Freshwater Invertebrate Underwater Pictures
Browse through all the underwater photos on this site below, or pick a category on the right.

This is my favorite underwater picture so far. It shows a bunch of Simuliidae (black fly) larvae clinging to a rock and swinging in the fast current. There are also at least four visible mayfly nymphs, probably in the family Baetidae.
In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and True Fly Family Simuliidae (Black Flies).
In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and True Fly Family Simuliidae (Black Flies).

Hundreds of cased caddisfly larvae live on this log in a small brook trout stream.
In this picture: Insect Order Trichoptera (Caddisflies).
In this picture: Insect Order Trichoptera (Caddisflies).

This Ephemerella subvaria (Hendrickson) nymph picture is one of my favorites.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson).
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson).

Hundreds of cased caddis larvae cling to sparse weed growth in the sand under heavy current.
In this picture: Insect Order Trichoptera (Caddisflies).
In this picture: Insect Order Trichoptera (Caddisflies).

Several Baetidae nymphs line up on a rock.
In this picture: Mayfly Family Baetidae (Blue-Winged Olives).
In this picture: Mayfly Family Baetidae (Blue-Winged Olives).

There's a large Ephemerella subvaria nymph in the top left.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson), Mayfly Species Ephemerella invaria (Sulphur), and Insect Order Trichoptera (Caddisflies).
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson), Mayfly Species Ephemerella invaria (Sulphur), and Insect Order Trichoptera (Caddisflies).


The mayfly and stonefly nymphs in this picture blend in extremely well.
In this picture: Insect Order Plecoptera (Stoneflies) and Mayfly Species Ephemerella invaria (Sulphur).
In this picture: Insect Order Plecoptera (Stoneflies) and Mayfly Species Ephemerella invaria (Sulphur).
These advertisements will disappear if you register.

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.
In this picture: Arthropod Order Decapoda (Crayfish) and Mayfly Species Hexagenia limbata (Hex).
In this picture: Arthropod Order Decapoda (Crayfish) and Mayfly Species Hexagenia limbata (Hex).

This picture from below shows a stillborn (Stillborn: In fly fishing, a stillborn insect is one which got stuck in its nymphal or pupal shuck during emergence and floats helplessly on the surface instead of flying away. It is a specific class of cripple, although it is sometimes used interchangeably with that term.) Ephemerella subvaria (Hendrickson) dun drifting on the surface amidst a number of shed pupal skins from Brachycentrus caddisflies which were heavily hatching that day.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Caddisfly Species Brachycentrus appalachia (Apple Caddis).
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Caddisfly Species Brachycentrus appalachia (Apple Caddis).

