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Discriminating bluemouth, Helicolenus dactylopterus (Pisces: Sebastidae), stocks in Portuguese waters by means of otolith shape analysis

Published online by Cambridge University Press:  15 December 2010

Ana Neves ,
Vera Sequeira ,
Inês Farias ,
Ana Rita Vieira ,
Rafaela Paiva  and
Leonel Serrano Gordo
Ana Neves*
Affiliation:
Faculdade de Ciências da Universidade de Lisboa, Departamento de Biologia Animal & Centro de Oceanografia, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal
Vera Sequeira
Affiliation:
Faculdade de Ciências da Universidade de Lisboa, Departamento de Biologia Animal & Centro de Oceanografia, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal
Inês Farias
Affiliation:
Unidade de Recursos Marinhos e Sustentabilidade, Instituto de Investigação das Pescas e do Mar (IPIMAR–INRB), Avenida Brasília, 1449–006 Lisboa, Portugal
Ana Rita Vieira
Affiliation:
Unidade de Recursos Marinhos e Sustentabilidade, Instituto de Investigação das Pescas e do Mar (IPIMAR–INRB), Avenida Brasília, 1449–006 Lisboa, Portugal
Rafaela Paiva
Affiliation:
Faculdade de Ciências da Universidade de Lisboa, Departamento de Biologia Animal & Centro de Oceanografia, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal
Leonel Serrano Gordo
Affiliation:
Faculdade de Ciências da Universidade de Lisboa, Departamento de Biologia Animal & Centro de Oceanografia, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal
*
Correspondence should be addressed to: A. Neves, Faculdade de Ciências da Universidade de Lisboa, Departamento de Biologia Animal & Centro de Oceanografia, Bloco C2, Campo Grande, 1749-016 Lisboa, Portugal email: ananeves73@gmail.com
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Abstract

The understanding of the stock structure of a species is essential to effectively manage fisheries. Otolith shape analysis has been successfully applied in stock identification using the elliptic Fourier analysis. This method was used to assess possible differences in the otolith shape of Helicolenus dactylopterus caught around the Azores, Madeira and mainland Portugal. A total of 294 individuals ranging from 23 to 29 cm in total length, equally distributed by sex and area, were analysed. The multivariate analysis of variance performed on the otolith normalized elliptic Fourier descriptors (NEFDs) revealed significant differences for both area and sex, but no interaction was found between the two factors. In the canonical discriminant analysis an overall classification success of 69.4% and 66.7% was achieved for females and males respectively. These results suggest the usefulness of otolith shape analysis for stock differentiation of bluemouth from Portuguese waters.

Keywords

bluemouthHelicolenus dactylopteruselliptical Fourier analysisnorth-east Atlanticotolithshape analysisstock discrimination
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Special Issue 6: Fish Ecology , September 2011 , pp. 1237 - 1242
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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