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0 <br />1 <br />INTRODUCTION <br />• <br />i <br />0 <br />The Colorado River drainage contains several species of endangered <br />and threatened fishes. Very little information is available on the <br />habitat requirements of these fishes to assist water development agencies <br />in assessing and thereby minimizing the effect of their project(s) on <br />species protected by state and federal endangered species regulations. <br />Habitat factors most likely to be altered by development projects include <br />water temperature and velocity and concentrations of total dissolved <br />solids. <br />Objectives of our study were to 1) determine temperature and total <br />dissolved solids preferences of juvenile and adult Colorado squawfish <br />(Ptychocheilus lucius), humpback chub (Gila cypha), bonytail chub (Gila <br />ele ans), and razorback sucker (Xyrauchen texanus), 2) determine baseline <br />hematological parameters for each species, 3) determine swimming stamina <br />for each species at various water velocities and temperatures, and 4) <br />determine effects of swimming and transport stress on certain blood <br />parameters. <br />0 <br />10 <br />t <br />P