What's in the Hump of the Humpback Chub?

2020 ◽  
Vol 80 (1) ◽  
pp. 98
Author(s):  
David L. Ward ◽  
Michael B. Ward
Keyword(s):  
Humpback Chub

Distribution and Movement of Humpback Chub in the Colorado River, Grand Canyon, Based on Recaptures

2006 ◽  
Vol 135 (2) ◽  
pp. 539-544 ◽  
Author(s):  
Craig P. Paukert ◽  
Lewis G. Coggins ◽  
Christopher E. Flaccus
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Humpback Chub

Spatiotemporal Variation in Length–Weight Relationships of Endangered Humpback Chub: Implications for Conservation and Management

2000 ◽  
Vol 129 (2) ◽  
pp. 419-428 ◽  
Author(s):  
Vicky J. Meretsky ◽  
Richard A. Valdez ◽  
Michael E. Douglas ◽  
Mark J. Brouder ◽  
Owen T. Gorman ◽  
...  
Keyword(s):  
Spatiotemporal Variation ◽  
Humpback Chub ◽  
Conservation And Management

scholarly journals Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

2017 ◽  
Vol 8 (1) ◽  
pp. 333-342 ◽  
Author(s):  
Forest P. Hayes ◽  
Michael J. Dodrill ◽  
Brandon S. Gerig ◽  
Colton Finch ◽  
William E. Pine III
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Management Program ◽  
Parameter Estimates ◽  
Water Release ◽  
Fish Removal ◽  
Glen Canyon Dam ◽  
Management Actions ◽  
Humpback Chub ◽  
Glen Canyon

Abstract Determining the population status of endangered Humpback Chub Gila cypha is a major component of the adaptive management program designed to inform operation of Glen Canyon Dam upstream from Grand Canyon, Arizona. In recent decades, resource managers have identified a portfolio of management actions (with intermittent implementation) to promote population recovery of Humpback Chub, including nonnative fish removal, changes in water release volumes and discharge ramping schedules, and reductions in hydropower peaking operations. The Humpback Chub population in Grand Canyon has increased over this same period, causal factors for which are unclear. We took advantage of unusual hydrology in the Colorado River basin in 2011 to assess trends in juvenile Humpback Chub length–weight relationships and condition in the Colorado River below Glen Canyon Dam as well as in the unregulated Little Colorado River. Within each river, we observed higher length–weight b-parameter estimates (exponent of the standard power equation) at higher water temperatures. We also found higher slope estimates for the length–weight relationship at higher temperatures in the Little Colorado River. Slope estimates were more variable in the Colorado River, where mean water temperatures were more uniform. The next step is to examine whether Humpback Chub length–weight relationships influence population metrics such as abundance or survival. If these relationships exist, then monitoring condition in juvenile Humpback Chub would provide a quick and low-cost technique for assessing population response to planned management experiments or changing environmental conditions.

A Laboratory Evaluation of Tagging-Related Mortality and Tag Loss in Juvenile Humpback Chub

2015 ◽  
Vol 35 (1) ◽  
pp. 135-140 ◽  
Author(s):  
David L. Ward ◽  
William R. Persons ◽  
Kirk L. Young ◽  
Dennis M. Stone ◽  
David R. Vanhaverbeke ◽  
...  
Keyword(s):  
Laboratory Evaluation ◽  
Tag Loss ◽  
Humpback Chub ◽  
Related Mortality

Experimental infection of the endangered bonytail chub (Gila elegans) with the Asian fish tapeworm (Bothriocephalus acheilognathi): impacts on survival, growth, and condition

2006 ◽  
Vol 84 (10) ◽  
pp. 1383-1394 ◽  
Author(s):  
S.P. Hansen ◽  
A. Choudhury ◽  
D.M. Heisey ◽  
J.A. Ahumada ◽  
T.L. Hoffnagle ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Grand Canyon ◽  
River System ◽  
Health Condition ◽  
Infected Fish ◽  
Control Fish ◽  
Potential Threat ◽  
Humpback Chub ◽  
Bothriocephalus Acheilognathi ◽  
Negative Impacts

Bothriocephalus acheilognathi Yamaguti, 1934, a tapeworm known to be pathogenic to some fish species, has become established in the endangered humpback chub ( Gila cypha Miller, 1964) in Grand Canyon, USA, following the tapeworm’s introduction into the Colorado River system. The potential impact of this tapeworm on humpback chub was studied by exposing the closely related bonytail chub ( Gila elegans Baird and Girard, 1853) to the parasite under a range of conditions that included potential stressors of humpback chub in their natal waters, such as abrupt temperature change and a limited food base. Survival of infected fish under low food rations was considerably lower than that of control fish, and mortality of infected fish began 20 days earlier. Growth of infected fish was significantly reduced, and negative changes in health condition indices were found. No significant negative impacts were revealed from the synergistic effects between temperature shock and infection. Bothriocephalus acheilognathi does present a potential threat to humpback chub in Grand Canyon and should be considered, along with conventional concerns involving altered flow regimes and predation, when management decisions are made concerning conservation of this endangered species.

Sign in / Sign up

Export Citation Format

Share Document