Yuma Public Library

Information on whirling disease, a malady of trout and salmon caused by a microscopic parasite that produces a spore. Information on the page and links to other sources provide information on the effects of the disease on the fish, the spread of the disease through the state, and links to reports on current research.

Mountain whitefish (Prospoium williamsoni) are native to the Yampa and White River drainages in Colorado. Mountain whitefish population declines have recently been reported in Colorado in the Yampa River and its tributaries. The apparent onset of population declines in the decade after introduction of M. cerebralis in these locations raised the question of the role of whirling disease in these losses.