Otolith morphometrics and population structure of Pacific sardine (Sardinops sagax) along the west coast of North America

Javor, Barbara and Lo, Nancy and Vetter, Russ (2011) Otolith morphometrics and population structure of Pacific sardine (Sardinops sagax) along the west coast of North America. Fishery Bulletin, 109(4), pp. 402-415.

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Official URL: http://fishbull.noaa.gov/1094/1094javor.pdf

Abstract

The broad distribution of Pacific sardine (Sardinops sagax) along the Pacif ic coast of North America makes it difficult for fisheries managers to identify regional stocks of this dominant small pelagic species. An investigation of morphometric characteristics of otoliths of Pacific sardine across most of their range revealed regional differences in populations. In a survey of over 2000 otoliths, all ages (with an emphasis on age-1 recruits) were compared. Principal components analysis, multivariate analysis of variance, and a novel method derived from regression and residuals calculations, termed perimeter-weight profiles (PWPs), revealed otolith similarities and differences. The results of the different approaches to statistical comparisons did not always agree. Sardine otoliths from Mexican waters were generally lighter and more lobate than those from U.S. and Canadian populations. Age-1 otoliths from northern California in 2006–07 tended to be heavier and smoother than those from other areas, including year-class cohorts from southern California. Comparisons of age-groups and year-classes of northern California otoliths with the use of the PWP models indicated signif icant trends in year-to-year patterns. In conjunction with other established indices of population structure, otolith PWPs are a useful tool for identifying local and regional stocks of Pacific sardine and may help distinguish populations of other fish species as well.

Item Type: Article
Title: Otolith morphometrics and population structure of Pacific sardine (Sardinops sagax) along the west coast of North America
Personal Creator/Author:
CreatorsEmail
Javor, Barbara
Lo, Nancy
Vetter, Russ
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 109
Number: 4
Page Range: pp. 402-415
Date: 2011
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8700
Depositing User: Patti M. Marraro
Date Deposited: 07 Jun 2012 14:51
Last Modified: 07 Jun 2012 14:51
URI: http://aquaticcommons.org/id/eprint/8700

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