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Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — The goal of this work is to provide information to aid state, federal, and tribal managers in efforts to protect and restore the white sturgeon (Acipenser transmontanus) in the Columbia River Basin Construction and operation of dams on the Columbia and Snake rivers for hydroelectricity, navigation, and irrigation have adversely affected white More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Pacific lamprey (Lampetra tridentata) populations are in decline or have been extirpated from much of their historical range in the Columbia River Basin. Evidence collected for sea lampreys suggests they may not home to natal streams, but instead may use their olfactory ability to detect the presence of larval and adult lampreys as discrete More...
Publisher: USGS | Science Center: Upper Midwest Environmental Sciences Center (UMESC, LaCrosse) | Format: URL
www.umesc.usgs.gov — In the Upper Mississippi River, more than 80 species of fish use vegetated habitats during some portion of their life cycle. Fish depend on aquatic vegetation for abundant, high-quality food resources (plant-associated invertebrates) and refuge from predators. Vegetation abundance in the Upper Mississippi River substantially declined in the late More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Since 1994, scientists from the Anadromous Fish Ecology Team have been assisting the U.S. Army Corps of Engineers (USACE) in evaluating the migration behavior and passage of juvenile salmon and steelhead through Lower Granite Reservoir and Dam on the Snake River, WA. The goal of this study is to identify the behavior of individual juvenile salmon More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — The Arctic charr (Salvelinus alpinus) in the northern most latitudes migrate to the ocean in the spring to feed and grow. This results in accumulation of polychlorinated biphenyls (PCB) in their visceral fat. During the winter, the charr reside in freshwater lakes and do not feed. They do mobilize lipids from adipose tissue for energy, which More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — The National Marine Fisheries Services Biological Opinion on the Columbia River salmon listed under the Endangered Species Act sets guidelines for salmon recovery, many of which address salmon passage issues at hydroelectric dams operated by the U.S. Army Corps of Engineers (COE), because fish passing via turbines do not survive as well as those More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — As anadromous juvenile salmonids migrate from freshwater rearing habitats to the ocean, they are vulnerable to a host of factors that affect their survival. Direct effects associated with dam passage (e.g., instantaneous mortality, injury, loss of equilibrium, etc.) and indirect effects (e.g., predation, disease, and physiological stress) More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — This research summary reports on the decline of Pacific lampreys (Lampetra tridentata) in the Columbia River Basin. Their numbers have declined to only a remnant of their pre-1940's populations. One factor that could be detrimental to lamprey production is the amount of energy they expend negotiating upstream fish passage facilities at dams. An More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — The goal of this study is to determine egress routes and egress timing of juvenile salmon with respect to passive particle movement in the tailrace of John Day Dam using ultra-sonic fish tracking technology. The objectives are to evaluate egress routes and egress timing of juvenile spring chinook salmon with respect to paired releases of neutrally More...
Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL
fl.biology.usgs.gov — The African jewelfish (Hemichromis letourneuxi) has been established in canals surrounding the Miami area since the 1960s. With changes in water delivery to the park, the species has recently (2000) entered Everglades National Park and expanded its range westward through Big Cypress National Preserve. Simultaneously, African jewelfish from a More...
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...
Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL
fl.biology.usgs.gov — The Nile tilapia (Oreochromis niloticus) is commonly used in aquaculture worldwide. Feral populations exist in many regions where individuals escape culture and establish in natural habitats. In Mississippi, Nile tilapia are established in at least three distinct localities (fig. 1): the lower Pascagoula and Escatawpa river drainages, and a More...
U.S. Department of the Interior |
U.S. Geological Survey