Some caddis larva will build a case to reside in before the pupa stage. You may have snagged one with your nymph rig and wondered what it was. Cased-caddis larvae often become dislodged in the currents of swift riffles.  When trout find them, they eat them -- case and all.

available in size 16

Cased Caddis

$1.89Price