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Book The Migration and Spawning Distribution of Sockeye Salmon Within Lake Clark Alaska

Download or read book The Migration and Spawning Distribution of Sockeye Salmon Within Lake Clark Alaska written by Daniel B. Young and published by . This book was released on 2004 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Recent declines in the number of sockeye salmon Onchorynchus nerka returning to Lake Clark, Alaska have caused economic hardship in the region and raised resource concerns among local subsistence users and Federal managers. A lack of information regarding the distribution of spawning habitats in the glacially turbid Lake Clark watershed instigated this research. Radio telemetry was used to 1) determine the in-lake movement patterns of adult sockeye salmon and 2) identify sockeye salmon spawning locations. Sockeye salmon were radio tagged at they entered Lake Clark and tracked to spawning locations. After entering Lake Clark, sockeye salmon usually migrated to a region of the lake that was within 15 km of their spawning location. Tagged fish migrated faster and more directly to spawning locations in tributary rivers and lakes than to Lake Clark beaches. Thirty three spawning locations were identified in the Lake Clark watershed including 18 new spawning locations compared to previous scientific research and ten compared to traditional local knowledge. Most radio tagged sockeye salmon (65%) returned to spawning locations in glacially turbid waters and most spawning locations (75%) were adjacent to privately owned lands. Proactive measures should be taken to conserve both migration corridors and spawning habitats"--Leaves iii.

Book Ecological Studies of Sockeye Salmon and Related Limnological and Climatological Investigations Brooks Lane Alaska 1957

Download or read book Ecological Studies of Sockeye Salmon and Related Limnological and Climatological Investigations Brooks Lane Alaska 1957 written by Theodore R. Merrell and published by . This book was released on 1964 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecological studies on the fresh-water phases of the life history of sockeye salmon and studies on related limnology and climatology were made at Brooks Lake, Alaska, in 1957. Data are presented and interpreted on adult sockeye salmon spawning distributions and behavior, age, sex, length, fecundity, and bear predation; on juvenile sockeye salmon ages, food, growth, migration from the lake, relative abundance, and distribution in the lake; and on climatological and limnological factors that may influence sockeye salmon behavior and abundance.

Book Variation in Age and Size at Maturity of Lake Clark Alaska Sockeye Salmon

Download or read book Variation in Age and Size at Maturity of Lake Clark Alaska Sockeye Salmon written by Elizabeth B. Benolkin and published by . This book was released on 2009 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Salmon returning to Lake Clark, Alaska are a valuable subsistence, commercial and ecological resource, and are an important component of the larger Kvichak River escapement. Average escapement to the Kvichak River declined sharply during 1996-2005, prompting studies to investigate age and size at maturity, key life history traits of salmon linked to reproductive success and survival. We examined potential factors which may influence sockeye salmon Oncorhynchus nerka age and size at maturity: spawning habitat and ocean environment, and examined variation in both traits over time. Sockeye salmon age and length at maturity differed among spawning locations and between brood years, but no consistent patterns were observed among habitat types. Age and length at maturity differed over time; the proportion of older marine age 3 fish was larger in recent brood years, while fish were smaller during 1997-2001 compared to 1976-1980. Sea surface temperatures and coastal upwelling appeared to be important indicators of fish length, highlighting the importance of the ocean environment in salmon growth. These results demonstrate the complexity and importance of both the freshwater and ocean ecosystems in variation in age and size at maturity, and indicate that trends may not necessarily be similar among systems or years"--Leaf iii.

Book Influences of Spawning Habitat and Geography

Download or read book Influences of Spawning Habitat and Geography written by Molly T. McGlauflin and published by . This book was released on 2010 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Migratory Pattern of Adult Sockeye Salmon Oncorhynchus Nerka in Bristol Bay as Related to the Distribution of Their Home river Waters

Download or read book The Migratory Pattern of Adult Sockeye Salmon Oncorhynchus Nerka in Bristol Bay as Related to the Distribution of Their Home river Waters written by Richard R. Straty and published by . This book was released on 1969 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: The individual stocks of sockeye salmon that make up the annual spawning migration to the Bristol Bay region of Western Alaska are produced in the lakes and streams of ten major river systems, which discharge into the bay over a shoreline distance of 120 miles. The hypothesis adopted in this study was that the bay distribution of the waters from these river systems and controlling factors such as tide, wind and bottom topography determine the distribution of the individual stocks of sockeye salmon in Bristol Bay. This hypothesis was based on the premise that mature sockeye salmon return to their river system of origin to spawn and in doing so utilize recognizable characteristics of their home-river waters to guide them to its source. Hydrographic studies were carried out in upper Bristol Bay to determine the seaward course and distribution of the waters of major sockeye salmon-producing river systems draining into Bristol Bay. These studies included determination of the vertical and horizontal salinity distribution in the upper bay, tracking and plotting the distribution and course of individual river waters, which had been tagged with Rhodamine B dye, during flood and ebb tide and plotting the seaward course of plastic drift cards released at various strategic locations in upper Bristol Bay. From the results of these studies the course and distribution of the waters of each major sockeye salmon-producing river system was described for upper Bristol Bay. The distribution and migration routes of the individual stocks of Bristol Bay sockeye salmon were determined from analysis of the results of exploratory fishing operations carried out by research vessels of the United States and offshore and inshore adult sockeye salmon tagging studies conducted by the United States and Japan. The results of this analysis showed that the main migration route of all stocks of Bristol Bay sockeye is in the offshore waters of the southern half of the entrance to the bay and in the bay itself. All stocks remain in the offshore waters until within 20 to 50 miles of their home-river systems. They were, however, already beginning, to segregate according to, river of origin in the offshore waters when still as much as 150 miles from the mouths of their home-river systems. From this point to the head of Bristol Bay there was a progressive segregation of sockeye salmon stocks according to their river of origin. From these studies the general distribution and migration route of all major stocks of Bristol Bay sockeye salmon was described and illustrated on a chart of the area. Comparison of the distribution of the major river-system waters with that of their respective sockeye salmon stocks showed that the distribution of river water in outer Bristol Bay did not conform to the distribution of sockeye salmon whereas in the upper bay the individual sockeye stocks assumed a distribution which was very similar to that of their river-system waters. The conclusions reached were that the migration route, distribution and initial segregation of sockeye- stocks in the clear offshore waters of Bristol Bay are not influenced by the distribution of river water, but once in the turbid upper bay these features must somehow be related to the distribution of home-river waters and the recognizable properties they contain.

Book Tracking Sockeye Salmon Home

Download or read book Tracking Sockeye Salmon Home written by Carol Ann Woody and published by . This book was released on 2001 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a study plan for research with the following objectives: map sockeye spawning aggregations, determine characteristics of spawning habitat and its proximity to private, subsistence and sport land use areas.

Book Distribution Abundance and Growth of Juvenile Sockeye Salmon Oncorhynchus Nerka and Associated Species in the Naknek River System 1961 64

Download or read book Distribution Abundance and Growth of Juvenile Sockeye Salmon Oncorhynchus Nerka and Associated Species in the Naknek River System 1961 64 written by Robert J. Ellis and published by . This book was released on 1974 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Inriver Abundance and Spawner Distribution of Kenai River Sockeye Salmon Oncorhynchus Nerka 2006 2008

Download or read book Inriver Abundance and Spawner Distribution of Kenai River Sockeye Salmon Oncorhynchus Nerka 2006 2008 written by T. Mark Willette and published by . This book was released on 2012 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimates of sockeye salmon Oncorhynchus nerka escapement to the Kenai River were determined using mark-recapture methods. Radiotelemetry was used to determine the distribution of sockeye salmon spawners within the Kenai River watershed and estimate the migratory timing of major spawning stocks and the migration rates of scokeye salmon in the Kenai River in 2006-2008.

Book Spawning Distribution and Run Timing of Copper River Sockeye Salmon 2008 Annual Report

Download or read book Spawning Distribution and Run Timing of Copper River Sockeye Salmon 2008 Annual Report written by Keith M. van den Broek and published by . This book was released on 2009 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spawning distribution and run timing of adult sockeye salmon were assessed in the Copper River, Alaska, using radiotelemetry techniques. The purposes were to estimate the proportions of sockeye salmon returning to major spawning areas of the Copper River (Lower Copper, Chitina, Tonsina, Klutina, Tazlina, Gulkana, and Upper Copper rivers) and to describe the stock-specific, migratory timing profiles of sockeye salmon in the Copper River at the point of capture in Baird Canyon.

Book Book Catalog of the Library and Information Services Division Subject index

Download or read book Book Catalog of the Library and Information Services Division Subject index written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1977 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: