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Your friend Fred sent you this picture from, a website about fly fishing for trout. It has thousands of close-up pictures of the bugs trout eat and information about how those bugs behave and how to catch choosy trout. There's more...

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Hey Bob, have a look at this website. If I don't get out fishing soon my head's gonna pop.
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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.
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