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2008 | Publisher: Other (RSC Publishing, Journal of Environmental Monitoring) | Format: URL
www.rsc.org — Environmental contaminant and biomarker monitoring data from major U.S. river basins were summarized for black bass (Micropterus spp.) and common carp (Cyprinus carpio) sampled over a nine year period. Cumulative frequency distributions revealed taxon differences for many organochlorine residue concentrations, elemental contaminant concentrations, More...
May 4 2007 | Publisher: Other (Springer New York) | Format: URL
www.springerlink.com — This project is an evaluation of three potentially nonlethal alternatives to fillet sampling for the determination of mercury (Hg) concentrations in smallmouth bass (Micropterus dolomieu) to monitor mercury concentrations in smallmouth bass (micropterus dolomieu) from six sites in southern Missouri were captured by electrofishing. Blood samples More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Mercury contamination from historic gold mining operations is widespread in many rivers, lakes, and reservoirs on the western slopes of the Sierra Nevada. A multidisciplinary investigation by USGS is attempting to better understand mercury dynamics and to identify hot spots within Camp Far West Reservoir in order to determine if remediation More...
Publisher: Other (ScienceDirect (Elsevier)) | Format: URL
tinyurl.com — Organochlorine pesticide and total polychlorinated biphenyl (PCB) concentrations were measured in largemouth bass from the Tombigbee River near a former DDT manufacturing facility at McIntosh, Alabama. Concentrations of DDT isomers in McIntosh bass remained unchanged from 1974 to 2004 and were four times greater than contemporary concentrations 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: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — This is a research summary who's project objectives are to: 1) Coordinate watershed stakeholders in order to guide the implementation of watershed restoration actions that are consistent with stakeholder objectives, 2) Monitor physical habitat conditions and natural production of juvenile, smolt, and adult steelhead in the Wind River sub-basin, More...
Publisher: USGS | Science Center: Upper Midwest Environmental Sciences Center (UMESC, LaCrosse) | Format: URL
www.umesc.usgs.gov — Paddlefish (Polyodon spathula) have been lost from four states and Canada, and 11 of 22 states within the remaining species range now list the paddlefish as endangered, threatened, or a species of special concern. Restoration of paddlefish populations is a shared goal of many state and federal agencies. UMESC scientists, in collaboration with the More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Bull trout were listed by the U.S. Fish and Wildlife Service as a threatened species throughout the Columbia and Klamath river basins in 1998, and Oregon has listed the North Fork Malheur River population "Of Special Concern". Reasons for the decline of bull trout in the Malheur River likely include habitat degradation, habitat fragmentation, and More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — With the proposed removal or laddering of Condit Dam scheduled for 2006, Rattlesnake Creek has high potential to support reintroduced or naturally colonizing populations of salmon and steelhead. Research on resident trout populations will serve as a surrogate for an initial evaluation of limiting factors to salmon and steelhead production in the More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Many diseases of trout and salmon persist in our cultured fish stocks today, despite improvements in fish culture practices and years of research on vaccines and chemotherapeutants. An excellent example is bacterial kidney disease (BKD), caused by the bacterium Renibacterium salmoninarum. Infections by R. salmoninarum are considered by many to be More...
Publisher: USGS | Science Center: Fisheries: Aquatic and Endangered Resources | Format: URL
www.usgs.gov — Nearly 40 percent of fish species in North American streams, rivers and lakes are now in jeopardy, according to the most detailed evaluation of the conservation status of freshwater fishes in the last 20 years. The 700 fishes now listed represent a staggering 92 percent increase over the 364 listed as "imperiled" in the previous 1989 study More...
U.S. Department of the Interior |
U.S. Geological Survey