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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.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Stenonema (March Browns and Cahills) Mayfly Nymph Pictures

Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from Cayuta Creek in New York
Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from Cayuta Creek in New York
Dorsal view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from Cayuta Creek in New York
Ventral view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from Cayuta Creek in New York
Ruler view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from Cayuta Creek in New York The smallest ruler marks are 1 mm.

This mayfly was collected from Cayuta Creek in New York on April 14th, 2007 and added to Troutnut.com by Troutnut on April 22nd, 2007.


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Stenonema (March Browns and Cahills) Mayfly Nymph Pictures

Collection details
Location: Cayuta Creek, New York
Date: April 14th, 2007
Added to site: April 22nd, 2007
Author: Troutnut
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