Developing an overall indicator for monitoring temporal variation in fish size at age and its application to cod (Gadus morhua) in the northwest Atlantic, NAFO subdivision 3Ps / Yong Chen and Luiz G.... : Fs70-1/1999-115E-PDF

In this study, principal component analysis (PCA) is proposed to summarize size-at-age data. Because fisheries data tend to be subject to atypical errors, a two-step procedure is proposed: a robust multivariate approach is applied to size-at-age data to identify outliers in data, and then a weighted PCA is applied with the defined outliers down-weighted. The resultant principle components (PCs) are interpreted with respect to the original variables. An indicator is identified from the resultant PCs for monitoring temporal variations in size-at-age data. The proposed approach is applied to size-at-age data of cod (Gadus morhua) in the Northwest Atlantic, NAFO subdivision 3Ps. An overall size-at-age indicator is developed for the cod stock.

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Renseignements sur la publication
Ministère/Organisme Canada. Department of Fisheries and Oceans.
Canada. Canadian Stock Assessment Secretariat.
Titre Developing an overall indicator for monitoring temporal variation in fish size at age and its application to cod (Gadus morhua) in the northwest Atlantic, NAFO subdivision 3Ps / Yong Chen and Luiz G. S. Mello.
Titre de la série Canadian Stock Assessment Secretariat research document, 1480-4883 ; 99/115
Type de publication Série - Voir l'enregistrement principal
Langue [Anglais]
Format Électronique
Document électronique
Note(s) Includes bibliographical references (p. 10-11).
Information sur la publication Ottawa : Fisheries and Oceans Canada, 1999.
Auteur / Contributeur Chen, Yong,1963-
Mello, Luiz G. S.
Description 16 p. : fig., graphs, maps, tables.
Numéro de catalogue
  • Fs70-1/1999-115E-PDF
Descripteurs Fisheries resources
Salt water fish
Fishing area
Fisheries management
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