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12 <br />distance from a single receiver by the strength of the signal. <br />Razorback suckers tagged at the mouth of the Yampa River were <br />followed intermittently for a maximum of 2 weeks. Razorback suckers <br />tagged in Walter Walker Wildlife Area were located periodically up to <br />10 months after release. <br />Surgical procedures were similar to those used by Hart and <br />Swanerfett [1975]. Fish were anesthetized using a synergic mixture <br />of MS 222 and quinaldine [Schoetteger and Steuke, 19701. When the <br />fish became quiet, it was removed from the anesthetic and placed on <br />a V-board. A 30 to 40 mm incision was made anterior to the pelvic <br />girdle and left of the median line. The incision was placed to the <br />side of the abdomen so the transmitter would not rest on the stitches <br />[Personal communication, C. D. Ziebell, Arizona Cooperative Fishery <br />Research Unit, Tucson]. The transmitter was placed in 70% ethanol <br />prior to insertion to sterilize the instrument. Ethanol was also <br />used to wash the wound at the completion of the operation and to <br />sterilize the surgical tools. No antibiotic was administered. The <br />wound was then closed using No. 000 surgical silk. This material was <br />dissolved by the fish during healing. The gills were periodically <br />bathed with a dilute anesthetic solution during the 7 to 10 minutes <br />required to complete the operation. <br />Postoperative care consisted of holding the fish until it <br />recovered from the anesthetic. Three fish were held for several days <br />to follow their recovery and observe their ability to swim. To <br />minimize handling stress, all other fish were released as soon as <br />they had fully recovered from the anesthetic and could swim well.