Accession Number : ADA323307

Title :   Migration of Adult Chinook Salmon and Steelhead Past Dams and Through Reservoirs in the Lower Snake River and into Tributaries - 1993.

Descriptive Note : Annual rept.,

Corporate Author : CORPS OF ENGINEERS WALLA WALLA WA WALLA WALLA DISTRICT

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

PDF Url : ADA323307

Report Date : MAR 1995

Pagination or Media Count : 237

Abstract : A study of the upstream migration of adult spring and summer chinook salmon Oncorhynchus tshawytscha and steel head 0. mykiss past the four lower Snake River dams, through the reservoirs, and into the tributaries of the Snake River drainage was initiated in 1991 and continued in 1992 and 1993. The objectives were to evaluate the effect of spill, powerhouse operation, and flows on the rates of passage of the fish at the dams, migration through the reservoirs, the fishway entrances used, fallback at the dams, and movements into the tributaries upstream from the reservoirs. In 1993, 1,171 spring and summer chinook salmon and 884 steel head were trapped and released with transmitters in the south shore ladder at John Day Dam and monitored as they continued their migration to the spawning areas or hatcheries in the Snake River basin to assess migration rates and success. Spaghetti-loop and VI (visual implant) tags were placed on 1,994 steel head trapped at Ice Harbor Dam and released upstream from Ice Harbor Dam during four periods of normal or zero flows at night from the three upper dams to assess the effect of reduced flow at night on migration.

Descriptors :   *RIVERS, *SNAKES, *FISHES, *DAMS, DRAINAGE, ICE, DAY, MIGRATION, NIGHT, FLOW, VISION, HARBORS, BASINS(GEOGRAPHIC), SOUTH(DIRECTION), ADULTS, SUMMER, STREAMS, RESERVOIRS, SHORES, SPRINGS.

Subject Categories : Biology
      Ecology
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE