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North-East Arctic (NEA) haddock (Melanogrammus aeglefinus Linne) is the target species for investigation. In this project, an attempt will be made to improve the methods of estimating inputs for predictions and investigate uncertainty in stock assessment and projection of haddock. In order to improv...

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Bibliographic Details
Main Author: Alexey Russkikh
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
stock assessment
projection
weight at age
maturity at age
uncertainty
spawning stock biomass
fishing mortality
reference points
bootstrap error distribution. Russkikh
Arctic
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.519.4834
http://www.unuftp.is/static/fellows/document/alexeyprf04.pdf
Description
Summary:North-East Arctic (NEA) haddock (Melanogrammus aeglefinus Linne) is the target species for investigation. In this project, an attempt will be made to improve the methods of estimating inputs for predictions and investigate uncertainty in stock assessment and projection of haddock. In order to improve current methods of estimating inputs for predictions, alternative methods were compared with the “averaging ” methods, which are currently used in the Arctic Fisheries Working Group (AFWG). It was established empirically and supplemented by statistical tests that the “cohort ” method gives the best results for predicting weight at age in stock for the youngest age groups in general and all age groups for short-term projection. The retrospective estimates and forecasts of spawning stock biomass, recruitment and fishing mortality in previous years from xADAPT and XSA are slightly different for the period 2000-2006, but working group estimates lie within the bootstrap error distribution. Suggested algorythms based on the ADAPT framework allow an investigation of part of

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