Dave Whitlock's Guide to Aquatic Trout Foods
The attempt to “match the hatch”―to pair a dry fly perfectly with 
its natural as the insect emerges―is something every fly fisher hopes to
 experience. Trout, however, eat all the time and have no intention of 
waiting for the mayflies to make up their mind. So, while an 
understanding of dry flies is truly important, the fly fisher who 
catches fish consistently knows about everything trout like to eat, a 
menu that includes a wide variety of aquatic species.  This
 book is your essential guide to all the crucial issues: How various 
flies imitate correctly a variety of food items. How to understand trout
 feeding patterns and watch the water to spot them. How to identify the 
important mayflies, stoneflies, caddisflies, midges, and other aquatic 
insects, and choose imitations. How to identify forage fish. And how to 
make proper presentations.  Throughout this book, the author's enjoyable black-and-white illustrations 
reinforce the discussion and give highly accurate portrayals of what the 
angler
 can expect to see in the field. A full-color section includes size and 
color charts for many major insects, crustaceans, and forage fish.