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Post-release attributes and survival of hatchery and natural fall chinook salmon in the Snake River; annual report 1999.

DE2001776672

Publication Date	2001
Personal Author	Tiffan, K. F.; Rondorf, D. W.
Page Count	140
Abstract	This report summarizes results of research activities conducted in 1999 and years previous. In an effort to provide this information to a wider audience, the individual chapters in this report have been submitted as manuscripts to peer-reviewed journals. These chapters communicate significant findings that will aid in the management and recovery of fall chinook salmon in the Columbia River Basin. Abundance and timing of seaward migration of Snake River fall chinook salmon was indexed using passage data collected at Lower Granite Dam for five years. We used genetic analyses to determine the lineage of fish recaptured at Lower Granite Dam that had been previously PIT tagged. We then used discriminant analysis to determine run membership of PIT-tagged smolts that were not recaptured to enable us to calculate annual run composition and to compared early life history attributes of wild subyearling fall and spring chinook salmon. Because spring chinook salmon made up from 15.1 to 44.4% of the tagged subyearling smolts that were detected passing Lower Granite Dam, subyearling passage data at Lower Granite Dam can only be used to index fall chinook salmon smolt abundance and passage timing if genetic samples are taken to identify run membership of smolts. Otherwise, fall chinook salmon smolt abundance would be overestimated and timing of fall chinook salmon smolt passage would appear to be earlier and more protracted than is the case.
Keywords	Fisheries Salmon Abundance Columbia river basin Genetics Granites Management Rivers Snake River
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125

Post-release attributes and survival of hatchery and natural fall chinook salmon in the Snake River; annual report 1999.

Post-release attributes and survival of hatchery and natural fall chinook salmon in the Snake River; annual report 1999.
DE2001776672

Publication Date	2001
Personal Author	Tiffan, K. F.; Rondorf, D. W.
Page Count	140
Abstract	This report summarizes results of research activities conducted in 1999 and years previous. In an effort to provide this information to a wider audience, the individual chapters in this report have been submitted as manuscripts to peer-reviewed journals. These chapters communicate significant findings that will aid in the management and recovery of fall chinook salmon in the Columbia River Basin. Abundance and timing of seaward migration of Snake River fall chinook salmon was indexed using passage data collected at Lower Granite Dam for five years. We used genetic analyses to determine the lineage of fish recaptured at Lower Granite Dam that had been previously PIT tagged. We then used discriminant analysis to determine run membership of PIT-tagged smolts that were not recaptured to enable us to calculate annual run composition and to compared early life history attributes of wild subyearling fall and spring chinook salmon. Because spring chinook salmon made up from 15.1 to 44.4% of the tagged subyearling smolts that were detected passing Lower Granite Dam, subyearling passage data at Lower Granite Dam can only be used to index fall chinook salmon smolt abundance and passage timing if genetic samples are taken to identify run membership of smolts. Otherwise, fall chinook salmon smolt abundance would be overestimated and timing of fall chinook salmon smolt passage would appear to be earlier and more protracted than is the case.
Keywords	Fisheries Salmon Abundance Columbia river basin Genetics Granites Management Rivers Snake River
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125