Endangered fish threatened by Asian fish tapeworm

Fact Sheet 2005-3057



The Asian fish tapeworm, an exotic parasite, has invaded the endangered humpback chub (Gila cypha) population from the Colorado and Little Colorado Rivers in Grand Canyon, Arizona. This parasite causes disease and death in carp in aquaculture settings and may retard growth in hatchery-reared roundtail chub (Gila robusta). Other consequences include destruction and dysfunction of the intestinal lining and adverse changes to certain blood parameters. Introduced into the U.S. in the 1970s with imported grass carp (Ctenopharyngodon idella), the Asian fish tapeworm (Bothriocephalus acheilognathi) was discovered in the Little Colorado River (LCR) by 1990. The LCR is the main tributary to the Colorado River in Grand Canyon and is an important spawning area for humpback chub.

Suggested Citation

Cole, R.A., 2004, Endangered fish threatened by Asian fish tapeworm: U.S. Geological Survey Fact Sheet 2005–3057, 1 p., https://pubs.er.usgs.gov/publication/fs20053057.

ISSN: 2327-6932 (online)

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Endangered fish threatened by Asian fish tapeworm
Series title Fact Sheet
Series number 2005-3057
DOI 10.3133/fs20053057
Year Published 2004
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) National Wildlife Health Center
Description 1 p.
Scale 100000
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional metadata about this publication, not found in other parts of the page is in this table