Download or read book Effects of the Age composition of Spawning Sockeye Salmon on Future Returns of Sockeye Salmon to Bristol Bay Alaska written by Janelle C. Mueller and published by . This book was released on 2011 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The age structure of sockeye salmon on spawning grounds is highly variable, yet little is known about the influence of spawner age composition on subsequent abundance and age composition of recruits. Management of Bristol Bay sockeye salmon relies on estimated spawner abundance to determine escapement goals, without regard to age or size composition. This may not accurately reflect reproductive potential as a basis for setting escapement goals. Parental age structure and environmental conditions were included as independent variables in statistical models to evaluate their effects on the age structure of their progeny. In addition, relationships between spawner age composition and recruit abundance were examined. I found a significant relationship between the age composition of spawners and that of their progeny, as well as environmental effects on age composition. A higher proportion of spawners that spent three years in the ocean were associated with a higher proportion of recruits with this life history pattern, suggesting direct genetic and/or environmental influences. However, redefining spawner-recruit models based on spawner age composition did not significantly improve predictions of the overall number of recruits originating in a given brood year. Nevertheless, the ability to predict the age and hence size composition of returns (with uncertainty), implies that improved predictions of the total biomass of returns in a given year is possible.
Download or read book A Synopsis and Critique of Forecasts of Sockeye Salmon Returning to Bristol Bay Alaska in 1990 written by Stephen M. Fried and published by . This book was released on 1990 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The total number of sockeye salmon (Oncorhynchus nerka) forecasted to return to Bristol Bay in 1990 is 26,724,000 ( 80% confidence interval: 16,365,000 43,641,000). Runs are expected to exceed spawning escapement goals for all systems. Total projected sockeye salmon harvest is expected to be 15,989,000 (80% CI: 7,630,000 - 28,906,000). Most of this harvest will be taken within Bristol Bay inshore fishing districts (14,662,000), but some has been allocated to fisheries occurring in June in the vicinity of the Shumagin Islands and South Unimak under an existing management plan (8.3% of total Bristol Bay projected harvest: 1,327,000). The 1990 forecast was based on the ADF&G method which averaged results from three linear regression models based on the relationship between returns and either spawner, sibling, or smelt data. Based on the expected performance of several modifications of the ADF&G method, all available data was used to forecast 1990 runs to Nushagak and Togiak Districts, but data prior to the 1978 return year was omitted from calculations for Naknek-Kvichak, Egegik and Ugashik Districts. Al though out of range data were not used in calculations, their occurrence suggested that age-2.3 predictions for Kvichak, Egegik, and Ugashik Rivers could be too low. This could place the actual total return within the upper range of the 80% CI. The outlook for 1991-1993, based only on the spawner-recruit component of the ADF&G method, is for the total sockeye salmon run to Bristol Bay to be greatest in 1990 and least in 1991, mostly due to variations in the Kvichak River run. For all years examined, runs to all river systems are expected to exceed spawning goal requirements.
Download or read book Factors Affecting Pink Salmon Pre spawning Mortality in Southeast Alaska written by and published by . This book was released on 1991 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forecast of the 2001 Run of Sockeye Salmon to Bristol Bay written by Donald E. Rogers and published by . This book was released on 2000 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on the Age Composition of Sockeye Salmon Sampled from Spawning Grounds in the Wood River Lakes 1947 1967 written by Kenneth Roberson and published by . This book was released on 1968 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on the Abundance and Age Composition of Sockeye Salmon in Sampled Spawning Grounds in the Wood River Lakes 1968 and 1969 written by Dell H. Siler and published by . This book was released on 1970 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book History of the Fishery and Summary Statistics of the Sockeye Salmon Oncorhynchus Nerka Runs to the Chignik Lakes Alaska 1888 1966 written by Michael L. Dahlberg and published by . This book was released on 1979 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forecasts of the 1999 Sockeye Salmon Runs to Bristol Bay Using Traditional FRI Methodology written by Donald E. Rogers and published by . This book was released on 1998 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migratory Pathways of Maturing Sockeye Salmon in Bristol Bay Alaska written by Gregory B. Buck and published by . This book was released on 2003 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on Age Composition and Abundance of Sockeye Salmon Sampled from Spawning Grounds in the Wood River Lakes 1966 written by Kenneth Roberson and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forecast of the 2000 Run of Sockeye Salmon to Bristol Bay written by and published by . This book was released on 1999 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Historical Data on the Sockeye Salmon Runs to the Nushagak District Bristol Bay Alaska written by University of Washington. Fisheries Research Institute and published by . This book was released on 1967 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Synopsis and Critique of Forecasts of Sockeye Salmon Oncorhynchus Nerka Returning to Bristol Bay Alaska in 1987 written by Stephen M. Fried and published by . This book was released on 1987 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a final preseason forecast for sockeye salmon (Oncorhynchus nerka) returns to Bristol Bay, Alaska, in 1987, and a long range outlook of returns through 1990.
Download or read book Use of Air and Water Temperatures to Forecast Kvichak River Sockeye Salmon Returns from Smolt Migration Estimates written by Henry J. Yuen and published by . This book was released on 1984 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth of Sockeye Salmon in Relation to Abundance IntheKvichak District Bristol Bay Alaska written by O. A. Mathisen and published by . This book was released on 1969 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Spawning Sockeye Salmon Oncorhynchus Nerka on Small Streams in the Wood River Lakes Alaska written by Douglas Paul Peterson and published by . This book was released on 1998 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
