Results 131 to 140 of about 965 (180)
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An experimental analysis of territory size in juvenile steelhead trout
Animal Behaviour, 2000I experimentally manipulated levels of food abundance and density of competitors to determine how these factors influence the territory size of juvenile steelhead trout, Oncorhynchus mykiss. Steelhead trout were held in artificial stream channels and I followed cohorts that were fed at one of three levels of food abundance and stocked at one of three ...
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Coronary degeneration in sexually mature rainbow and steelhead trout, Salmo Gairdneri
Atherosclerosis, 1978Correlation of coronary arteriosclerosis with sexual maturation was found in rainbow and steelhead trout. All sexually mature nonanadromous rainbow, precocial male steelhead, and adult spawning steelhead had myointimal hyperplasia but it was infrequent in immature juveniles.
J E, McKenzie +3 more
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Ecosystem indicators of marine survival in Puget Sound steelhead trout
Progress in Oceanography, 2020Abstract Understanding ecosystem drivers of fish stock performance is essential to improving conservation and management. We used a hypothesis-driven approach to identify potential ecosystem indicators and developed a retrospective analysis using regression models of steelhead trout marine survival in Puget Sound, an urban estuary in Washington State,
Kathryn L. Sobocinski +3 more
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General and Comparative Endocrinology, 1994
Steelhead and hybrid trout (rainbow trout male, steelhead female) presmolts and smolts, Oncorhynchus mykiss, exposed to 30/1000 seawater (SW) for 24 hr manifested progressively lower plasma sodium values from December to May. The increase in plasma sodium after 24 hr in SW diminished significantly after March, with the hybrids (which were heavier in ...
J M, McLeese +4 more
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Steelhead and hybrid trout (rainbow trout male, steelhead female) presmolts and smolts, Oncorhynchus mykiss, exposed to 30/1000 seawater (SW) for 24 hr manifested progressively lower plasma sodium values from December to May. The increase in plasma sodium after 24 hr in SW diminished significantly after March, with the hybrids (which were heavier in ...
J M, McLeese +4 more
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The Effects of Angling and Hatchery Trout on the Abundance of Juvenile Steelhead Trout
Transactions of the American Fisheries Society, 1973Abstract We assessed the effects of angling and planted trout on the abundance of wild juvenile steelhead trout in a rearing stream with underwater censusing of abundance and angling for steelhead in sections with and without planted trout. A large proportion of the juvenile steelhead were removed by angling.
Herbert A. Pollard, Ted C. Bjornn
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Transactions of the American Fisheries Society, 2002
Abstract A major cause of population declines among interior cutthroat trout subspecies Oncorhynchus clarki ssp.is hybridization with introduced rainbow trout O. mykiss ssp. Coastal cutthroat trout O. c. clarki have also experienced population declines in recent decades and are known to hybridize with coastal rainbow trout/steelhead O. m.
Jon Baker, Paul Bentzen, Paul Moran
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Abstract A major cause of population declines among interior cutthroat trout subspecies Oncorhynchus clarki ssp.is hybridization with introduced rainbow trout O. mykiss ssp. Coastal cutthroat trout O. c. clarki have also experienced population declines in recent decades and are known to hybridize with coastal rainbow trout/steelhead O. m.
Jon Baker, Paul Bentzen, Paul Moran
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North American Journal of Fisheries Management, 2001
Abstract Hatchery-reared steelhead Oncorhynchus mykiss that do not emigrate as smolts shortly after release may harm wild fish communities through ecological interactions. We used systematic, stratified snorkeling surveys to document the relative abundance of wild rainbow trout (nonanadromous O. mykiss), bull trout Salvelinus confluentus, and westslope
Geoffrey A. McMichael, Todd N. Pearsons
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Abstract Hatchery-reared steelhead Oncorhynchus mykiss that do not emigrate as smolts shortly after release may harm wild fish communities through ecological interactions. We used systematic, stratified snorkeling surveys to document the relative abundance of wild rainbow trout (nonanadromous O. mykiss), bull trout Salvelinus confluentus, and westslope
Geoffrey A. McMichael, Todd N. Pearsons
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Chylomicra in the serum of postprandial steelhead trout (Salmo gairdnerii)
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 19851. 1. Postprandial effects on serum lipoprotein distribution were determined in juvenile steelhead trout (Salmo gairdnerii). 2. 2. As many as eight lipoproteins were detected, including proteins of α, α2, and β mobility, as well as up to three discrete proteins with albumin-like mobility. 3. 3.
Mark A. Sheridan +2 more
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USE of Ozone To Control Ceratomyxosis in Steelhead Trout
Ozone: Science & Engineering, 1987Abstract Tests conducted with a pilot scale ozone system to control the infective stage of the fish Pathogen Ceratomvya shasta found the minimum effective ozone dose to be a CT value (ozone residual x minutes of retention) of 1.23. Mortality of summer steelhead reared to, term on ozonated and raw river water was 1.4% and 81.2% permil; respectively ...
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Production of Juvenile Steelhead Trout in a Freshwater Impoundment
Ecological Monographs, 1967The purpose of this study was to investigate the population dynamics of juvenile steelhead trout (Salmo gairdneri Richardson) in an artificial freshwater impoundment of 13.3 hectares situated in Western Oregon. Data were collected from May 1962 until May 1963.
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