C. F. O. Golden Stone Fly
Golden Stone Fly Much less important on the Yakima than Skwala americana and Claassenia sabulosa. Can be important locally and their numbers seem to be growing, particularly pacifica. The size of the emergence varies greatly from year to year. Pacifica is more common than californica. Emergence usually occurs in the late afternoon and evening. Egg laying activity is generally in the evening. Nymphs prefer fast, rocky runs and riffles and migrate to slower water to emerge. Emergence takes place on shore.
(One of the Yakima River WA Stoneflies)
Size: 8, 10