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.

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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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Crazy looking Nymph?

ReelnCreel has attached this picture to aid in identification. The message is below.

ReelnCreel
Posts: 3

ReelnCreel on Apr 25, 2010April 25th, 2010, 1:35 pm EDT

Hi,

I live in Nova Scotia. Found this guy in a river that runs into the Avon River which runs into the bay of fundy. This guy was not far from a tidal area. Hes quite different from all the other nymphs in the area which I assume where mayfly. Only one tail and its quite red. Just wondering what it is.

Thanks

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Apr 25, 2010April 25th, 2010, 1:39 pm EDT

Cool. The bug guys will eventually have a go at this. Are you sure about the one tail, though? Could the other(s) have been broken off at some point?

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Dryfly
rochester mn

Posts: 133

Dryfly on Apr 25, 2010April 25th, 2010, 1:44 pm EDT

It's a heptageniid. No idea what species though.

ReelnCreel
Posts: 3

ReelnCreel on Apr 25, 2010April 25th, 2010, 1:46 pm EDT

pretty sure about the one tail, he had it raised at one point

Wiflyfisher

Wisconsin

Posts: 622

Wiflyfisher on Apr 25, 2010April 25th, 2010, 2:47 pm EDT

That is definitely looks like a Heptageniidae mayfly. When their tails are wet they tend to cling together. See this photo...

John S.
https://WiFlyFisher.com

ReelnCreel
Posts: 3

ReelnCreel on Apr 26, 2010April 26th, 2010, 11:42 am EDT

Yeah, simply searching for mayfly nymph pictures i get a few that look the same and have very similar coloring. It's crazy how diverse insects are. I've seen two other types of nymphs in the same area, having completely different size and colors but more common shape. Not to mention all the other creepy crawlies. Thanks a lot for your help guys.