Results
351 - 375 of 2700 Items << < 10 11 12 13 14 15 16 17 18 19 > >>
351 - 375 of 2700 Items << < 10 11 12 13 14 15 16 17 18 19 > >>
|
Chinook salmon (Oncorhynchus tshawytscha) display the greatest variability of return times to freshwater of all Pacific salmon. Differential return times to freshwater have segregated populations of Chinook into two broad types or runs, fall...
2006-07-24T15:15:44Z (iso8601)
|
|
ambitious document, addressing not only the mitigation needs of salmon, but also proposing an institutional structure in which the Service would assume responsibility for coordinating a wide array of recovery actions.228 In substantive areas, the...
|
|
Caption on mount: Seining for salmon. Sand Island, Columbia River, Washington
PH Coll 293.2 |
|
Caption on image: Taking salmon out of pond net. Columbia River, Washington
PH Coll 293.11 |
|
Tillamook Bay chum salmon are caught commercially by gill-nets, both set and drift, and from 1928 through 1949 the landings have averaged 819,689 pounds per season. More chum salmon are caught on Tillamook Bay than on the rest of the Oregon...
1953-09 (iso8601)
|
|
A trophic model that simulates interactions between
a predatory fish (Pacific hake, Merluccius productus), forage
fish, and juvenile salmon off the Columbia River
was constructed to identify if trophic interactions could
account for marine...
2007 (iso8601)
|
|
In this study we present
new information on seasonal variation
in absolute growth rate in length of
coho salmon (Oncorhynchus kisutch) in
the ocean off Oregon and Washington,
and relate these changes in growth
rate to concurrent changes in the...
2005 (iso8601)
|
|
The world’s output of farmed fish has grown steadily over the past two decades or so. Most
notably in the UK, since the mid 1980’s, a rapid increase in farmed salmon production has taken
place. Given that many of the world’s oceans are overfished,...
2006-11 (iso8601)
|
|
Salmon is an anadromous species that during its feeding and spawning migrations is sought after catch for commercial and recreational fisheries. The management of salmon fisheries is complicated by the combination of mixed and single stock...
2012 (iso8601)
|
|
among scientists and managers than ever before. By 1995, all of the basin's recovery plans, Return to the River, and the National Research Council's Upstream report urged an adaptive approach.21
Other essential pieces of an adaptive management...
|
|
Caption on mount: Taking salmon out of pond net. Columbia River, Washington
|
|
Hatchery supplementation of anadromous salmon is extensive across the Pacific Northwest region with millions of juvenile salmon stocked annually. The influence of hatchery-origin fish as prey items in recipient ecosystems has been explored, but...
2012 (iso8601)
|
|
Genetic differences between early and late forms of
Alaskan chinook salmon (Oncorhynchus tshawytscha) were
identified using two genetic approaches: mitochondrial
DNA (mtDNA) analysis and protein electrophoresis. The
study populations consisted of...
1994-02-04 (iso8601)
|
|
Periodic determinations of plasma hormone levels suggested that changes in interrenal activity are unrelated to changes in thyroidal or gonadal activity during development (smoltification) of juvenile coho salmon (Oncorhynchus kisutch). Moreover,...
1988-02-09 (iso8601)
|
|
Pacific Coast estuaries provide important rearing habitats leading to improved growth and survival for juvenile chinook salmon. However, research has suggested that juvenile salmon have little use for estuarine habitats in the Columbia River. To...
2004-08-03 (iso8601)
|
|
Patterns of salmon distribution throughout a riverscape may be expected to change over time in response to
environmental conditions and population sizes. Changing patterns of use, including identification of consistently
occupied locations, are...
2014-01-01 (iso8601)
|
|
On March 24, 1999, the National Marine Fisheries Service (NMFS) published its final decision to list the Upper Willamette River evolutionarily significant unit (ESU) of chinook salmon as threatened under the Endangered Species Act (ESA). The...
1999-11-22 (iso8601)
|
|
which is probably as many denials as were issued in the last 100 years.' It would be an oversimplification to say that the Endangered Species Act caused all of these denials, or all the salmon-related developments of 1991-1994. Others did much -of...
|
|
ABSTRACT
Phase VI of the School-Based Klamath Restoration Project (319h) is a collaborative effort between seven Siskiyou County schools, the Siskiyou County Office of Education (SCOE), and the United States Fish and Wildlife Service (USFWS).
The...
2024-05-17
2005-07-19 2005-05-20 |
|
PREFACEThe annual Oregon hydrologic data report is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data-collection networks in each State, Puerto Rico, and the...
2024-05-17
2004-10-21 2004-06-16 |
|
ill.; Thesis (M.S.)-Oregon State University, 1988; Includes bibliographical references (leaves 74-80)
1988-05-17
2009-08-24 2009-12-08 |
|
The spawning habitat associated with fall chinook salmon (Oncorhynchus
tshawytscha) redd clusters was investigated in the Hanford Reach of the Columbia River.
A conceptual spawning habitat model is proposed that describes how geomorphic
features...
1998-09-30 (iso8601)
|
|
Distribution of fishes, both occupancy and abundance, is often correlated with landscape-scale characteristics (e.g., geology, climate, and human disturbance). Understanding these relationships is essential for effective conservation of depressed...
2012-03 (iso8601)
|
|
The life history of juvenile sockeye salmon (Oncorhynchus nerka) resident in Chignik River, Alaska, represents a departure from the lacustrine, pelagic existence typical of juveniles of this species. For this reason, the distribution, relative...
1965-11-15 (iso8601)
|
|
cur in the river below if the reservoir is drawn down to a low level during kite summer. Many more data must be obtained on the tolerance of anadromous fish to higher temperatures. The proposed operating schedule of all future reservoirs,...
|
