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<br />Canyon (R. Valdez, BioWest Inc, Logan, UT, personal conununication). Recruinnent appears weak <br />on very high and low flow years and relatively good on years of long-term average flows. <br /> <br />, . <br /> <br />R <br />~ .20 <br />"- <br />:r: <br />(I) 85 <br />u: <br />- .15 <br />w I I <br />" <br />0 <br />z .10 <br /><( 87 <br />w <br />:E 88 I <br />. <br />0 .05 83 <br />~ II I 84 <br />l- I <br />w <br />:E 0 82 <br />0 <br />w <br /><D <br /> 10 20 30 40 .50 60 70 80 <br /> MAXIMUM-ANNUAL DISCHARGE (CFS X 1000) <br /> <br /> <br /> <br /> <br />Figure 4. Catch per effort of post larval squawfish as related to maximum annual discharge for the <br />Colorado River. Data are geometric means :I: 1 standard error for fish collected in backwaters <br />using standardized sampling protocol (U.S. Fish & Wildlife Service 1987b) during October <br />between the Westwater Canyon (mile 110) and confluence with the Green River (mile 0). Thus, the <br />data are a relative measure of recruitment from spawning that OCCWTed during the high flow periods <br />each year (from McAda and Kaeding 1989, also included in Osmundson and Kaeding 1991). Data <br />collected in 1989 - 1991, which were low to average water years, are consistent with this relationship <br />(C. McAda, U.S. Fish and Wildlife Service, Grand Junction, CO, unpublished data). <br /> <br />15 <br />