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276 - 300 of 2700 Items << < 7 8 9 10 11 12 13 14 15 16 > >>
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This report outlines long-term planning and monitoring activities that occurred in 1991 and 1992 in the Stanley Basin Lakes of the upper Salmon River, Idaho for the purpose of sockeye salmon (Oncorhynchus nerka) recovery. Limnological monitoring...
1992-01-01
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The arduous task of finding a solution to the enduring salmon crisis calls for
a non-trivial, comprehensive approach. Such a solution is likely to affect virtually
everyone in the Pacific Northwest. Ensuring public understanding of and support
for...
2003-11-26 (iso8601)
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Bycatch is repeatedly noted as a primary problem of fisheries management
and as the foremost negative impact of commercial fishing. In the Bering
Sea pollock fishery, salmon bycatch reduction measures have included gear
modifications but have...
2010 (iso8601)
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The paper is the first attempt to explore the ecological and economic impacts of genetic interaction between farmed and wild salmon over generations. An age- and stage-structured bioeconomic model is developed. The biological part of the model...
2010 (iso8601)
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The genetic basis of adaptation is complex as many fitness-related traits are quantitative and likely influenced by multiple genes with variable effects across different selective environments. One important adaptation for anadromous Chinook...
2007-11-29T16:00:47Z (iso8601)
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river reservoirs below the storage projects. The logic of the drawdown strategy was this: Assume the problem for Snake River salmon is the mainstem federal dams, which themselves slow the flow of water by backing the river up into broad, deep and...
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Adult Chinook salmon (Oncorhynchus tshawytscha) migrate from salt water to freshwater streams to spawn. Immune responses in migrating adult salmon are thought to diminish in the run up to spawning, though the exact mechanisms for diminished immune...
2016-01 (iso8601)
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Early life stages of many marine and diadromous fish species use sandy beach surf zones, which occur along >50% of the world's marine coastlines. This extensive habitat can provide juvenile fishes with an abundant supply of potential prey and the...
2012-10-05 (iso8601)
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This study examined the distribution and behavior of adult spring chinook salmon
(Oncorhynchus tshawytscha) related to patterns of stream temperature and physical
habitat at channel unit, reach, and basin-wide spatial scales in both a wilderness...
1996-07-08 (iso8601)
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From 1998-2000, laboratory studies were conducted to examine factors
that impact saltwater-entry behavior and saltwater preference (SWP) of juvenile
chinook salmon, Oncorhynchus tshawytscha. These factors included bacterial
kidney disease, stress...
2002-04-09 (iso8601)
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Criteria for the design and construction of a prototype streamside
incubator for Pacific salmon (Oncorhynchus) eggs and alevins
are described. Operation of the prototype and methods of transporting
freshly spawned salmon eggs from distant sources...
1969-12-11 (iso8601)
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Tidal marshlands in the upper estuary ecotone provide essential habitat for
juvenile salmonids. In this environment, salmonids grow rapidly and acclimate to
saltwater. Worldwide, tidal marshes have been diked and drained to provide
agricultural...
2010-08-06T18:09:40Z (iso8601)
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Interest in the distribution of Clostridium botulinum type E
was heightened by the sudden outbreak of human botulism from
smoked whitefish chubs and canned tuna fish in 1963. The question
arose as to how widely the organism is distributed among...
1969-08-07 (iso8601)
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In rodent models as well as in fish models there are significant
species differences in the susceptibility toward aflatoxin B₁ (AFB₁)
carcinogenesis. Mouse is less susceptible toward AFB₁ carcinogenesis
than rat. Researchers have come to the...
1985-10-24 (iso8601)
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This thesis addresses the costs of implementation of the Endangered Species Act (ESA)
in the particular case of Snake River chinook salmon. Unlike most previous listings under
the act, restoration of Snake River salmon will have impacts on a very...
1996-02-07 (iso8601)
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Environmental shifts accompanying salmon spawning migrations from ocean feeding grounds to natal freshwater streams can be severe, with the underlying stress often cited as a cause of increased mortality. Here, a salmonid microarray was used to...
2011-10-18
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K. D. Swan was the first photographer
for the U.S. Forest Service's Northern Region Headquarters in Missoula,
Montana. This collection represents his non-professional interests in outdoor
recreation and travel and does not contain many...
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Manuscripts, correspondence, films,
photographs, slides, and outdoor recreation and travel literature chiefly
concerning hunting and fishing.; Leslie Lee Richardson was born in the small mining town of Wardner,
Idaho, on April 3, 1898,...
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Structured estuarine habitats, such as salt marshes, seagrass beds, and oyster reefs, are recognized as critical nurseries for juvenile fish and crustaceans. Estuarine habitat usage by fish, including juvenile Pacific salmon Oncorhynchus spp., was...
2015 (iso8601)
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Trophic interactions within and among species vary widely across spatial scales and species’ ontogeny. However, the drivers and implications of this variability are not well understood. Juvenile Chinook salmon Oncorhynchus tshawytscha have a wide...
2015-10-14 (iso8601)
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Previous studies have shown that juvenile chinook salmon Oncorhynchus tshawytscha exposed in the field or the laboratory to polychlorinated biphenyls (PCBs), an anthropogenic stressor, are immunosuppressed. It is not known whether simultaneous...
2003-03 (iso8601)
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To model the behavior of the spring run Chinook salmon, we expanded the current dataset of salmon counts at the Winchester Dam, Winchester, Oregon, to include historical data from 1991 through 1997. These counts were used to identify Chinook...
2015-06-08 (iso8601)
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Approximately $1 billion a year is spent on salmon in the Pacific
Northwest. Spending has escalated, yet the number of wild runs
placed under the protection of the Endangered Species Act has
increased, creating social and political controversy....
2000-06-06 (iso8601)
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Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were
observed at a high flow during the spring of 1989 and at a low flow during the
spring of 1991 in the lower American River of California. Parameters of
microhabitats in eight...
1992-07-28 (iso8601)
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The community of trophically transmitted marine parasites of juvenile coho (Oncorhynchus kisutch) and Chinook
(Oncorhynchus tshawytscha) salmon across 8 years (2002–2009) was related to indices of physical and biological ocean conditions
and adult...
2014-11 (iso8601)
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