Many new fly fishing anglers are shocked to learn that trout actually get a large percentage of their food from aquatic insects. This picture is a wonderful example of a large Yosemite Stonefly in its aquatic form. Depending on the species, they will spend anywhere from 1 to 4 years as a nymph and they will molt from 12 to 33 times before they become terrestrial. When there is nothing hatching above, always remember that you can fish large nymphs underwater to land beautiful wild trout. Try fishing two different sizes and also two different colors of a Stonefly imitation (I like the Gold Ribbed Hare's Ear(size 8 or 10) with a little Yellow Stonefly Nymph trailing about 16 inches below. Try this set up and see what you can hook into. As always, enjoy the fight!