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Factors that influence the downstream migration rates of juvenile salmon and steelhead through the hydroelectric system in the mid-Columbia River basin

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dc.contributor.authorGiorgi, A E
dc.contributor.authorHillman, T W
dc.contributor.authorStevenson, J R
dc.contributor.authorHays, S G
dc.contributor.authorPeven, C M
dc.date2023-09-23T05:04:42.000
dc.date.accessioned2024-04-26T17:20:46Z
dc.date.available2024-04-26T17:20:46Z
dc.date.issued1997
dc.description.abstractWe investigated the extent to which key factors influenced the migration rate of the smolts of Pacific salmon Oncorhynchus spp. through impounded portions of the mid-Columbia River, during the years 1989–1995. Actively migrating chinook salmon O. tshawytscha (oceantype and stream-type forms), sockeye salmon O. nerka, and steelhead O. mykiss were analyzed by bivariate and multiple-regression methods. The dependent variable was the rate (km/d) at which uniquely coded PIT-tagged (passive integrated transponder tags) smolts migrated between Rock Island Dam and McNary Dam. Predictor variables consisted of indices of river discharge volume (flow), water temperature, release date of tagged fish, and fish size. The variable of key interest was flow because water management strategies are in place to increase water velocity through flow augmentation, with the intention of increasing smolt migration rate to decrease smolt mortality. For spring-migrating sockeye salmon, hatchery steelhead, and wild steelhead, flow was the primary predictor variable entering the models, and the bivariate models explained 42, 36 and 31% of the observed variation in migration rate for those species, respectively. Yearling chinook salmon migration rate was not correlated with any variable. Summer-migrating ocean-type chinook salmon showed no response to flow over a broad range of discharge (1,500–5,000 m3/s). However, there was a positive relationship between migration rate and fish length at the time of tagging for oceantype chinook salmon; r 2 in the bivariate model = 0.59. Implications of these findings to water management strategies are discussed.
dc.description.pages268-282
dc.identifier.urihttps://hdl.handle.net/20.500.14394/27330
dc.relation.ispartofNorth American Journal of Fisheries Management
dc.source.issue17
dc.source.statuspublished
dc.subjectchinook
dc.subjectdownstream migration
dc.subjecthatchery
dc.subjecthydroelectric
dc.subjectjuvenile
dc.subjectjuvenile salmon
dc.subjectMcNary Dam
dc.subjectmigration
dc.subjectmodels
dc.subjectmortality
dc.subjectRock Island Dam
dc.subjectsalmon
dc.subjectsmolt
dc.subjectsockeye salmon
dc.subjectsteelhead
dc.subjecttagging
dc.subjecttransponder
dc.subjectwater management
dc.subjectwater velocity
dc.titleFactors that influence the downstream migration rates of juvenile salmon and steelhead through the hydroelectric system in the mid-Columbia River basin
dc.typearticle
dc.typearticle
digcom.contributor.authorGiorgi, A E
digcom.contributor.authorHillman, T W
digcom.contributor.authorStevenson, J R
digcom.contributor.authorHays, S G
digcom.contributor.authorPeven, C M
digcom.identifierfishpassage_journal_articles/216
digcom.identifier.contextkey2446136
digcom.identifier.submissionpathfishpassage_journal_articles/216
dspace.entity.typePublication
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