Evaluation and Monitoring of Wild/Natural Steelhead Production, 1995 Annual Report.
- Idaho Department of Fish and Game, Fisheries Research Section, Boise, ID
Several key study streams in the Salmon River and Clearwater River drainages were snorkeled in the summer of 1995. The current Idaho Department of Fish and Game (IDFG) goal is to maintain a parr density at 70% of the rated carrying capacity. All streams snorkeled are considerably below the current goal (6.4% to 54.3% of goal). Weirs were operated in Chamberlain Creek, West Fork Chamberlain Creek, Running Creek, and Rush Creek during the spring adult steelhead Oncorhynchus mykiss spawning migration. An adult steelhead migration barrier was operated in Rapid River. Adult steelhead escapements in all but Rapid River are at critically low levels. An adult salmon 0. sp. weir was operated in Running Creek using a new passive electronic/video counting facility. Five adult chinook salmon 0. fshawyfscha were captured on video as they passed the counting facility. A video record of all resident fish in excess of 10 to 12 in was also obtained. The video system performed adequately in most circumstances. Additional testing and modification will continue during the 1996 salmon spawning migration. An upstream migration barrier was operated in Rapid River during the salmon spawning migration. Four adult male salmon were passed above the barrier; no females were captured or passed above the barrier. Rotary screw traps were operated in Running Creek and Rapid River during the spring and fall to monitor the juvenile steelhead and salmon downstream migration. Migration timing in Running Creek indicates that the majority of smolt size fish moved downstream out of Running Creek in the fall and few smolt size fish left Running Creek in the spring. Migration timing at Rapid River indicates a more equal distribution of the smolt size fish moving downstream out of Rapid River in the spring. Juvenile steelhead were PIT-tagged in Chamberlain Creek, Running Creek and Rapid River during the summer and fall of 1995. Detections at the lower Snake and Columbia rivers from the 1994 tagging indicate a substantial drop in detection rates at successive hydroelectric projects. The majority of PIT tag detections at Lower Granite Dam occurred from April 9-May 25, with the peak detection on May 9.
- Research Organization:
- Bonneville Power Administration (BPA), Portland, OR (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- 1991BP21182
- OSTI ID:
- 885266
- Report Number(s):
- DOE/BP-21182-9; R&D Project: 199107300; TRN: US200616%%480
- Country of Publication:
- United States
- Language:
- English
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