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<br />10 <br /> <br />In 1992, 30 seine samples were collected from 15 backwater habitats in the <br />same reach. These samples have yet to be processed. <br /> <br />Spring electrofishing <br /> <br />Numbers of adult Colorado squawfish collected in the three Colorado rivers <br />confirmed the fluctuating trend established from 1986 to 1990. Above average <br />catches were observed for both the Yampa and Colorado rivers in 1991, followed by <br />much lower numbers caught in 1992 (Table 1). The pattern in the White River was <br />opposite. These patterns were also reflected in the catch rates. Considering <br />the small numbers of fish sampled, no remarkable change was noted in the size <br />range. The numbers of adult fish captured or observed in the Yampa River from <br />1986 to 1992 demonstrate a fluctuating pattern with no discernab1e trend over the <br />6-year period (Fig. 3). The patterns for both the White and Colorado rivers <br />suggest increasing trends. Comparison of length ranges for 1992 samples with <br />length frequency distributions for each river from 1986 to 1991 in McAda (1991) <br />do not indicate any trends toward loss of larger, and presumably older, fish, or <br />the influx of smaller, and presumably younger, fish. <br /> <br />Table 1. Colorado squawfish captured or observed during standardized spring <br />electrofishing in Colorado in 1991 and 1992. <br /> <br />RIVER YEAR OBSERVED CAPTURED LENGTHSl C/F2 <br />Yampa 1991 4 13 463 - 674 0.92 <br /> 1992 1 6 548 - 635 0.35 <br />White 1991 1 5 532 - 636 1.10 <br /> 1992 3 11 527 - 765 2.32 <br />Colorado 1991 1 7 448 - 903 0.86 <br /> 1992 2 3 425 - 635 0.42 <br />Len ths = mm lL- <br /> <br />g <br />2 C/F = (total number of fish captured and observed)/tota1 hours <br />of electrofishing <br />