Freshwater Invertebrate Underwater Pictures, Page 4
Browse through all the underwater photos on this site below, or pick a category on the right.

Cased caddis larvae blanket this section of stream bottom.
In this picture: Insect Order Trichoptera (Caddisflies).
In this picture: Insect Order Trichoptera (Caddisflies).


There's a very well-camouflaged Baetisca laurentina mayfly nymph resting on the twig in the bottom left corner of this picture. Can you spot him?
In this picture: Mayfly Species Baetisca laurentina (Armored Mayfly).
In this picture: Mayfly Species Baetisca laurentina (Armored Mayfly).


An Ephemerella subvaria nymph clings to a white rock in the foreground, and there are other nymphs in the background.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Insect Order Trichoptera (Caddisflies).
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Insect Order Trichoptera (Caddisflies).

This log houses several Ephemerella mayfly nymphs and, on the top right, an Epeorus mayfly nymph.
In this picture: Mayfly Species Ephemerella invaria (Sulphur) and Mayfly Genus Epeorus (Little Maryatts).
In this picture: Mayfly Species Ephemerella invaria (Sulphur) and Mayfly Genus Epeorus (Little Maryatts).

Several Baetid mayfly nymphs cling to this rock. There are also some clumps of small stones which hold strong caddisfly larvae.
In this picture: Insect Order Trichoptera (Caddisflies) and Mayfly Family Baetidae (Blue-Winged Olives).
In this picture: Insect Order Trichoptera (Caddisflies) and Mayfly Family Baetidae (Blue-Winged Olives).

This isn't really an underwater picture, but a picture taken into my aquarium of midge larvae which lived in the silt I used for substrate. Each larva has a little tower of detritus (Detritus: Small, loose pieces of decaying organic matter underwater.) built up along the bottom, while the bare larva waves around from the top.
In this picture: True Fly Family Chironomidae (Midges).
In this picture: True Fly Family Chironomidae (Midges).

This is a close-up underwater view of 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 (Henrickson) female dun.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson).
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson).

I spotted this very large leech freely tumbling, and occasionally stopping, along the bottom of a clear, cool trout stream. I paid careful attention later and spotted two more like it, but this one was the largest -- probably over 7 inches stretched out.
There is one other picture of it.
In this picture: Animal Class Clitellata-Hirudinae (Leeches).
There is one other picture of it.
In this picture: Animal Class Clitellata-Hirudinae (Leeches).

