A die-off of koi carp, Cyprinus carpio, at a commercial rearing facility located in Spanish Fork, Utah, U.S.A., is reported. Although the cause of mortality in carp remained undetermined, moribund carp became heavily infested with Trichodina mutabilis and 6 species of Dactylogyrus (prevalence = 100%). Dactylogyrus formosus comprised the largest proportion of the dactylogyrid population on infested hosts (38.7%), followed by D. dulkeiti (28.8%), D. anchoratus (14.7%), D. baueri (8.6%), D. intermedius (8.0%), and D. minutus (1.2%). Occurrences of D. dulkeiti and D. baueri on Cy. carpio represent new host records. Dactylogyrus dulkeiti and T. mutabilis on carp in Utah are the first records of these species in the Nearctic.
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