Age Structured Assessment of the Togiak Herring Stock, 1978-1992, and Preliminary Forecast of Abundance for 1993 PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Age Structured Assessment of the Togiak Herring Stock, 1978-1992, and Preliminary Forecast of Abundance for 1993 PDF full book. Access full book title Age Structured Assessment of the Togiak Herring Stock, 1978-1992, and Preliminary Forecast of Abundance for 1993 by Fritz Funk. Download full books in PDF and EPUB format.
Author: Fritz Funk
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 11
Get Book Here
Book Description
Author: Fritz Funk
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 11
Get Book Here
Book Description
Author: Fritz Funk
Publisher:
ISBN:
Category : Atlantic herring fisheries
Languages : en
Pages : 108
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 206
Get Book Here
Book Description
Author: Fritz Funk
Publisher: Alaska Sea Grant College Program
ISBN:
Category : Nature
Languages : en
Pages : 1060
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category : Herring fisheries
Languages : en
Pages : 108
Get Book Here
Book Description
Author: Erik Hamilton Williams
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 196
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category : Herring fisheries
Languages : en
Pages : 100
Get Book Here
Book Description
Author: Fritz Funk
Publisher:
ISBN:
Category : Herring fisheries
Languages : en
Pages : 120
Get Book Here
Book Description
Author: Canada. Department of Fisheries and Oceans
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
Get Book Here
Book Description
Author: Alaska. Department of Fish and Game
Publisher:
ISBN:
Category : Herring fisheries
Languages : en
Pages : 114
Get Book Here
Book Description
