7739

• UCREFRP Catalog Number: 7739
• Author: Muth, R. T. and T. P. Nesler.
• Title: Associations Among Flow and Temperature Regimes and Spawning Periods and Abundance of Young of Selected Fishes, Lower Yampa River, Colorado, 1980-1984 - Final Report.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

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1.

LIST OF FIGURES

Paee
Yampa River study area, 19~1984 ............................................. 4

2.

Gradient proffie of the lower Yampa River, Colorado, from just upstream of Cross
Mountain Canyon to the Yampa-Green River ronfluence . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

3.

Annual discharge regimes of the lower Yampa River, Colorado, April-October,

1980-1984 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10

4.

Annual water-temperature regimes of the lower Yampa River, Colorado,

Apri1-C>ctober, 1980-1984 .................................................... 12

s.

Estimated annual spawning periods for selected fishes, lower Yampa River,
Colorado, 1980-1984, and rorrelations among years between estimated number of
days, beginning April 1, to annual initiation of spawning and estimated total number
of days in the annual spawning period for each taxon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16

6.

Percentage rontributed by each taxon to the total number of age-O fISh rollected
per 1,000 m2 sampled per year, lower Yampa River, Colorado. . . . . . . . . . . . . . . . . . . . . . . .. 20

7.

A) Annual discharge parameters during April and May for the lower Yampa River,
Colorado. B) Estimated number of days, beginning Aprill, to annual initiation of
spawning for selected fishes, lower Yampa River, Colorado ........................... 23

8.

A) Annual discharge parameters during April-July for the lower Yampa River,
Colorado. B) Estimated total number of days in the annual spawning period for
selected fishes, lower Yampa River, Colorado ..................................... 24

9.

A) Annual discharge parameters during April-July for the lower Yampa River,
Colorado. B) Total annual catch-per-unit-effort of age-O fISh for selected fishes,
lower Yampa River, Colorado. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2S

10.

A) Annual cumulative degree-days for selected mainchannel water temperatures
during April and May, lower Yampa River near Maybell, Colorado. B) Estimated
number of days, beginning April 1, to annual initiation of spawning for selected
fishes, lower Yampa River, Colorado. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26

11.

A) Annual cumulative degree-days for selected mainchannel water temperatures
during April-July, lower Yampa River near Mayben, Colorado. B) Estimated
total number of days in the annual spawning period for selected fIShes, lower

Yampa River, Colorado. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 27

12.

A) Annual cumulative degree-days for selected mainchannel water temperatures
during April-July, lower Yampa River near Maybell, Colorado. B) Total annual
C8tch-per-unit-effon of age-O fish for selected fishes, lower Yampa River, Colorado ......... 28

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