infection by a black spot-causing species of uvulifer and associated opercular alterations in fishes from a high-desert stream in spot is a common disease syndrome of freshwater fishes. this study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, uvulifer sp., infecting native and non-native catostomids and cyprinids of the upper colorado river basin. we evaluated the density rank of pigmented metacercariae and associated alterations in the operculum of the bluehead sucker catostomus discobolus, flannelmouth sucker c. latipinnis, ...200718286809
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