7321

• UCREFRP Catalog Number: 7321
• Author: U.S. Fish and Wildlife Service.
• Title: Fish and Wildlife Service Upper Colorado River Basin Technical Advisory Study Important Reach Analysis - CRFP.
• USFW Year: 1984.
• USFW - Doc Type: \
• Copyright Material: NO

Tyus, H. M. 1984. Loss of passage as a factor in the decline
of the endangered Colorado squawfish. In Issues and technology
in management of impacted Western wildlife. Thorne Ecological
Institute. Tech. Pub1. No. 14, Boulder, Co. pp. 138-144.

Wick, et al. 1983. Observations in the ecology of Colorado
squawfish Ptychoceilus lucius in the Yampa River, Colorado, 1982.
NPS and CDOW Report No. 83.7 Fort Collins, co. pp. 6-9.

Data Summaries: Tables 5-8

HUMPBACK CHUB

Spawning Habitats

Assumptions :

1. Humpback chub carry out their entire life cycle in the relatively
confined deep, swift canyon areas where adult populati.ons
are found.

Classification: Confimed spawning areas

Criteria

1. Presence of ripe females during spawning season.

2. Presence of a range of size classes.

3. Deep Canyon habitat.

Classification: Suspected spawning area

Criteria

1. Presence of adults

2. Deep canyon habitat

Larval-Juvenile-Adult Habitats

Assumptions :

1. All life-stages of humpback chub inhabit the same or closely
associated habitats in deep, swift canyon areas.

Classification: High density areas

.23