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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on June 3, 2008
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsn090
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The use of sagittal otoliths in discriminating stocks of common dolphinfish (Coryphaena hippurus) off northeastern Brazil using multishape descriptors

Paulo Duarte-Neto1, Rosângela Lessa2, Borko Stosic3 and Eric Morize4

1 Unidade Acadêmica de Garanhuns, Universidade Federal Rural de Pernambuco, Rua Bom Pastor s/n, Mundau, Garanhuns – PE CEP 55296-901, Brazil
2 Laboratório de Dinâmica de Populações Marinhas, Departamento de Pesca, Universidade Federal Rural de Pernambuco, Avenida D. Manoel de Medeiros s/n, Dois Irmãos, Recife – PE CEP 52171-900, Brazil
3 Departamento de Estatística e Informática, Universidade Federal Rural de Pernambuco, Avenida D. Manoel de Medeiros s/n, Dois Irmãos, Recife – PE CEP 52171-900, Brazil
4 Laboratoire de Sclérochronologie des Animaux Aquatiques, Institut de Recherche pour le Développement, Centre IRD de Bretagne, BP 70, 29280 Plouzané, France

Correspondence to P. Duarte-Neto: tel: +55 87 37610969; fax: +55 87 37610882; e-mail: pjneto{at}uag.ufrpe.br

Duarte-Neto, P., Lessa, R., Stosic, B., and Morize, E. 2008. The use of sagittal otoliths in discriminating stocks of common dolphinfish (Coryphaena hippurus) off northeastern Brazil using multishape descriptors. – ICES Journal of Marine Science, 65.

The shape of sagittal otoliths from the dolphinfish (Coryphaena hippurus) was studied to test the hypothesis that two stocks exist off the northeast coast of Brazil. In all, 82 sagittal otoliths were collected from fish caught by the artisanal fleet in two coastal regions of northeastern Brazil in December 2003 and April/May 2004. Several shape descriptors were determined [area, perimeter, rectangularity, circularity, eccentricity, fractal dimension (FD), and Fourier coefficients (FCs)] to evaluate the degree of similarity in the otoliths between regions. A three-morphotype pattern was revealed through cluster and principal component analyses based on FCs of the 30th harmonics. Apparently, this pattern is not influenced by clinal factors. Despite the great variability between otolith shapes, separation of the samples from two regions was suggested using multivariate and univariate analyses of variance for all shape descriptors and using canonical discriminant analysis. The methods successfully classified 57.1 and 69.6% of otoliths from the Maranhão and Rio Grande do Norte regions, respectively. The FD was a powerful descriptor in discriminating the two stocks. Differences in the shapes of sagittal otoliths may be related to different growth rates of the species and lend credence to the belief that there are two stocks along the Brazilian coast.

Keywords: Coryphaena hippurus, fish stock, multivariate analysis, otolith shape

Received 13 April 2007; accepted 10 May 2008.


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