Results 181 to 190 of about 4,117 (224)

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

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

An Improved Sibling Model for Forecasting Chum Salmon and Sockeye Salmon Abundance

North American Journal of Fisheries Management, 2007
Abstract The sibling model is often one of the best methods for calculating preseason forecasts of adult return abundance (recruits) for populations of Pacific salmon Oncorhynchus spp. This model forecasts abundance of a given age-class for a given year based on the abundance of the previous age-class in the previous year.
Steven L. Haeseker, Brigitte Dorner, Randall M. Peterman, Zhenming Su   +3 more
openaire   +1 more source

The Skeena River Salmon Fishery, with Special Reference to Sockeye Salmon

Journal of the Fisheries Research Board of Canada, 1955
The general history of the Skeena River commercial salmon fishery is presented from 1877 to 1948. The changes in fishing areas, seasons and fishing methods are described, together with the trends in the catches obtained. The most accurate data pertain to the important sockeye salmon gill-net fishery.
openaire   +1 more source

SEX CHROMOSOMES IN THE SOCKEYE SALMON: A Y-AUTOSOME FUSION

Canadian Journal of Genetics and Cytology, 1978
Chromosomes of 21 sockeye salmon [Oncorhynchus nerka (Walbaum)] from three locations in Washington state were examined. All males had 57 chromosomes, while all females had 58 chromosomes. Both sexes had 104 chromosome arms. It appears that in males of this species the Y chromosome and an autosome have fused to form a metacentric chromosome.
openaire   +2 more sources

Liver arginase activity in the sockeye salmon, Oncorhynchus nerka

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1971
Abstract 1. 1. Liver arginase levels in adult sockeye salmon show characteristics similar to that of higher animals. 2. 2. Results show that sockeye liver arginase has a pH optimum of 9·5, is partially dependent on Mn2+ ions and has a temperature optimum of 45°C.
openaire   +2 more sources

Migratory Behavior of Sockeye Salmon Fry and Smolts

Journal of the Fisheries Research Board of Canada, 1967
Considerable new data on the characteristics of sockeye fry and smolt migrations, direct underwater observations of migrating smolts, and a review of the literature are presented here with a synthesis, evaluation, and interpretation of possible survival advantages of these phenomena.
W. L. Hartman, W. R. Heard, B. Drucker
openaire   +1 more source

Activity and behaviour in spawning sockeye salmon

2009
Total energy expenditures and muscle activity have been measured in spawning salmon but behaviour specific energy-use has never been been measured directly. This research used electromyogram (EMG) telemetry, combined with behaviour observations to assess activity levels and estimate relative energy use during spawning in sockeye salmon, Oncorhynchus ...
openaire   +1 more source

Convention for Protection of Sockeye Salmon Fisheries

American Journal of International Law, 1938
Cordell Hull, Herbert M. Marler
openaire   +1 more source

Pressure in the early life history of sockeye salmon.

2011
Young sockeye salmon (Oncorhynchus nerka) may occupy the epilimnion, thermocline or hypolimnion during lacustrine residence and may make extensive vertical migrations. Residence and migration over a range of pressure presents fish with certain physiological problems. Sockeye salmon meet these problems by adaptation, compromise and fortuity.
openaire   +1 more source