Accession Number : ADA323314

Title :   Migration of Adult Chinook Salmon and Steelhead Past Dams and through Reservoirs in the Lower Snake River and into Tributaries - 1991.

Descriptive Note : Annual rept.,

Corporate Author : IDAHO UNIV MOSCOW DEPT OF FISH AND WILDLIFE RESOURCES

Personal Author(s) : Bjomn, T. C. ; Ringe, R. R. ; Tolotti, K. R. ; Keniry, P. J. ; Hunt, J. P.

PDF Url : ADA323314

Report Date : NOV 1992

Pagination or Media Count : 105

Abstract : A study of the upstream migration of adult spring and summer chinook salmon Oncorhynchus tshawytscha and steel head O, mykiss past the four lower Snake River dams, through the reservoirs, and into the tributaries of the Snake River drainage was initiated in 1991. The objectives were to evaluate the effect of spill, powerhouse operation, and flows on the rates of passage at the dams, migration through the reservoirs, fishway entrances used, fallback at the dams, and movements into the tributaries upstream from the reservoirs. Transmitters were placed in 531 spring and summer chinook salmon and 728 steel head and the fish were then released near Ice Harbor Dam and monitored as they continued their migration to assess migration rates and success. Sphagetti-loop and metal jaw tags were placed on 1,976 steel head released near Ice Harbor Dam during four periods of normal or zero flow at night from the three upper dams to assess the effect of reduced flow at night on migration. Electronic tunnels were installed in or near each fishway entrance at the two upper dams to assess use and fallout. A section of fence was installed near the north powerhouse entrances at the two upper dams to determine if fallout would be reduced from that observed in earlier years.

Descriptors :   *MIGRATION, *FISHES, *STREAMS, *RESERVOIRS, *DAMS, ELECTRONICS, METALS, STEEL, TUNNELS, DRAINAGE, ICE, NIGHT, FLOW, HARBORS, ADULTS, SUMMER, FALLOUT, SPRINGS, FENCES.

Subject Categories : Biology
      Hydrology, Limnology and Potamology
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE