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008150406s1999    oncdb   ob   f000 0 eng d
040 |aCaOODSP|beng
041 |aeng|bfre
043 |an-cn---
0861 |aFs70-1/1999-115E-PDF
1001 |aChen, Yong,|d1963-
24510|aDeveloping 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 |h[electronic resource] / |cYong Chen and Luiz G. S. Mello.
260 |aOttawa : |bFisheries and Oceans Canada, |c1999.
300 |a16 p. : |bfig., graphs, maps, tables.
4901 |aCanadian Stock Assessment Secretariat research document, |x1480-4883 ; |v99/115
504 |aIncludes bibliographical references (p. 10-11).
520 |aIn 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.
69207|2gccst|aFisheries resources
69207|2gccst|aSalt water fish
69207|2gccst|aFishing area
69207|2gccst|aFisheries management
7001 |aMello, Luiz G. S.
7101 |aCanada. |bDepartment of Fisheries and Oceans.
7102 |aCanada.|bCanadian Stock Assessment Secretariat.
830#0|aCanadian Stock Assessment Secretariat research document,|x1480-4883 ; |v99/115|w(CaOODSP)9.507740
85640|qPDF|s1.38 MB|uhttps://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-1999-115-eng.pdf