Results 121 to 130 of about 1,852 (178)

Corroboration of a Bioenergetics Model for Sockeye Salmon

Transactions of the American Fisheries Society, 1989
Abstract We constructed a bioenergetics model for sockeye salmon Oncorhynchus nerka and evaluated its sensitivity to parameter error. When used to predict annual growth, the model was most sensitive, in declining order of importance. to changes in the intercept of the dependence of consumption on body weight, the proportion of maximum consumption, the ...
David A. Beauchamp, Donald J. Stewart, G. L. Thomas   +2 more
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11-KETOTESTOSTERONE: AN ANDROGEN FOR SOCKEYE SALMON

Canadian Journal of Biochemistry and Physiology, 1961
11-Ketotesterone, a hormone in the blood of sockeye salmon, has been shown to have androgenic activity for this species. It influences skin thickness and coloration, flesh pigmentation, and spermatogenesis in the male. The effect of 11-ketotestosterone is not so pronounced in the female but it influences both skin thickness and coloration.
D. R. Idler, I. I. Bitners, P. J. Schmidt   +2 more
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Productivity and life history of sockeye salmon in relation to competition with pink and sockeye salmon in the North Pacific Ocean

Canadian Journal of Fisheries and Aquatic Sciences, 2015
Sockeye salmon (Oncorhynchus nerka) populations from Southeast Alaska through British Columbia to Washington State have experienced similar declines in productivity over the past two decades, leading to economic and ecosystem concerns. Because the declines have spanned a wide geographic area, the primary mechanisms driving them likely operate at a ...
Gregory T. Ruggerone, Brendan M. Connors
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The Demise of Owikeno Lake Sockeye Salmon

North American Journal of Fisheries Management, 2001
Abstract A persistent period of low abundance in what was once the second largest fishery for sockeye salmon Oncorhynchus nerka in British Columbia has kept the Rivers Inlet fishery closed since 1996. Initial speculation about the cause of the decline focused on factors such as reduced egg-to-fry survival, declining quantity and quality of spawning ...
S. M. McKinnell, C. C. Wood, D. T. Rutherford, K. D. Hyatt, D. W. Welch   +4 more
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The Rivers Inlet Sockeye Salmon

Journal of the Fisheries Research Board of Canada, 1958
The Rivers Inlet sockeye catch has averaged about 1 million fish per year, over 45 years. These are from smolts produced in a cold, deep lake, only 30 square miles in extent, and most of it heavily silted by glacial tributaries. The water has only a moderate lime content and its reaction is neutral or very slightly acid.
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Hemoglobins of the sockeye salmon, Oncorhynchus nerka

Comparative Biochemistry and Physiology Part A: Physiology, 1988
Abstract 1. 1. Vertical starch-gel electrophoresis at pH8.6 revealed hemoglobin multiplicity with several distinct cathodal and anodal hemoglobin components. 2. 2. Cathodal hemoglobin components exhibited a higher oxygen affinity than the anodal hemoglobin components. 3. 3.
Jodyne Sauer, John P. Harrington
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Magnetic field detection in sockeye salmon

Journal of Experimental Zoology, 1981
AbstractPrevious research has indicated that lake‐migrating sockeye salmon fry have compass directional preferences, cued in part by magnetic fields. This paper reports the results of experiments designed to compare the magnetosensory system of salmon with those of other organisms.
Thomas P. Quinn, Ronald T. Merrill, Ernest L. Brannon   +2 more
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Sounding Response of the Kokanee and Sockeye Salmon

Journal of the Fisheries Research Board of Canada, 1968
When frightened, sockeye and kokanee salmon dive into deeper waters. This is termed the "sounding response."The sounding response in these fish is accompanied by the expulsion of gas from the swimbladder via the pneumatic duct. This gas loss is active and results from the contraction of the circular muscle fibers in the wall of the swimbladder.Gas loss
H. H. Harvey, W. S. Hoar, C. R. Bothern
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Dynamic in-lake spawning migrations by female sockeye salmon

Ecology of Freshwater Fish, 2007
Abstract –  Precise homing by salmon to natal habitats is considered the primary mechanism in the evolution of population‐specific traits, yet few studies have focused on this final phase of their spawning migration. We radio tagged 157 female sockeye salmon (Oncorhynchus nerka) as they entered Lake Clark, Alaska, and tracked them every 1–10 days to ...
D. B. Young, C. A. Woody
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Effect of introducing a competitor on cyclic dominance of sockeye salmon

Journal of Theoretical Biology, 2014
We study the effects of introducing a competing species into a 3-species model for the population dynamics of sockeye salmon, thereby converting a food chain into a diamond module. We find that this often leads to the disappearance of the 4-year oscillation of sockeye salmon known as cyclic dominance when parameters are chosen such that all four ...
Christoph K. Schmitt, Christian Guill, Eddy Carmack, Barbara Drossel   +3 more
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