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Caddisfly Genus Arctopsyche (Great Gray Spotted Sedges)

Taxonomic Navigation -?-
» Genus Arctopsyche (Great Gray Spotted Sedges)

2 species aren't included.
Common Name
Arctopsyche grandis, the western species, is by far the most important in this genus. It produces excellent fishable hatches.

Larva & Pupa Biology


Diet: Smaller insects

Shelter Type: They spin and tend their nets instead of building a case.
The larvae live for two years before emerging and are especially prone to behavioral drift (Behavioral drift: The nymphs and larvae of many aquatic insects sometimes release their grip on the bottom and drift downstream for a while with synchronized timing. This phenomenon increases their vulnerability to trout just like emergence, but it is invisible to the angler above the surface. In many species it occurs daily, most often just after dusk or just before dawn.) at dawn and dusk.

Recent Discussions of Arctopsyche

Arctopsyche Grandis 6 Replies »
Posted by Epeorus on Jul 2, 2014
Last reply on Jul 6, 2014 by Entoman
A while ago there was some discussion of this bug in Colorado. I first came across this beast in early July 2011 on the Eagle River, just downstream of Edwards, Co. Met him again this week on the Eagle. It's quite the blast - big bugs and big trout. Especially the ones rising with abandon in the fast water in the middle of the day.

Funny thing is we don't seem to see these guys most years. The commonality between 2011 and this year is an extended runoff leading to cold and high - though clear water in early July. I wonder if they normally hatch during the peak of the runoff when no one is on the water.

I remember people commenting about these caddis allegedly being in parts of Colorado. The hatches the last two days on the Eagle and what I saw in 2011 would add some level of credence to that belief.

A size 10 (on a Partridge L3A) sponge body caddis with a dark gray body, and a size 10 Lafontaine sparkle emerger with a gray body and a clear shroud were the ticket.
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