Download or read book Alaska Fishery Research Bulletin written by and published by . This book was released on 1997 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interrelationships of Pacific Herring Clupea Pallasi Populations and Their Relation to Large scale Environmental and Oceanographic Variables written by Erik Hamilton Williams and published by . This book was released on 1999 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recruitment estimates for Pacific herring, Clupea pallasi, populations in the Bering Sea and Northeast Pacific Ocean are highly variable, difficult to forecast, and crucial for determining optimum harvest levels. Age-structured population models for annual stock assessments of the sac-roe fisheries rely on fishery and survey age composition data tuned to an auxiliary survey of total biomass. In Chapter 1, the first age-structured model for Norton Sound herring was developed similarly to existing models. Estimates of variability from age-structured stock assessment models for Pacific herring are often not calculated. In Chapter 2, a parametric bootstrap procedure using a fit of the Dirichlet distribution to observed age composition data was developed as a quick and easy method for computing error estimates of model estimates. This bootstrap technique was able to capture variability beyond that of the multinomial distribution. This technique can provide estimates of variability for existing population models with age composition data requiring little change to the original model structure. Recruitment time series from Pacific herring stock assessment models for 14 populations in the Bering Sea and Northeast Pacific Ocean were analyzed for links to the environment. For some populations, recruitment series were extended backward in time using cohort analysis. In chapter 3, correlation and multivariate cluster analyses were applied to determine herring population associations. There appear to be four major herring groups: Bering Sea, outer Gulf of Alaska, coastal Southeast Alaska, and British Columbia. These associations were combined with an exploratory correlation analysis of environmental data in chapter 4. Appropriate time periods for environmental variables were determined for use in Ricker type environmentally dependent spawner-recruit forecasting models. Global and local scale environmental variables were examined in forecasting models, resulting in improvements in recruitment forecasts compared to models without environmental data. The exploratory correlation analysis and best fit models, determined by jacknife error prediction, indicated temperature data corresponding to the year of spawning resulted in the best forecasting models. The Norton Sound age-structured model, parametric bootstrap procedure, and recruitment forecasting models serve as enhancements to the decision process of managing Pacific herring fisheries.

Download or read book Fishery Stock Assessment Models written by Fritz Funk and published by Alaska Sea Grant College Program. This book was released on 1998 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume bring fisheries modelers up to date on stock assessment modeling as a research tool. It has 55 peer-reviewed papers from all parts of the world, presented at the 1997 symposium Fishery Stock Assessment Models for the 21st Century, in Anchorage, Alaska.

Download or read book Current References in Fish Research written by and published by . This book was released on 1998 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improving Fish Stock Assessments written by Committee on Fish Stock Assessment Methods and published by National Academies Press. This book was released on 1998-03-13 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean harvests have plateaued worldwide and many important commercial stocks have been depleted. This has caused great concern among scientists, fishery managers, the fishing community, and the public. This book evaluates the major models used for estimating the size and structure of marine fish populations (stock assessments) and changes in populations over time. It demonstrates how problems that may occur in fisheries data--for example underreporting or changes in the likelihood that fish can be caught with a given type of gear--can seriously degrade the quality of stock assessments. The volume makes recommendations for means to improve stock assessments and their use in fishery management.

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2004-05 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Characterization of the North Aleutian Shelf Nearshore Region written by and published by . This book was released on 1983 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Outer Continental Shelf Environmental Assessment Program written by and published by . This book was released on 1986 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Zoological Record written by and published by . This book was released on 1870 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceanic Abstracts written by and published by . This book was released on 1997-10 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federal Register written by and published by . This book was released on 1997-02-18 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of Shellfish Research written by and published by . This book was released on 2005 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regulatory Impact initial Flexibility Analysis of Proposed Inshore offshore Allocation Alternatives Amendment 18 23 to Groundfish Bering Sea and Aleutian Islands Fisheries Management Plan FMP and Gulf of Alaska Groundfish Fisheries Management Plan FMP written by and published by . This book was released on 1992 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Time and Complexity in Historical Ecology written by William Balée and published by Columbia University Press. This book was released on 2006-06-22 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of studies by anthropologists, botanists, ecologists, and biologists is an important contribution to the emerging field of historical ecology. The book combines cutting-edge research with new perspectives to emphasize the close relationship between humans and their natural environment. Contributors examine how alterations in the natural world mirror human cultures, societies, and languages. Treating the landscape like a text, these researchers decipher patterns and meaning in the Ecuadorian Andes, Amazonia, the desert coast of Peru, and other regions in the neotropics. They show how local peoples have changed the landscape over time to fit their needs by managing and modifying species diversity, enhancing landscape heterogeneity, and controlling ecological disturbance. In turn, the environment itself becomes a form of architecture rich with historical and archaeological significance. Time and Complexity in Historical Ecology explores thousands of years of ecological history while also addressing important contemporary issues, such as biodiversity and genetic variation and change. Engagingly written and expertly researched, this book introduces and exemplifies a unique method for better understanding the link between humans and the biosphere.

Download or read book The Community Development Quota Program in Alaska written by Committee to Review the Community Development Quota Program and published by National Academies Press. This book was released on 1999-05-17 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the performance and effectiveness of the Community Development Quotas (CDQ) programs that were formed as a result of the Sustainable Fisheries Act of 1996. The CDQ program is a method of allocating access to fisheries to eligible communities with the intent of promoting local social and economic conditions through participation in fishing-related activities. The book looks at those Alaskan fisheries that have experience with CDQs, such as halibut, pollock, sablefish, and crab, and comments on the extent to which the programs have met their objectives--helping communities develop ongoing commercial fishing and processing activities, creating employment opportunities, and providing capital for investment in fishing, processing, and support projects such as infrastructure. It also considers how CDQ-type programs might apply in the Western Pacific.

Download or read book Sustaining Alaska s Fisheries written by Bob King and published by State of Alaska Alaska Department of Fish and Game. This book was released on 2009-01-01 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pictorial retrospective containing stories of visionary pioneers, scientists, and the leaders who have been a part of developing Alaska's sustainable commercial fisheries management principles.