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recognizable; a tag, if numbered, must have been both recognizable and readable. <br />Tag presence and code identity (individual ten-digit, alpha-numeric code) were <br />confirmed for all PIT-tagged fish following weighing and measuring with the IDI <br />interrogator. <br />All PIT-tagged and Carlin-tagged fish were examined to note any swelling <br />or infection at or near the insertion or attachment point. A three-point scale <br />(modified from Prentice et al. 1987; see Tables 1 and 4) was used to indicate the <br />degree to which the wound caused by the hypodermic needle had healed. After <br />examination, the fish were returned to their original holding site. <br />Fish that either died during the course of the study or were intentionally <br />sacrificed at the termination of the study were examined and the tissue response <br />and position of the tag relative to internal organs and other tissue recorded. <br />If available, five fish from each tag group were sacrificed at the termination <br />of-the study. <br />Hotchkiss NFH <br />Culture, Ta in and Monitorin4 <br />In July 1989, 75 hatchery-reared, juvenile (mean FL=125 mm; SD=7.4; <br />range=110-150 mm} Colorado squawfish were transported by fish distribution tank <br />supplied with oxygen and air agitation units from Utah State University, Logan, <br />Utah to Hotchkiss NFH. A 0.5~ salt solution was added to the distribution tank <br />to reduce stress during handling and transport. At Hotchkiss NFH, fish were held <br />in a circular tank (2.4 m diameter and 0.51 m deep, capacity: 2,275 L). Fish <br />were provided with a 19 to 38 lpm supply of 15° C ground water throughout the <br />study. <br />Commercially-prepared (Silvercup Salmon Diet size No. 4) dry pellets were <br />supplemented with naturally-grown amphipods (Gammarus spp.). Frequency of <br />11 <br />