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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />il <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Defining and measuring recruitment at smaller fish sizes was possible for <br />Westwater Canyon (220 mm) and the LC-Grand Canyon (150mm) based on <br />existing data. It is not presumed or even understood if these sampling differences <br />in length frequency distribution represent biological differences between the Black <br />Rocks, Westwater and LC-Grand Canyon populations. The only differences <br />between down listing and delisting criteria for recruitment and population structure <br />are an increase in recruitment rate from 10 to 15% for the Yampa, Cataract, and <br />Deso-Gray populations. <br /> <br />Figure 10. Length frequency distributions for humpback chub in Slack Rocks, 1991-97. <br /> <br />8 la c k Roc k s -C 0 10 ra d 0 R iv e r <br /> <br />11.111991 I <br /> <br />en <br />o <br />Z <br /> <br />11.1119941 <br /> <br />III <br />o <br />Z <br /> <br />20 <br /> <br /> <br />1 5 <br /> <br />1 0 <br /> <br />5 <br /> <br />o <br /> <br />25 <br /> <br /> <br />20 <br /> <br />1 5 <br /> <br />1 0 <br /> <br />5 <br /> <br />o <br /> <br /> 25 <br /> 20 <br />Im19971 en 1 5 <br />0 <br />z 1 0 <br /> 5 <br /> 0 <br /> <200 240 <br /> <br /> <br />280 320 360 400 <br />Length (m m <br /> <br />29 <br />