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Effects of sex, stock, and environment on the shape of known-age Atlantic cod (Gadus morhua) otoliths

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Abstract:

The effects of sex, stock, and environment on the shape of known-age Atlantic cod (Gadus morhua) otoliths from the Faroe Islands were investigated. Moreover, the feasibility of otolith shape analysis for stock identification was evaluated. The shape was described by using several normalized Fourier descriptors and morphometric variables. There were no consistent differences between the left and right otoliths and between sexes within different age classes, stocks, and environments. With our experimental design, we could evaluate the relative importance of genetic and environmental conditions (water temperature and diet regime) on otolith shape and morphometrics. Using otolith shape, cod individuals were significantly separated into Bank and Plateau stocks. Total classification success was between 79% and 85% between stocks and between 85% and 96% between environments for the different age classes. The significant differences in otolith shape between Faroe Bank and Faroe Plateau cod stocks provided a phenotypic basis for stock separation. Stock and environmental influences were substantial in determining the shape of cod otoliths.

Nous avons examiné les effets du sexe, du stock et du milieu sur la forme de l'otolithe chez des morues franches (Gadus morhua) d'âge connu aux îles Féroé et évalué la valeur de l'analyse de la forme des otolithes pour l'identification des stocks. Plusieurs descripteurs de type Fourier normal et des variables morphométriques ont servi à décrire la forme. Il n'y a pas de différence constante entre les otolithes droits et gauches, ni entre les otolithes des deux sexes à l'intérieur d'une classe d'àge, d'un même stock ou d'un même environnement. Notre plan d'expérience nous permet de distinguer l'influence relative des facteurs génétiques et environnementaux (température de l'eau et régime alimentaire) sur la forme et la morphométrie des otolithes. D'après la forme des otolithes, il est possible de séparer de façon significative les individus des stocks Bank et Plateau. Le succès global de la classification est de 79 % à 85 % entre les stocks et de 85 % à 96 % entre les milieux pour les différentes classes d'âge. Les différences significatives de forme des otolithes des stocks Bank et Plateau de Féroé fournissent une base phénotypique pour la discrimination des stocks. Les influences du stock et de l'environnement sont d'importance dans la détermination de la forme des otolithes chez la morue.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2004

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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