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feeding with amphipods was twice weekly and was increased to about four times weekly at the termination of the study. Fish were allowed to acclimate two weeks following transport before fin removal and PIT-tag implantation. One experimental group and one control group were established. Prior to tagging, each fish in the experimental and control groups received a pelvic fin clip to distinguish them from the other group. Fish were PIT tagged in the body cavity. Fish were examined at day 70, 223, 343, and 387 following initial tag implantation to verify the PIT tag in the experimental group, judge wound healing, and record growth data from the experimental and control group. At the termination of the study, all PIT-tagged fish were sacrificed, the PIT tag retrieved, and the tissue response and position of the tag relative to internal organs and other tissue examined. Ouray EFH Cu tur TaQain4, and Monitorin4 Age-0 razorback sucker (mean FL=92; SD=3.2; range=75-100 mm) artificially spawned from wild adult fish from the Green River were implanted with PIT tags in the body cavity. Between November 1989 and August 1990 fish were held indoors in a 1.2 m diameter metal circular tank. Fish were provided with a constant supply of ground water at a temperature of 13° C, and fed Silvercup Trout Diet with double vitamin pack at 3% of body weight per day. The PIT-tag experiment at Ouray consisted of three groups of 40 juvenile razorback sucker each. One group was PIT tagged in the body cavity. A secondary mark (either the right or left pelvic fin was removed) was applied at the time of tag implantation to identify the PIT-tagged group from the second group that 12