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.
Lien permanent pour cette publication :
publications.gc.ca/pub?id=9.805253&sl=1
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 |
|
Descripteurs | Fisheries resources Salt water fish Fishing area Fisheries management |