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851 - 875 of 2700 Items << < 30 31 32 33 34 35 36 37 38 39 > >>
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Date of memorandum: January 15, 1948; "Orthello L. Wallis, Ranger-Naturalist in charge of fisheries investigations 1947."
2008-09-02 2008-12-10 |
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The use of passive integrated transponder (PIT) tags in ecological studies is increasingly common, but evaluations of their performance and range of application in the field are still emerging. Here, we compare habitat unit–scale abundance...
2011 (iso8601)
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The nature of the interaction between juvenile coho salmon, Oncorhynchus kisutch (Walbaum), and fall chinook salmon, 0. tshawytscha (Walbaum), was studied in Sixes River, Oregon. Seining, snorkeling, and tagging were used to determine distribution...
1971-05-06 (iso8601)
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Generalized additive models (GAMs) were used to investigate the relationships between annual recruitment of natural coho salmon (Oncorhynchus kisutch) from Oregon coastal rivers and indices of the physical ocean environment. Nine indices were...
2012-01-19 (iso8601)
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The relationship between predator avoidance deficits induced by a simple handling stress and the level of plasma corticosteroids was determined for juvenile coho salmon Oncorhynchus kisutch. Groups of fish were held out of water for 1 min, then...
1992-07 (iso8601)
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Rising human global population, appetite for seafood, and the effects of climate change have pushed commercial marine fisheries around the globe onto trajectories that are chillingly unsustainable. Input from fishermen on what it means to have a...
2015-05-29 (iso8601)
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This project was initiated in an attempt to control furunculosis
(Aeromonas salmonicida) in a production hatchery rearing coho salmon.
An oral vaccine was prepared and administered to 520,000
juvenile coho salmon (Oncorhynchus kisutch) at the...
1967-09-28 (iso8601)
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Natural and gabion modified habitats containing coho salmon
(Oncorhynchus kisutch) were observed and measured seasonally in East
Fork Lobster Creek, a fifth order stream in western Oregon. Coho
salmon usually inhabited backwater and secondary...
1986-05-28 (iso8601)
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The bycatch problem has remained troubling and persistent, even in
fisheries that have rationalized their target fisheries. The Alaskan Pollock
fishery is an example of a fishery struggling to contain the bycatch of
salmon in spite of a...
2010 (iso8601)
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The goal of the Whole Watershed Restoration Initiative (WWRI) is to restore natural functions of whole watersheds in Oregon, Washington, and Idaho, while amplifying community-based partnerships focused on the strategic restoration of Pacific...
2011-05-24 (iso8601)
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Many contemporary fisheries and wildlife issues are complex,
messy, and divisive. Most share a set of common characteristics
including a lack of comprehensive scientific information, a limited
understanding of biological processes, a scarcity of...
2006-06-19 (iso8601)
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The evaluation of social investment in water pollution control
has been retarded by a lack of methodology with which to evaluate
the direct benefits. The objective of this dissertation was to develop
theory and methodology for estimating direct...
1965-08-13 (iso8601)
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Chinook salmon, Oncorhynchus tshawytscha, were reared from
fertilization of the eggs to several weeks after complete yolk absorption
at dissolved oxygen concentration of 3.5, 5.0, and 7.3 mg/liter and air-saturation
at temperatures of 10.5, 12.0,...
1971-09-27 (iso8601)
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The timing of two events in the early life history of coho salmon--emergence from
the gravel and entry into the ocean--is presumed to have evolved to ensure maximum
survival during these transition periods. Anthropogenic disturbances may disrupt...
1995-05-05 (iso8601)
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Oregon water temperature standards were described by former Oregon Governor John Kitzhaber’s Office as “an important component of the water quality element of the Oregon Plan [for Salmon and Watersheds]”. In 1998, Governor Kitzhaber’s Office and...
2004-05-07 (iso8601)
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In 1978, a 22 ha diked pasture in the Salmon River
estuary, Oregon, was restored to tidal influence. The
goal was to re-establish the original salt marsh. The
pasture had been diked for 17 years and was dominated by
upland pasture species. The...
1991-05-28 (iso8601)
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New coast and river craft registered at Astoria, 8; tonnage, 222.44.
The above statements include those vessels twice discharging or receiving part cargo at Astoria and Portland, which class is principally made up of the San Francisco passenger...
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counts from the game preserve on Sauvie Island indicate the popularity of the area. In 1964, over 10,000 hunter-days were recorded in this one area.
FISHERY RESOURCES
One of the outstanding uses of the Columbia River is the sport and...
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Irrigation.--Within the Klickitat Basin, opportunity for increase in irrigated acreage is limited to expansion in the Glenwood area. By enlarging the existing main canal and extending it to intercept the west fork of the Klickitat River,...
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Notwithstanding the quantity of ink that has been spilt over such questions, only a few things are clear. There was significant over-fishing and habitat disturbance in the Columbia River Basin long before the mainstem dams were built. Snake River...
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paved, this summer. The Sandy river is crossed, the Portland Auto Club House is passed, and an easy ascent is made to Chanticleer at an elevation of over nine hundred feet. The term "easy ascent" is used advisedly, for this part of the Columbia...
2004-03-02
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Master scanned with Epson 1640XL at 800 dpi. Image manipulated with Adobe Photoshop 7.0.
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Gold dredge on Yankee Fork of Salmon River It was the largest dredge in Idaho Dredge was reputed to be recovering $10,000 in flour gold each week
1941-06-19
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