“…the trout is shy and sophisticated.  To overcome his sophistication, we must study his habits carefully.  His biggest advantage is selectivity, and we can counteract it only by knowing the insects that make up his diet.  This is the reason for the study of stream entomology by the angler….Stream tactics can be learned by experience, but stream entomology can be learned only by serious study….The insect population on our better streams is sufficient to sustain even the largest fish.  Research has shown that the immature stages of stream insects are so numerous that each acre of bottom conceals about 100 pounds of nymphs and larvae.  Particularly rich streams have as much as 200 pounds per acre of bottom.” - E. G. Schwiebert, Jr.