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<br />Table 1. Summary of closed population abundance estimates for the Little Colorado River population of humpback chub. <br /> <br />AUTHOR LOCATION DATE FISH ABUNDANCE METHOD COMMENTS <br /> SIZE ESTIMATE <br />Kaeding and LCR Inflow' and LCR. 1980-1981 >200 mm 7,000-8,000 Schnabel, Modified Schnabel, Authors claim this is a <br />Zimmerman 1982 and Schumacher/Eschmeyer "ballpark" estimate due <br /> to assumption violations. <br />Minckley 1988 LCR confluence (<].2 Ian) May 1987 >]20mm 5,783 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts <br />Kubly 1990 LCR confluence (<1.2 km) May I 987 >]40 mm 1,800 Schnabel Author states estimate is <br /> biased and precision is <br /> poor. <br />Minckley 1988 LCR confluence (<1.2 Ian) May 1988 >120 mm 7,060 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts <br />Kubly 1990 LCR confluence (<1.2 Ian) May 1988 >I40mm 2,900 Schnabel Author states estimate is <br /> biased and precision is <br /> poor. <br />Minckley 1989 LCR(<15km) May 1989 >150 mm ]8,253 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recaoture efforts. <br />Kubly 1990 LCR (<15 Ian) May 1989 >140 mm 5,500-25,000 Schnabel Author states estimate is <br /> (estimate stabilized biased and precision is <br /> near 5,000 fish) ooor. <br />Minckley 1989 LCR confluence (<1.2 Ian) May 1989 >150 rom 10,120 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recaoture efforts. <br /> <br />o <br />o <br />CO <br />(0 <br />CJl <br /> <br />a Kaeding and Zimmerman defined the LCR Inflow Reach as Colorado River miles -51.5-71.5 <br />b Valdez and Ryel 1995 defined the LCR Inflow Reach as Colorado River miles 57-65.4 <br />'Trammell and Valdez 2002 defined the LCR Inflow Reach as Colorado River miles 56.3-68.3 <br /> <br />Draft - Apri I 21, 2003 <br /> <br />14 <br />