Results 171 to 180 of about 15,916 (214)

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
openaire   +1 more source

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
openaire   +1 more source

Cardiovascular Dynamics in Swimming Adult Sockeye Salmon

Journal of the Fisheries Research Board of Canada, 1967
Dorsal aortic blood pressure, heart rate, and oral water pressure were recorded in adult sockeye salmon (Oncorhynchus nerka) while they were resting in darkened aquaria or swimming in an illuminated tunnel-respirometer. Pressures were recorded on an oscillograph attached to pressure transducers connected with cannulae in the dorsal aorta and oral ...
L. S. Smith, J. R. Brett, J. C. Davis
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Maturational steroids and gonadotropin in upstream migratory sockeye salmon

General and Comparative Endocrinology, 1986
The circulating serum concentrations of various steroid hormones in mature sockeye salmon were measured at four different developmental stages in their upstream migration to spawn at Adams River in British Columbia, Canada. In females, a high level of estradiol-17 beta was found in fish at the first location, and it persisted until immediately before ...
B, Truscott, D R, Idler, Y P, So, J M, Walsh   +3 more
openaire   +2 more sources

Phototactic behaviour of emerging sockeye salmon fry

Animal Behaviour, 1964
Abstract A fry trap designed to study the behaviour of emerging sockeye salmon fry in Brooks River, Alaska, during the spring of 1961 revealed the following: 1. 1. The initial emergence of sockeye salmon, fry from natal gravels was basically nocturnal.
openaire   +1 more source

Acidification severely suppresses spawning of hime salmon (land-locked sockeye salmon, Oncorhynchus nerka)

Aquatic Toxicology, 2000
A laboratory study was conducted to investigate the effects of an acidic environment on the female sexual behavior of hime salmon (land-locked sockeye salmon, Oncorhynchus nerka). Spawning hime salmon were extremely sensitive to the acidity of ambient water.
S, Kitamura, K, Ikuta
openaire   +2 more sources

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
openaire   +1 more source

Vertebral Abnormalities in Sockeye, Pink, and Chum Salmon

Transactions of the American Fisheries Society, 1966
Abstract Radiographs of vertebral structures of 10,377 sockeye, 4,403 chum, and 4,777 pink salmon collected in 1958 to 1962 were examined to determine the frequency of occurrence of abnormal vertebrae in wild populations of mature Pacific salmon. Various types of deviations from the orderly processes of development or segmentation that resulted in ...
Charles D. Gill, Donald M. Fisk
openaire   +1 more source