In rivers, Caddis larvae can be divided into three basic types; case builders, net spinners and free-living roamers. All caddis larvae are subject to periodic behavioral drift cycles. This is how populations disperse themselves. Both Free-living and net spinning caddis larvae can produce a silken strand very much like spider web. To move down stream they will hook their line to a rock and then rappel themselves down stream. They are often dangling in the current for long periods. During these periods entire populations can be exposed to trout which will key on them exclusively. Caddis larva can be extremely vulnerable to catastrophic drift caused by high water, which can sweep them from the bottom.
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 "October Caddis Larva")