The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Some anglers consider caddisflies to be even more important than mayflies, and on many rivers they're right. Angler-entomologists focus less energy on them because they are slightly less prone to cause a feeding frenzy among the trout. While that does happen, they are more commonly an intermittent food source during the times when it seems like nothing's hatching. Understanding their life cycle is of paramount importance to any fly fisher, but learning their quirks species-by-species is less useful than with mayflies.
Like most common names,"Caddisfly" can refer to more than one taxon. They're previewed below, along with 3 specimens. For more detail click through to the scientific names.