Ecology and Behavior of Juvenile Sockeye Salmon (Oncorhynchus Nerka) in Bristol Bay and the Eastern Bering Sea PDF Download
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Author: Richard R. Straty
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 158
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Author: Richard R. Straty
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 158
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Author: Edward Vincent Farley (Jr.)
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 272
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"Predicting annual returns of Bristol Bay sockeye salmon (Oncorhynchus nerka) has been difficult due to large, unexplained variations in return strength. Ocean conditions, particularly during the first few months after salmon leave freshwater, are believed to have a strong influence on their early marine growth and survival. Limited historical and present research suggests that sea temperature can affect juvenile Bristol Bay distribution. During years with cool spring sea temperatures, juvenile sockeye salmon are distributed nearshore along the Alaska Peninsula, whereas they are found further offshore during years with warm spring sea temperatures. Juvenile sockeye salmon are larger, in better condition, and have higher marine stage survival after the first year at sea when they are distributed further offshore than when they are distributed nearshore along the Alaska Peninsula. Juvenile sockeye salmon stomach contents also shift from primarily Pacific sand lance (Ammodytes hexapterus) and euphausiids to age 0 walleye pollock (Theragra chalcogramma) when their distribution changes from nearshore to further offshore. Annual averages of juvenile sockeye salmon growth rate potential (GRP) were generally lower among years and regions with cool spring sea temperatures. In addition, juvenile sockeye salmon GRP was generally higher in offshore regions than nearshore regions of the eastern Bering Sea shelf. A sensitivity analysis indicated that juvenile sockeye salmon GRP was more sensitive to changes in observed (August to September) sea surface temperatures during years when prey densities were lower. The results of the dissertation suggest that variability in early marine survival is primarily due to bottom-up control of the trophic structure of the eastern Bering Sea ecosystem"--Leaf iii.
Author: Thomas P. Quinn
Publisher: UBC Press
ISBN: 0774842431
Category : Nature
Languages : en
Pages : 392
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Book Description
The Behavior and Ecology of Pacific Salmon and Trout explains the patterns of mate choice, the competition for nest sites, and the fate of the salmon after their death. It describes the lives of offspring during the months they spend incubating in gravel, growing in fresh water, and migrating out to sea to mature. This thorough, up-to-date survey should be on the shelf of everyone with a professional or personal interest in Pacific salmon and trout. Written in a technically accurate but engaging style, it will appeal to a wide range of readers, including students, anglers, biologists, conservationists, legislators, and armchair naturalists.
Author: F. Favorite
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 312
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 794
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Author: Donald Wilbur Hood
Publisher:
ISBN:
Category : Marine resources
Languages : en
Pages : 648
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 344
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Author: United States. Bureau of Land Management
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 870
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 280
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 744
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