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I LIST OF TABLES 1 Table Page 1 1 1 I 1. Numbers of adult Colorado squawfish caught from the upper Colorado River during standardized surveys, 1979-81 ......................................................... 9 2. Electrofishing catch per effort for Colorado squawfish in the lower 2.2-mile reach of the Gunnison River, 1987 and 1988 ................................................... 12 3. Definitions of habitat types .................................... 76 4. Electrofishing catch per effort for Colorado squawfish and razorback sucker in three contiguous river reaches during spring, 1986, 1987 and 1988 .............................. 77 5. Summary data for Colorado squawfish and razorback sucker caught or seen while electrofishing and trammel netting during 1986, 1987 and 1988 in the Grand Valley, Colorado ........ 78 6. Data for larval Colorado squawfish collected in 1986, 1987 and 1988 ................................................... 80 7. Catch rates of fish species collected during young-of- the-year sampling in two adjacent Colorado River reaches, 1986 ............................................................ 81 8. Data for young-of-the-year Colorado squawfish collected from the Colorado River on 1 October 1986, 23 September 1987 and 20 September 1988 ...................................... 82 9. Catch rates of fish species collected during young-of- the-year sampling in two adjacent Colorado River reaches, 1987 ............................................................ 83 10. Catch rates of fish species collected during young-of- the-year sampling in two adjacent Colorado River reaches, 1988 ............................................................ 83 11. Percent species composition of larval samples collected between 16 July and 28 August 1986, 13 July and 28 August 1987 and between 5 July and 10 August 1988, and pooled within three adjacent river reaches ............................. 85 v