and he'll suggest something like a Murray's Hellgrammite pattern or a Wooley Bugger both very simple flies to tie...In fact probably the first fly any beginner does tie.

3) Someone else will bring up that some states have rules and licenses for folks "harvesting" live bugs from the stream...There may be an escape clause if you are using them for your own use, but don't sell them to anybody. Spence usually brings up the "wigglers" that are sold here in Michigan.

4) Jonathon will offer you a dozen KBF's at $29.95 plus shipping & handling.

I agree with Paul, for what my opinions worth, and I don't think it's such a big deal...Until maybe everyone's doing it...I've run in to a few guys that have been doing it on a river I fish for years and everything seems ok...

That should cover it I guess...Did I miss anything?

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
Ditch's profile picture
Fuquay-Varina NC

Posts: 36
Ditch on Jul 11, 2011July 11th, 2011, 4:14 pm EDT
Think you covered it Spence.
There are no bad fishing days.
Warren ohio

Posts: 1
Fisherchick on Jul 14, 2011July 14th, 2011, 9:15 am EDT
I found one of these Dobson Flies in one of my windows the other night, and i have never seen one before i live in northeastern ohio. I kept it in a bug cage and it has laid eggs in there i don't know what i should do with it as far as releasing it by a pond or how to get the eggs out with out damaging them, or if i could give them to a bait shop that sells them the only problem is i have called over 20 bait shops and no one has ever sold them and few have heard of them... Any suggestions???
PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Jul 14, 2011July 14th, 2011, 9:31 am EDT
She's layed her eggs and will die. As to the eggs -your call. They supposedly hatch and then drop into the water. Might be interesting to put some (non-tap) water beneath them and see what happens. Might end up with the scariest pets on the block.

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