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<br />Table 15. <br /> <br />Abundance estimates of humpback chub ~ 150 mm by year and <br />month; Little Colorado River. <br /> <br /> 95% Confidence Interval <br />Date Abundance Estimate SE Lower Upper Reach (rkm) Size (mm) # per km <br />Sep-91 1,771 300 1,296 2,492 0-13,6 >= 150mm 130 <br />October 1991 2,038 518 1,276 3,368 0-13,6 >= 150 mm 150 <br />November 1991 1,989 489 1,264 3,235 o - 13,6 >= 150 mm 146 <br />Sep-92 1,950 1,381 598 6,908 0-13,6 >= 150 mm 143 <br />October 1992 1,099 60 990 1,224 0-13,6 >= 150 mm 81 <br />November 1992 1,417 408 839 2,500 0-13,6 >= 150 mm 104 <br />October/November 2000 1,590 297 992 2,552 0-13,6 >= 135 mm 117 <br />OctoberlNovember 2001 1,064 33 999 1,129 0- 13,6 >= 150 mm 78 <br />October/N~ber2002 2,774 209 2,364 3,184 0-13,6 >= 150 mm 204 <br />September/October 2003 1,862 206 1,459 2,265 0-13,6 >= 150 mm 137 <br />September/October 2004 2,565 519 1,548 3,582 o - 13,6 >= 150 mm 189 <br /> <br />1991 and 1992 estimates are from Douglas and Marsh (1996); 2000 estimate is from Coggins <br />and Van Haverbeke (2001); 2001 estimate is from Van Haverbeke and Coggins (2002); 2002 <br />estimate is from Van Haverbeke (2003); 2003 estimate is from Van Haverbeke (2004). <br /> <br />49 <br />