7888

• UCREFRP Catalog Number: 7888
• Author: Minckley, W. L.
• Title: Native Fishes And Natural Aquatic Habitats In U.S. Fish And Wildlife Service Region II West Of The Continental Divide, A Review of Population and Habitat Status and Evaluation of Survival Potentials for Native Freshwater Fishes, with Recommendations.
• USFW Year: 1985.
• USFW - Doc Type: \
• Copyright Material: NO

Fiaure

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LIST OF FIGURES

Paae

1

The lower San Juan River, with locations of major cities and
towns. Cross-hatching indicates the area depicted in Figure 3 3

Major tributaries of the San Juan River between Navajo Dam and
Lake Powe 11 ...................... 3

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Diversion structures within the study area. River miles are
given for all diversion structures. Single digit Arabic numerals
indicate the location of structures .. . . . . . . . . . . . . . 4

4

Most abundant species collected from the San Juan River in 1991
and 1992, all sampling methods combined . . . . . . . . . . . . . 11

Percent composition of the seven most abundant species collected
in the San Juan River in 1991 and 1992, all sampling methods

comb i ned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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Mean number of fish per mile of electrofishing for the six most
abundant species collected in 1991 and 1992. Histograms
represent all sampling trips in a single year . . . . . . . . . . 13

Mean number of fish captured per mile of electrofishing for the
six most abundant species collected in 1991. Bars represent
each trip in which a specific river reach was sampled . . . . . . 14

Mean number of fish captured per mile of electrofishing for the
six most abundant species collected in 1992. Bars represent
each trip in which a specific river reach was sampled . . . . . . 15

Original capture locations for all Colorado squawfish caught in
1991 and 1992. Locations are also given for Colorado squawfish
captured by electrofishing during a 1987-1989 study. . . . . . . . 19

Original capture locations for all roundtail chub caught in 1991
and 1992. Locations are also given for roundtail chub captured
by electrofishing during a 1987-1989 study. . . . . . . . . . . . 20

Location of Colorado squawfish and roundtail chub observations
during 1991 and 1992. Locations are also given for two Colorado
squawfish sightings from a 1987-1989 study. . . . . . . . . . . . 23

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Year-round movement of nine radio-tagged Colorado squawfish as
established by 113 radio contacts from June 1991 to January 1993.
Vertical dashed lines indicate the Mixer area (RM 133.4-129.8)
and the Mancos River (RM 122.6). Horizontal dashed lines
indicate the presumed spawning period . . . . . . . . . . . . . . 24

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