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isopropyl alcohol. Immediately following implantation of the PIT tag, tag presence and code identity were confirmed for all tagged fish. PIT tags used were 400 Khz, glass-encapsulated units (11 mm long by 2.1 mm in diameter; weight < 0.05 g). The presence and code identity were confirmed using a portable, hand- held, battery-powered interrogator (Destron/Identification Devices, Inc. [IDI] model HS-0035-01 J). V. I. Taas. V. I. tags were implanted with a syringe-style injector in both Colorado squawfish and bonytail in the cranial region; razorback sucker were implanted in the post-opercular area. Selection of target sites was based on preliminary implantation of V. I. tags in fresh frozen Colorado squawfish, bonytail, and razorback sucker (200 mm FL). The tag was implanted in transparent subdermal tissue. The V. I. tag used in this study was made from polyester and diazo film, 0.08-0.18 mm thick, 0.6-1.3 mm wide, and 1.5-4.0 mm long imprinted with a unique, sequential, three-character unique alphanumeric code. Carlin-Dangler Tag. Carlin-dangler tags were attached to only razorback sucker and bonytail. A 0.24 cm X 0.64 cm elliptically-shaped plastic disk was selected because this size closely approximated tags that had been used in the field. Tags were tied to polyethylene thread as recommended by H. M. Tyus (pers. comm.). Tags were attached to the fish with leather glover needles (No. 1) at the posterior base of the dorsal fin, similar to the location used in the field with wild fish. Acrylic Dye. Each of the three species were marked with acrylic dye. Two colors (black and red) of water-based tattoo ink were externally applied to each fish between the origin of the pectoral fin base and mid-ventral line, red on the right side and black on the left side. Dye was applied to the respective area with a cotton swab. A 28-gauge hypodermic needle was used to "stencil" the dye 9