7998

• UCREFRP Catalog Number: 7998
• Author: Desert Fishes Council, G. a. S., ed.)‎.
• Title: Proceedings of the Desert Fishes Council Volume XXVII, 1995 Annual Symposium.
• USFW Year: 1996.
• USFW - Doc Type: November, 16-19.
• Copyright Material: NO

PROCEEDINGs OF THE DESERT FISHES COUNCIL, 1995 Sywosium VOUJWXXVH-PUEUSI-.D1996
culturales del area, 4) integraci6n de todas las actividades de manejo de recursos en el area, 5) prevend6n
de degradad6n de recursos, 6) promod6n de cooperad6n entre agencias para manejo a investigaci6n en el
area, y 7) proveer actividades recreacionales y de pastoreo de ganado consistentes y con enfasis en
protecci6n de recursos.
BROUDER, M. J.*; HOFFNAGLE, T. L. (Rewash Brardb A.U. G. and Fish Department, Flagtat[, AZ)
Distribution and prevalence of the Asian tapeworm, Bothriocephalus acheilognathi, in the Colorado
River and its tributaries, Grand Canyon
KEYWORDS: Asian tapeworm; Colorado River; Grand Canyon
ABSTRACT
The Asian tapeworm, Bothriocephalus acheilognathi, was introduced into the United States via imported
grass carp in the early 1970's. It has since become well established in the southeast and mid-south and has
been recently found in the southwest. The definitive host in the life cycle of B. acheilognathi is cyprinid
fishes and therefore, is a potential threat to the federally endangered humpback chub, Gila cypha, in the
Colorado River, Grand Canyon. In past studies, Arizona Game and Fish Department has found that
humpback chub in the little Colorado River (LCR) were infested with the Asian tapeworm. However, the
cold water of the mainstem Colorado River may be limiting their expansion beyond the LCR This study
was conducted to determine the prevalence of B. acheilognathi in two cyprinid fishes, fathead minnows,
Pimephaks promelas, and speckled dace, Rhinichthys osculus, and determine if it has expanded its distribution
to sites outside of the LCR Preliminary data from 1994 show that 54% of the humpback chub, 27% of the
speckled dace, and 6% of the fathead minnows that were caught were infested with the Asian tapeworm.
All infested humpback chub were caught in a 15-mile stretch of the Colorado River just downstream from
the mouth of the LCR, the likely source of their infestation.
RESUMEN
El Asian tapeworm, Bothriocephaha acheilognathi, fue introducido en Estados Unidos via importaci6n de
grass carp a principio de los 1970's. Desde entonces se estableci6 en el sureste y parte central sur y
redentemente se encontr6 en el Surceste. El hospedero definitivo en el cido de vida de B. acheilognathi son
los peces ciprinidos y por ello, es una amenaza potential para el charalito jorobado, Gila gpha considerada
amenazada por la federad6n en el Colorado River, Grand Canyon. En estudios anteriores, Arizona Game
and Fish Department encontr6 que el charalito jorobado en el Little Colorado River (LCR) estaba infestado
con el Asian tapeworm. Sin embargo, el agua fria de la corriente principal del Colorado River puede estar
limitando su expansion a traves del LCR Este estudio se efectu6 para determinar la prevalencia de B.
acheilognathi en dos especies de ciprinidos, los fathead minnows, Pimephales promelas, y el speckled dace,
Rhinichthys osculus, y determinar si ha expandido su distribuci6n a sitios fuera del LCR Los datos
preliminares de 1994, muestran que el 54% de los charalito jorobado, 27% de los speckled dace, y el 6%
de los fathead minnows, capturados estaban infestados con el Asian tapeworm. Todos los charalito
jorobado infestados fueron capturados en un tramo de 15 millas del Colorado River aguas abajo de la boca
del LCR, la que parece ser la fuente de su infestac16n.
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