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7/14/2009 5:02:31 PM
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5/20/2009 10:09:19 AM
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UCREFRP
UCREFRP Catalog Number
7834
Author
Burdick, B. D. a. R. B. B.
Title
Experimental Stocking Of Adult Razorback Sucker In The Upper Colorado And Gunnison Rivers.
USFW Year
1997.
USFW - Doc Type
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itively identified have been collected from the Upper Colorado River Basin. <br />Smith (1959) reported two juvenile razorback suckers from Glen Canyon during a <br />preimpoundment study. Taba et al. (1965) collected eight juvenile razorback <br />suckers from a Colorado River backwater downstream from Moab, Utah. In 1991, two <br />juvenile razorback suckers were collected from the lower Green River (Gutermuth <br />et al. 1994). <br />Background <br />So few adult riverine fish remain in the wild that it is unlikely that a <br />population can be restored through natural reproduction. As a consequence, the <br />Biology Committee has placed a high priority on reestablishing razorback sucker <br />in the Upper Colorado and Gunnison rivers. Augmenting or restoring populations <br />by stocking endangered fishes has been identified as one of the five elements for <br />recovery of endangered fishes in the upper basin. A plan to evaluate stocking <br />to augment or restore razorback sucker in the Upper Colorado River (Burdick 1992) <br />was accepted by Recovery Program participants. That plan addressed the essential <br />elements for an experimental stocking program to obtain fundamental information <br />on the ecology of razorback sucker and to determine the feasibility of stocking <br />as a recovery tool. The plan discussed the rationale and justification for the <br />experimental stocking of adult fish, the genetic risks associated with <br />experimental stocking, justification for selection of stocking areas, and the <br />protocol and criteria to investigate the relation between size at stocking and <br />survival and time of stocking. The plan also outlined research efforts and <br />general procedures to monitor stocked fish and evaluate the stocking program. <br />Because too few ri veri ne razorback sucker exist in the Upper Colorado River <br />with which to conduct scientific studies or to sustain populations, stocking a <br />few adult hatchery- or pond-reared fish would provide information to understand <br />the ecology of wild razorback sucker in the river environment and evaluate the <br />utility of stocking on a larger scale. Research with hatchery- or pond-reared <br />fish may also provide a method to determine their habitat needs and biological <br />interactions and thus eventually provide a mechanism to enhance their recovery. <br />The factors affecting survival of razorback sucker in the riverine system must <br />be determined before large-scale augmentation or re-introduction stocking can be <br />expected to be successful. Experimental stocking of razorback sucker may discern <br />whether factors such as competition, predation, imprinting, homing, survival, <br />etc., are critical to their survival. More could be learned about distribution, <br />movement, reproduction, recruitment, and growth following experimental stocking. <br />This information would guide future stocking activities to augment existing <br />populations or to restore extirpated ones. <br />Purpose and Objectives <br />The purpose of this study was to evaluate the survival and performance of <br />pond-reared, radiotagged adult razorback sucker following stocking in the Upper <br />Colorado and Gunnison rivers. This study was intended to answer specific <br />research questions essential for recovery, and evaluate the utility of stocking <br />sub-adult and adult-size, hatchery-produced fish in achieving recovery goals. <br />Specific objectives were to: <br />2
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