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<br />MARKING RAZORBACK SUCKERS AND COLORADO SQUAWFISH
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<br />of nearly 100% after 4 months for implants in
<br />juvenile and adult salmonids on the top of the head
<br />and in adipose tissue behind the eye, adipose fin,
<br />dorsal fin, pectoral fin, and caudal fin.
<br />This study demonstrated that freeze branding
<br />had excellent retention for 15 months for both ra-
<br />zorback suckers and Colorado squawfish and could
<br />easily substitute for the use of PIT tags for the first
<br />two growing seasons. Elastomer implants, al-
<br />though acceptable for short time periods (red and
<br />orange) on Colorado squawfish, were not suitable
<br />for marking fish in excess of 12 months.
<br />
<br />.
<br />
<br />Acknowledgments
<br />
<br />Colorado squawfish used in this study were pro-
<br />vided by the Dexter (New Mexico) National Fish
<br />Hatchery and Technology Center. This study was
<br />conducted at the Ouray (Utah) National Fish
<br />Hatchery. We thank R. Nichols, C. Kaczmarek, T.
<br />Pruitt, and T. Hatch for their assistance in marking,
<br />handling, and culturing the fish; T. A. Burke, G.
<br />Carmichael, and J. H. Williamson reviewed the
<br />manuscript and provided many helpful sugges-
<br />tions. The study was funded by the Recovery Im-
<br />plementation Program for Endangered Fish Spe-
<br />cies in the Upper Colorado River Basin. The Re-
<br />covery Program is a joint effort of the U.S. Fish
<br />and Wildlife Service; U.S. Bureau of Reclamation;
<br />Western Area Power Administration; the states of
<br />Colorado, Utah, and Wyoming; upper Colorado
<br />River basin water users; and environmental or-
<br />ganizations.
<br />
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<br />
<br />Received August 25, 1997
<br />Accepted February 10, 1998
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