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Factors Affecting Coho Salmon Production In Oregon
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Book Synopsis Factors Affecting Coho Salmon Production in Oregon by : Dennis Leslie Scarnecchia
Download or read book Factors Affecting Coho Salmon Production in Oregon written by Dennis Leslie Scarnecchia and published by . This book was released on 1978 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eight scale characters of known hatchery and wild coho salmon (Oncorhynchus kisutch) were compared, and a linear discriminant function was used to determine if hatchery and wild adult coho salmon could be correctly identified by their scales. Eighty-two percent of the hatchery and 89% of the wild fish were correctly identified. Based on analysis of scales from adult salmon of unknown origin (hatchery or wild) and the estimated catch of hatchery coho (marked) taken by the Oregon sport fishery, concluded that 74.9% of the fish caught in the ocean from mid-June to mid-September 1977 had been released as smelts from hatcheries. Percentages of hatchery fish in the catch ranged from 85% near the mouth of the Columbia River to 61% at Winchester Bay on the southern Oregon coast. Fisheries on the south and central Oregon coast may have fished on higher percentages of wild coho salmon later in the season, probably because wild fish from coastal streams remained off of these ports while most fish destined for Columbia River hatcheries had already migrated northward. Scales from coho salmon were used to determine if location on the body from which they were taken would affect the values of five scale characters. Scales obtained from within a relatively small area above the lateral line between the dorsal and adipose fins differed widely in total radius, in radius of the freshwater zone, and in number of circuli in the freshwater zone. Scales taken farther above the lateral line had significantly lower values for all five characters observed. I conclude that substantial error can be introduced into interpretation of scale data if care is not taken to insure that scales from each fish come from precisely the same area of the body. A well chosen scrape sample yielded a result as satisfactory as that of a "preferred" or "key" scale. To investigate the relationship between streamflow and abundance of coho salmon, I correlated flow from several Oregon coastal rivers with catch of coho salmon from these rivers and with catch from the Oregon commercial troll fishery. I found a highly significant relationship between total streamflows during the freshwater residency of the fish for five Oregon coastal rivers combined and pounds of adult coho salmon caught by the Oregon commercial troll fishery from 1942 to 1962. There is also a significant relationship between total combined annual (January-December) flows for these rivers and a catch 2 years later. Conversely, I found a poor relationship between the lowest 60 consecutive days of summer flow and 2 two years later. I also found significant relationships between annual flows and catch in Tillamook Bay from 1934 to 1946. Only on the Siletz River from 1927 to 1940 do find a significant relationship between summer flows and catch. Higher flows during the freshwater stages of coho salmon probably provide more habitat and better conditions for growth as well as lessen susceptibility of fry and smelts to predation. I concluded that the relationships I found should probably not be used now to predict abundance of wild coho salmon because of (l) the unknown interaction between wild and hatchery fish, and (2) the preponderance of hatchery fish in the catch.
Book Synopsis Factors Determining Production of Coho Salmon, Oncorhynchus Kisutch, in Three Oregon Streams by : Donald Wallace Chapman
Download or read book Factors Determining Production of Coho Salmon, Oncorhynchus Kisutch, in Three Oregon Streams written by Donald Wallace Chapman and published by . This book was released on 1961 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Habitat-based Assessment of Coho Salmon Production Potential and Spawner Escapement Needs for Oregon Coastal Streams by : Thomas E. Nickelson
Download or read book A Habitat-based Assessment of Coho Salmon Production Potential and Spawner Escapement Needs for Oregon Coastal Streams written by Thomas E. Nickelson and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Physical Habitats Limiting the Production of Coho Salmon in Western Oregon and Washington by : Gordon H. Reeves
Download or read book Identification of Physical Habitats Limiting the Production of Coho Salmon in Western Oregon and Washington written by Gordon H. Reeves and published by . This book was released on 1989 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Endangered and Threatened Species ; Threatened Status for Southern Oregon/Northern California Coast Evolutionarily Significant Unit (ESU) of Coho Salmon by :
Download or read book Endangered and Threatened Species ; Threatened Status for Southern Oregon/Northern California Coast Evolutionarily Significant Unit (ESU) of Coho Salmon written by and published by . This book was released on 1997 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Factors Affecting the Natural Rearing of Juvenile Coho Salmon During the Summer Low Flow Season by : Lincoln S. Pearson
Download or read book Factors Affecting the Natural Rearing of Juvenile Coho Salmon During the Summer Low Flow Season written by Lincoln S. Pearson and published by . This book was released on 1985 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout: Coho salmon plan by : Oregon. Anadromous Fish Section
Download or read book Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout: Coho salmon plan written by Oregon. Anadromous Fish Section and published by . This book was released on 1982 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analysis of Factors Affecting the Production of Coho Salmon (Oncorhynchus Kisutch) in the Columbia River by : Percy Matthieu Washington
Download or read book An Analysis of Factors Affecting the Production of Coho Salmon (Oncorhynchus Kisutch) in the Columbia River written by Percy Matthieu Washington and published by . This book was released on 1982 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Ocean Conditions on Abundance of Coho Salmon (Oncorhynchus Kisutch) in the Oregon Production Area by : Thomas E. Nickelson
Download or read book The Influence of Ocean Conditions on Abundance of Coho Salmon (Oncorhynchus Kisutch) in the Oregon Production Area written by Thomas E. Nickelson and published by . This book was released on 1983 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Committee on Protection and Management of Pacific Northwest Anadromous Salmonids Publisher :National Academies Press ISBN 13 :0309556503 Total Pages :473 pages Book Rating :4.3/5 (95 download)
Book Synopsis Upstream by : Committee on Protection and Management of Pacific Northwest Anadromous Salmonids
Download or read book Upstream written by Committee on Protection and Management of Pacific Northwest Anadromous Salmonids and published by National Academies Press. This book was released on 1996-07-31 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of salmon to the Pacific Northwest--economic, recreational, symbolic--is enormous. Generations ago, salmon were abundant from central California through Idaho, Oregon, and Washington to British Columbia and Alaska. Now they have disappeared from about 40 percent of their historical range. The decline in salmon numbers has been lamented for at least 100 years, but the issue has become more widespread and acute recently. The Endangered Species Act has been invoked, federal laws have been passed, and lawsuits have been filed. More than $1 billion has been spent to improve salmon runs--and still the populations decline. In this new volume a committee with diverse expertise explores the complications and conflicts surrounding the salmon problem--starting with available data on the status of salmon populations and an illustrative case study from Washington state's Willapa Bay. The book offers specific recommendations for salmon rehabilitation that take into account the key role played by genetic variability in salmon survival and the urgent need for habitat protection and management of fishing. The committee presents a comprehensive discussion of the salmon problem, with a wealth of informative graphs and charts and the right amount of historical perspective to clarify today's issues, including Salmon biology and geography--their life's journey from fresh waters to the sea and back again to spawn, and their interaction with ecosystems along the way. The impacts of human activities--grazing, damming, timber, agriculture, and population and economic growth. Included is a case study of Washington state's Elwha River dam removal project. Values, attitudes, and the conflicting desires for short-term economic gain and long-term environmental health. The committee traces the roots of the salmon problem to the extractive philosophy characterizing management of land and water in the West. The impact of hatcheries, which were introduced to build fish stocks but which have actually harmed the genetic variability that wild stocks need to survive. This book offers something for everyone with an interest in the salmon issue--policymakers and regulators in the United States and Canada; environmental scientists; environmental advocates; natural resource managers; commercial, tribal, and recreational fishers; and concerned residents of the Pacific Northwest.
Author :California. Department of Fish and Game. Water quality planning project Publisher : ISBN 13 : Total Pages :63 pages Book Rating :4.:/5 (795 download)
Book Synopsis Factors Affecting the Natural Rearing of Juvenile Coho Salmon During the Summer Low Flow Season by : California. Department of Fish and Game. Water quality planning project
Download or read book Factors Affecting the Natural Rearing of Juvenile Coho Salmon During the Summer Low Flow Season written by California. Department of Fish and Game. Water quality planning project and published by . This book was released on 1967 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout. Part II : Coho Salmon Plan by : Oregon Department of Fish and Wildlife
Download or read book Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout. Part II : Coho Salmon Plan written by Oregon Department of Fish and Wildlife and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Oregon. Dept. of Fish and Wildlife. Fish Division. Anadromous Fish Section Publisher : ISBN 13 : Total Pages : pages Book Rating :4.:/5 (13 download)
Book Synopsis Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout by : United States. Oregon. Dept. of Fish and Wildlife. Fish Division. Anadromous Fish Section
Download or read book Comprehensive Plan for Production and Management of Oregon's Anadromous Salmon and Trout written by United States. Oregon. Dept. of Fish and Wildlife. Fish Division. Anadromous Fish Section and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecological Characterization of the Central and Northern California Coastal Region: pt.1. Regional characterization. pt.2. Species by :
Download or read book Ecological Characterization of the Central and Northern California Coastal Region: pt.1. Regional characterization. pt.2. Species written by and published by . This book was released on 1981 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Distribution and Abundance of Fishes and Invertebrates in West Coast Estuaries by :
Download or read book Distribution and Abundance of Fishes and Invertebrates in West Coast Estuaries written by and published by . This book was released on 1991 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Upstream Movement and Distribution of Private Hatchery Produced Coho Salmon Smolts Into Yaquina River Tributaries by : Brian Jonasson
Download or read book Upstream Movement and Distribution of Private Hatchery Produced Coho Salmon Smolts Into Yaquina River Tributaries written by Brian Jonasson and published by . This book was released on 1983 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Behavior and Ecology of Pacific Salmon and Trout by : Thomas P. Quinn
Download or read book The Behavior and Ecology of Pacific Salmon and Trout written by Thomas P. Quinn and published by University of Washington Press. This book was released on 2018-08-06 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Behavior and Ecology of Pacific Salmon and Trout combines in-depth scientific information with outstanding photographs and original artwork to fully describe the fish species critical to the Pacific Rim. This completely revised and updated edition covers all aspects of the life cycle of these remarkable fish in the Pacific: homing migration from the open ocean through coastal waters and up rivers to their breeding grounds; courtship and reproduction; the lives of juvenile salmon and trout in rivers and lakes; migration to the sea; the structure of fish populations; and the importance of fish carcasses to the ecosystem. The book also includes information on salmon and trout transplanted outside their ranges. Fisheries expert Thomas P. Quinn writes with clarity and enthusiasm to interest a wide range of readers, including biologists, anglers, and naturalists. He provides the most current science available as well as perspectives on the past, present, and future of Pacific salmon and trout. In this edition: Over 100 beautiful color photographs of salmon and troutUpdated information on all aspects of the salmon and trout life cycleExpanded coverage of trout