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<br />. <br /> <br />xiii <br /> <br />. <br /> <br />ABSTRACT <br /> <br />Life History and Ecology of the Colorado Squawfish <br />(Ptychocheilus lucius) in the Upper <br /> <br />. <br /> <br />Colorado River Basin <br /> <br />by <br /> <br />Karl Seethaler, Master of Science <br /> <br />. <br /> <br />Utah State University, 1978 <br /> <br />Major Professor: Dr. Richard S. Wydoski <br />Department: Wildlife Science <br /> <br />. <br /> <br />. <br /> <br />The Colorado squawfish (Ptychocheilus lucius) was once abundant <br />throughout the Colorado River system; it is now an endangered species <br />found in small numbers only in limited portions of the upper basin. The <br />major cause of this decline is attributed to man-made alterations of the <br /> <br />river environment. <br /> <br />The Endangered Species Act of 1973 was enacted in response to <br /> <br />. <br /> <br />increased public concern for vanishing native wildlife, although the <br />rationale for the preservation of species is not yet universally under- <br /> <br />. <br /> <br />stood. Federal and state agencies charged with the management of en- <br />dangered species and their environments found that they needed to gather <br /> <br />cons~derable information on such endangered species as the Colorado <br /> <br />. <br /> <br />squawfish. <br /> <br />This work constitutes a broad synthesis of current knowledge about <br /> <br />the Colorado squawfish: distribution, abundance, habitat requirements, <br /> <br />. <br /> <br />systematics, reproduction, early life development, age and growth, food <br /> <br />habits, movement, maturity, diseases and parasites, causes of decline, <br /> <br />. <br />