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shiners had consumed all the razorback suckers in the three sympatric treatments.. A similar study was initiated on July 28, 1993 using juvenile razorback sucker (mean 0.092 grjfish) incorporating 300 and 150 razorback suckers. Following termination of the experiment (August 26, 1993) only one razorback sucker remained alive in all three cages, whereas, over 50% of the red shiners in the experiment survived. In an effort to define subadult habitat use of razorback sucker in a flooded bottomland, five subadult razorback sucker (between '178 and 254 rom) were implanted with a radio transmitters and introduced into Old Charley Wash. Four fish were located and habitat data collected on 14 July 1993, but by late August only two fish could be found in the bottomland. Aerial flights indicated at least one transmitter was located near a cormorant rookery. Data collected suggested that fish tended to use the deepest areas of the bottomland. However, it appears that avian predation may be a significant factor affecting survival of fish stocked into natural wetlands. Relative to adult habitat use, seven adult razorback suckers were implanted with radio transmitters (five from razorback bar, one from Echo Park and one from Island Park) and returned to the Green River. Immediately after implantation, all fish traveled downstream for approximately two to three weeks. None of the fish implanted used flooded bottomlands during the spring high water period. However, it is unknown if the stress due to implantation altered behavior during this period. Fish tended to use run and eddy habitats that were fairly deep (usually ~ 2 m). Most fish did not travel long distances. Fish implanted at razorback bar tended to move upstream, while the two fish implanted above split Mountain Canyon tended to move downstream. Of interest was that no adults traveled lower than RMI 270. This pattern may suggest that fish captured in spawning condition at the mouth of the Duchesne River represent a locally spawning population. The current database indicates that fish captured in the Duchesne River area have also' been collected at the Escalanate razorback bar area. This information, together with the tagging data collected during the last two years may suggest a single spawning population in the middle Green River. X. status of data submission (where applicable): All appropriate data will be submitted to the database manager. XI. FY 93 Budget: A. Funds Provided: $37,000 B. Funds Expended: $37.,000 XII. Recommendations: Telemetry data indicates the possibility that another spawning 3