Final thermal preferendum for the razorback sucker Xyrauchen texanus, a rare endemic species of the Colorado River basin, was estimated to lie between 22.9 and 24.8 C based on electronic-shuttlebox studies. Estimates of upper and lower avoidance temperature ranged from 27.4 to 31.6 C and from 8.0 to 14.7 C, respectively. Lower, but not upper, avoidance temperature was positively correlated with acclimation temperature. Results indicated that new water-control structures on the upper Colorado River drainage should be designed to provide summer water temperatures between 22 and 25 C if preservation of habitat for this species is a consideration.
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