According to R.E. Dimick from the Oregon State Agricultural College, the stonefly is a cornerstone in the diet of trout. The manuscript advises that a wise angler will observe the insects of an area to lead them to the best fishing spots. The document goes on to describe the life cycle of the stonefly as well as mentioning another type of stonefly, and where the author has found their population to be abundant.

This manuscript appears to be an edited version of "Trout flies".