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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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Mystery Creek #308 in Washington

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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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Sweltsa (Sallfly) Stonefly Nymph Pictures

This was by far the most abundant stonefly in my sample on May 14th.

Ruler view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

Ventral view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

False color image enhancing contrast on the setae on the tails. On the right tail (top), a few setae appear as double images due to an artifact of the focus stacking proces.

Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on May 14th, 2022 and added to Troutnut.com by Troutnut on May 16th, 2022.

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