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.

Permanent link to this Catalogue record:
publications.gc.ca/pub?id=9.805253&sl=0

Publication information
Department/Agency Canada. Department of Fisheries and Oceans.
Canada. Canadian Stock Assessment Secretariat.
Title 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.
Series title Canadian Stock Assessment Secretariat research document, 1480-4883 ; 99/115
Publication type Series - View Master Record
Language [English]
Format Electronic
Electronic document
Note(s) Includes bibliographical references (p. 10-11).
Publishing information Ottawa : Fisheries and Oceans Canada, 1999.
Author / Contributor Chen, Yong,1963-
Mello, Luiz G. S.
Description 16 p. : fig., graphs, maps, tables.
Catalogue number
  • Fs70-1/1999-115E-PDF
Subject terms Fisheries resources
Salt water fish
Fishing area
Fisheries management
Request alternate formats
To request an alternate format of a publication, complete the Government of Canada Publications email form. Use the form’s “question or comment” field to specify the requested publication.
Date modified: