9299

• UCREFRP Catalog Number: 9299
• Author: Anderson, R. and J. Mumma.
• Title: Aspinall Studies
• USFW Year: 1999.
• USFW - Doc Type: Annual assessment of Colorado Pikeminnow Larval Production in the Gunnison and Colorado Rivers, Colorado 1992-1996.
• Copyright Material: NO

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LIST OF TABLES

Species composition offish collected at all sites in the Colorado River, 1992 to

1996 .................................................................................... .................................... 10

Species composition offish collected at all sites in the Gunnison River, 1992 to

1996 ........................................................................................................................ 11

Colorado pikeminnow larval drift and catch data for Lorna, Colorado River, 1992

to 1996 .................................................................................................................... 13

Catch and drift estimates for total, native and non-native fish and Colorado
pikeminnow for a standardized 26 day period for Loma, Colorado River, 1992 to

1996 ........................................................................................................................ 14
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Correlation between peak flow, runoff season and drift season flow and abundance
of native, nonnative and Colorado pikeminnow larvae estimated in the drift for the

five study years. ....................................................................................................... 15

Seasonal drift densities for Loma, Westwater and Moab and coefficient of
determination (r2) between the three sites, and summer, fall and spring densities
of Colorado pikeminnow yay seined in backwaters and the r2 between drift and
backwater densities, and over-winter survival estimates based on spring and fall

densities. ......................................................................................................... .........16

Average ofNNC densities (numberll00m3 seined) from the upper (near Moab)
and lower (below Potash mine) stations on the Colorado River (Trammel and

Chart, 1999a).......................................................,............;...................................... 17

Geometric-mean CPE (fish/m2) of NNC (fathead minnow, red shiner and sand
shiner) during fall ISMP sampling in Reach 1 and 2 (McAda et al. 1998), and
NNC drift densities at Loma (Anderson, 1999) and Moab (Trammel and Chart,
1999b) with coefficients of determination between NNC density at Reach 1 and
2, and between backwater and drift sampling in the same reach................................ 18

Median drift date at Loma and size and date of Colorado pikeminnow yay
sampled in backwaters in Moab (Trammel, 1999a) ..................................................19

Loma Station, Colorado River, drift net sampling results for five years, 1992 to

1996 ..................................................................................................................... 35

Middle Station, Colorado River, drift net sampling results for five years, 1992 to

1996 . . . .. . . . .. .. . . . .. . . .. . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . . . .. . . . . . .
. . . .. . . . . . . . .. . . . . . . .. . 36

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