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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Skwala (Large Springfly) Stonefly Nymph Skwala (Large Springfly) Stonefly Nymph

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.

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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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Apatania larvae and pupae

Millcreek has attached these 3 pictures. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 17, 2016February 17th, 2016, 11:04 am EST

These were collected during the spring and summer from Mill Creek, a tributary of Dry Creek and the Russian River. They were collected from areas with a moderate flow and a gravel and cobble base. There was little filamentous algae but good growths of diatoms.

The larvae and pupae are 6-7 mm. The cases are 8 mm.

The larvae were identified using Merritt, Cummins and Berg (2008). The pupae were identified to family using the above.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Feb 17, 2016February 17th, 2016, 2:31 pm EST

Great photos, as usual. Thanks!

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

--Fred Chappell

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Feb 18, 2016February 18th, 2016, 3:53 am EST

Nice Matt. Interesting thing about some Apatania I seem to recall that in some places females greatly out number males and there is parthenogenesis.

PaulRoberts