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1 <br />1 <br />1 <br />Li <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br /> <br />t <br />1 <br />1 <br /> <br />I <br /> <br /> <br />three gravel-pit ponds adjacent to the Colorado River and one golf-course pond in the <br />Grand Valley near Grand Junction. This constituted the field portion of the study. It <br />was acknowledged that these sites were less desirable because of the 1) many <br />uncontrollable variables and uncertainties associated with pond environments, <br />2) uncertainty of the condition or fate of fish not recaptured, and 3) increased effort and <br />manpower required to capture fish during monitoring. However, the rationale for <br />incorporating these sites into the study was to increase the probability of success and <br />likelihood that some useful information would be obtained. Also, ponds might provide <br />more natural conditions than would a hatchery, particularly for wild roundtail chub. <br />Some juvenile-size Colorado squawfish and razorback sucker previously stocked into two <br />other ponds, that were part of ongoing grow-out pond studies (Osmundson and Kaeding <br />1989), were available for our use. <br />In 1989, two different lots of hatchery-reared, juvenile (120-165 mm total length <br />[TL]) Colorado squawfish were obtained from Utah State and Colorado State <br />Universities, fish left over from other studies. This constituted the laboratory portion of <br />the study. <br />Personnel from the Grand Junction CRFP office assisted Dexter NFH personnel <br />with PIT tagging 527 young-of-the-year (260 mm TL) and adult razorback sucker in <br />September 1989. Following tagging, fish were placed back into ponds at Dexter NFH. <br />Fish Collections. Transport, and Culture <br />Adult-size (approximately 260-435 mm TL) roundtail chub were randomly <br />collected from the Colorado and Gunnison rivers near Grand Junction by boat-boom <br />6 <br />