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Fish

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Evaluating the Role of Wetlands to Endangered Salmonids at Toppenish and Tualatin River National Wildlife Refuge

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

wfrc.usgs.gov — Threatened and endangered salmonids in the Pacific Northwest often use backwaters and wetlands as they migrate toward the ocean, however our understanding of the role of wetlands to juvenile salmonids is limited. The major Objective of this study was to determine whether juvenile steelhead were being tapped on the wetland during spring, and More...

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Estuary Utilization by Juvenile Chinook Salmon

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

wfrc.usgs.gov — Little is known about the importance of estuarine habitats for juvenile chinook salmon (Oncorhynchus tshawytscha), hence managers are uncertain of the appropriate levels of protection for such habitats. Research to determine the length of residence and growth of juvenile chinook salmon in the Skagit River estuary will indicate the importance of More...

  • Tidal channels in the estuarine emergent marsh provide food and habitat for juvenile chinook salmon.

Investigating Passage of ESA-listed Juvenile Fall Chinook Salmon at Lower Granite Dam During Winter When the Fish Bypass System is Not Operated

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

wfrc.usgs.gov — Fall chinook salmon (Oncorhynchus tshawytscha) in the Snake River are currently listed as threatened under the Endangered Species Act (ESA). Although fish bypass systems reduce the mortality of fish entering turbine intakes at mainstem hydroelectric dams, they are only operated during the spring, summer, and early fall during the peaks of seaward More...

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Genetic Analysis of Salmonids and Other Fishes in the Western US

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

wfrc.usgs.gov — As salmonid populations continue to decline in the western US, it is imperative to develop a better understanding of ecological, genetic, and biological aspects of these species. Within the broad context of the Fisheries and Aquatic Resources Program the 5-year research goals address: development of non-lethal genetic procedures for identification More...

  • Bridgecreek, a tributary of the Stehekin river.

Post-release Behavior and Survival of Hatchery and Natural Juvenile Fall Chinook Salmon

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

wfrc.usgs.gov — Fall chinook salmon (Oncorhynchus tshawytscha) in the Snake River are currently listed as threatened under the Endangered Species Act (ESA). Because fall chinook salmon migrate seaward during the summer when flows are low and water temperatures are high, their survival rate is lower. The goal of this study is to more clearly identify the More...

  • Image of scientist surgically implanting a radio tag.