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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| 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. |
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| Type de publication | Monographie - Voir l'enregistrement principal |
| Langue | [Anglais] |
| Format | Texte numérique |
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| Description | 16 p. : fig., graphs, maps, tables. |
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