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Asian tapeworm (Bothriocephalus acheilognathi) in native fishes from the Little Colorado River, Grand Canyon, Arizona Examination of gastrointestinal tracts of native cyprinids from the Little Colorado River (LCR) in Grand Canyon, Arizona, 1990-1994, revealed varying rates of prevalence and infrapopulation levels of Asian tapeworm (Bothriocephalus acheilognathi). Mean prevalence was 28% (range 0-78%) in humpback chub (Gila cypha) and 8% (range 0-46%) in speckled dace (Rhinichthys osculus), with infrapopulations as high as 46 and 28, respectively. We also note Asian tapeworm infection of nonnatives common carp (Cyprinus carpio), fathead minnow (Pimephales promelas), and plains killifish (Fundulus zebrinus) from the LCR. Reported pathogenic and chronic effects of this cestode to its definitive hosts add concern for the status of... Categories: Publication; Types: Citation, Journal Citation; Tags: Bothriocephalus acheilognathi, Gila cypha, Little Colorado River, Rhinichthys osclllus, Western North American Naturalist, All tags... conservation, parasitism, Fewer tags