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<br />t <br /> <br />7 <br /> <br />1 <br />t <br /> <br />1 <br /> <br /> <br /> <br />The location of the tag was consistent with the area of insertion for all fish species <br />in both test groups. Insertion of the needle and tag through the abdominal musculature <br />elicited an initial inflammatory response with little or no hemorrhage. At the <br />termination of the study, subjective examination revealed that PIT tags inserted either in <br />the body cavity or dorsal musculature did not migrate substantially. For fish tagged in <br />the body cavity, the tag was found imbedded in the posterior area of the pyloric caeca or <br />in the adipose tissue adjacent to the pyloric caeca. The tag was imbedded in the dorsal <br />musculature no more than 5 mm from the insertion point. In both test groups, no <br />swelling or edema was noted near the tag. These histological results were consistent <br />with those noted for Pacific salmon (cf. Prentice et al. 1985). Therefore, from the initial <br />tests performed, it appears that PIT tags are biologically compatible with the fish tested. <br />Winter Water uali <br />Dissolved oxygen was adequate in all ponds during January 1989 (Table 3). <br />However, dissolved oxygen deteriorated in February in two ponds. The lowest <br />dissolved oxygen levels were detected on 9 February in Gardner Pond (3 mg/1) and 9 <br />and 24 February in Humphrey Pond (2 mg/1). Levels in 13th-hole and West ponds were <br />adequate throughout the period monitored. <br />Some winterkill had been observed at West Pond in 1988 (Osmundson and <br />Kaeding 1989), when approximately 25 dead or dying Colorado squawfish were noted <br />following ice-out. Relatively high levels of hydrogen sulfide were also detected at this <br />time. Fish were necropsied and found to harbor Asian tapeworms. Although hydrogen <br />20 <br />