Humpback Chub Page

Description

Fish Species of the Colorado River in Lower Glen Canyon and Grand Canyon (See Fish Table)	TBD (TBD)	TBD (TBD)

GROUP MEMBERS

No Ad-Hoc Group currently assigned

POTENTIAL THREATS:
Smallmouth Bass -- In early 2000, smallmouth bass increased dramatically in abundance in the Yampa River and Upper Colorado River. Just over a decade later, the species cannot be brought under control.
"Prior to Glen Canyon Dam, the Colorado River was dominated by highly predacious non-native channel catfish. Catfish are warm water fish...Regular flooding of the LCR may be keeping catfish out of the LCR and cold water in the Colrado River does not provide habitat for catfish or other warm water fish. Without Glen Canyon Dam chubs may have been extirpated from Grand Canyon, catfish would still be the dominant fish in the Colorado River and the LCR." (090711_Minority Report to TWG_FFF_Mark Steffen)
Should a disaster such as a landslide cut off the Little Colorado chub from the mainstem, the species could quickly become extinct -Article LINK

INFORMATION
NPS Endangered Fish Learning "NNFC will occur if necessary because it is a conservation measure required under the ESA to ensure protection of the HBC." Mitigation for the impact of implementing NNFC on resources of tribal concern is addressed under the NHPA OA for NNFC. The (HBC) juvenile abundance estimate for the mainstem at the LCR is over 2,500 fish, and is above the conservation measure trigger for nonnative fish control in the FWS biological opinion of 900.130220 AMWG Minutes
Reports and Links
2015 Chute Falls Translocation Update Humpback Chub Translocations to Shinumo and Havasu Creeks, Grand Canyon National Park Humpback Chub in the Colorado river: Status and Trends of Aggregations, Changes in Range Early Life History of Humpback Chub: Patterns and Potential Drivers Biological Opinion Trigger Update: January 2015 2011 Warming increases the growth rates of Humpback Chubs
Other Stuff