Updates from May 10, 2009

Mayflies

Caddisflies

Stoneflies

Closeup insects by Bnewell from the Big Thompson River in Montana

Cinygmula reticulata (Western Ginger Quill) Mayfly Nymph

View 1 PicturesI collected several live specimens of nymphs and reared them to the imago (Imago: The sexually mature adult stage of the mayfly is called the imago by scientists and the spinner by anglers.) stage. They were C. reticulata. The interesting thing is they were collected in May and were emerging along with Rhithrogena (March Brown). This seems to be an overlooked hatch since in some rivers it emerges very early, before runoff.

Collected May 10, 2009 from the Big Thompson River in Montana
Added to Troutnut.com by Bnewell on June 26, 2011

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Jargon Defined:

Imago: The sexually mature adult stage of the mayfly is called the imago by scientists and the spinner by anglers.

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).