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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.

Sunlight perfectly strikes the trees at a bend in the Foss River in the Washington Cascades. From the Foss River in Washington

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly LarvaLimnephilus (Summer Flier Sedge) Caddisfly Larva
Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington
This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.
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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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Freshwater Invertebrate Underwater Pictures, Page 2

Freshwater Invertebrate Underwater Pictures, Page 2

Underwater photos of freshwater invertebrates in their natural habitat.

There's a stonefly nymph in the bottom right corner of this picture, but what's really interesting is those white blotches. They're pretty common in my Wisconsin home river river, stuck flat onto the rocks--lots of rocks have a speckled look as a result. They are microcaddis cases, made by larvae of the caddisfly family Hydroptilidae. These are made by larvae of the subfamily Leucotrichiinae, most likely the genus Leucotrichia. They spin little flat oval cases of silk tight and immobile against the rocks.
Hundreds of cased caddis larvae cling to sparse weed growth in the sand under heavy current. From Eighteenmile Creek in Wisconsin
A variety of cased caddisfly larvae, probably mostly Neophylax, have clustered along the backside of a rock in fast water. There seem to be some Helicopsychidae larvae clustered along the bottom, and a few other taxa are mixed in. It's interesting that several larvae have especially large stones placed over the front openings of their cases, perhaps to block the case off for pupation. It does seem to be the wrong time of year for Neophylax to be pupating, but that was the ID given for one of these which I collected and photographed up close. From Cayuta Creek in New York
Several caddis larvae cling in the current amongst the debris collected on an underwater alder branch. From the South Fork of the White River in Wisconsin
A crayfish chews on a Hexagenia limbata nymph shortly after a small Hex emergence. I didn't catch any fish, but playing around with my flashlight and camera in the rocks proved productive.
The West Branch of the Delaware River in New York
The mayfly and stonefly nymphs in this picture blend in extremely well.
Several Baetid mayfly nymphs cling to this rock. There are also some clumps of small stones which hold strong caddisfly larvae. From Eighteenmile Creek in Wisconsin
A careful look at this picture reveals at least three water boatmen swimming around.
A large school of water boatman swims over a strange purple substance at a crystal clear spring. From Mystery Creek # 90 in Wisconsin
A few caddis larvae cling to this partially submerged clump of streamside grass. From the South Fork of the White River in Wisconsin
The strange tubes all over this rock house tiny midge larvae.
A small stonefly nymph crawls around some gravel. From Eighteenmile Creek in Wisconsin
Eighteenmile Creek in Wisconsin
Mongaup Creek in New York
Mongaup Creek in New York
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