7337

• UCREFRP Catalog Number: 7337
• Author: Valdez, R. A., R. J. Ryel and R. Williams.
• Title: Endangered Fishes of Cataract Canyon
• USFW Year: 1986.
• USFW - Doc Type: The Importance of the Colorado River above Lake Powell to the Colorado Squawfish, Humpback Chub, and Bonytail.
• Copyright Material: NO

~ .

Little can be concluded from the capture of two possible bony tail from

Ca ta ract Canyon.
infrequently that
distribution. The
Cataract indicates
Green Ri ver.

This rarest of the endangered fishes is caught so
little is known of its habitat needs and current
absence of adult roundtail chub from collections in
similarities with the Gila complex in reaches of the

This study has indicated that Cataract Canyon and the lower Green River
may be important regions in the upper Colorado River basin for the Colorado
squawfish, humpback chub, and bony tail and warrant further investigations.
The high density of yay squawfish in the lower Green and the moderate levels
observed in Cataract Canyon suggest that both of these areas may be
important nurseries for young hatched in the lower regions of the basin.
The presence of adul t and yay humpback chub in the region suggest that it
may support a viable population of these fish.

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