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28-Jul <br />18-Jul <br />08-Jul <br />~ 28-Jun <br />c~ <br />0 18-Jun <br />08-Jun <br />29-May <br />19-May <br />r - 0.97 --------- - <br />---------- --- - <br />----- <br />------------------------ ------ <br />------------------- <br />• <br />• <br />• <br />2300 <br />2200 <br />2100 ~ <br />co <br />2000 ~ <br />1900 ~ <br />rn <br />1800 O <br />1700 <br />1600 <br />200 400 600 800 1000 1200 <br />Avg June Flow (m3/sec) <br />~ Onset of spawn • Date of 18 C <br />~ DD to spawn -e-- regress flow to spawn date <br />Figure 10. Relationship of average June flow with dates of the onset of Colorado pikeminnow <br />spawning, and date the Colorado River reached 18°C, from 1992-1996. <br />43 <br />