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Stewart Lake outlet (RK 482), and 52 at the Old Charley Wash outlet (RK 401.5) and the mouth of the Duchesne River (RK 399). Riverine telemetry Adult razorback sucker implanted with radio transmitters in 1993 showed spring movement patterns similar to those observed from tagging data. Following implantation at spawning areas in 1993, five of the seven fish established locations downstream of the spawning area for at least two months (Figure 4). The maximum distance traveled downstream during the 12 months following transmitter implantation in 1993-94 ranged between 0.0 and 60.4 km, averaging 22.1 km (SD = 21.7 km) (Table 1). Maximum upstream movement during the same period ranged between 0.0 and 32.2 km, averaging 18.5 (SD 14.0 km). In May and June, at least three individuals were found in the vicinity of Ashley Creek (RK 481). In late July, 1993, one adult razorback sucker died approximately two months following implantation. By mid July, four of six surviving razorback sucker, including the one implanted at the Yampa River spawning bar, established positions within Split Mountain Canyon (RK 526-513). The remaining two fish later moved into Split Mountain Canyon in September. The fish that was implanted at the Yampa River spawning site moved back to that area in September, but returned to Split Mountain Canyon (located there again in February, 1994). In 1994, two of the six study fish moved to spawning sites other than where they were captured the previous year. Fish 40.140 was collected on the Yampa River spawning bar in 1993, but moved to the Escalante spawning area in 1994 (Appendix 1). The fish collected at the Island Park site in 1993 also moved to the Escalante spawning area (RK 501) in 1994. Four of the six study fish were observed in the vicinity of the lower Island Park site in 1994, being found between RK 526 and RK 531 during 20 April- 24 May. In 1994 fish 40.110 was found at the Island Park site, RK 531, on 13 May and was not located at either of the other spawning areas during spring. With the exception of 40.110, all fish collected from the Escalante spawning area bar during 1993 returned to this area in May, 1994. Following spawning in 1994, four individuals moved downstream and two moved upstream during the postspawning period. Maximum movement downstream during the 12 month period ranged from 4.8 to 112.7 km, averaging 61.8 km (SD = 59.9 km). Three fish made long downstream movements ranging from 93.3 to 112.7 km. Maximum postspawning movement upstream during the second year ranged from 0.0 to 45.9 km. As in 1993, most fish returned to Split Mountain Canyon sometime during the summer of 1994. By late September, all fish remained in Split Mountain Canyon with the exception of one individual who moved to the upper reach of the Escalante spawning area. In September, two fish returned to spawning sites where they were originally collected in 1993 (Yampa River and Escalante spawning areas). Fish 40.140 and 40.059 returned sometime prior to March. In March, 1995 all fish were located within a 19.3-km reach of the river between Island Park (RK 534) and the Escalante spawning area (RK 492-501). Only one fish remained in Split Mountain Canyon in March, although one fish was only 1.6 km upstream and another 3.2 km downstream of the Canyon. 15