7743

• UCREFRP Catalog Number: 7743
• Author: Miller, A. S. and W. A. Hubert.
• Title: Compendium of Existing Knowledge for Use in Making Habitat Management Recommendations for the Upper Colorado River Basin.
• USFW Year: 1990.
• USFW - Doc Type: \
• Copyright Material: NO

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• Lynn Kaeding reported hybrids from the Blackrocks reach on the
Colorado River (U.S. Fish and Wildlife Service, Grand Junction,
Colorado, personal communication).
Colorado squawfish
o No data exist in the literature to suggest that wild stocks of Colorado
squawfish hybridize with other species.
Bonytail chub
o The rarity of this species in the wild has precluded definitive conclusions
regarding hybridization of this species with roundtail chub or humpback chub
0 in the wild.
Razorback sucker
o Although known to occasionally hybridize with catastomids, no literature has
suggested that hybridization is a limiting factor for this species.
Com etition.
o Extreme fluctuation in the annual hydrograph may enhance spawning success
of native species and inhibit introduced species.
Haynes and Muth (1984) reported that species which evolved under
highly fluctuating conditions, such as those present in the Colorado River
C?