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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 10, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(3):524-531; doi:10.1093/icesjms/fsp010
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Age and growth of bluemouth, Helicolenus dactylopterus, from the Portuguese continental slope

Vera Sequeira1, Ana Neves1, Ana Rita Vieira1, Ivone Figueiredo2 and Leonel S. Gordo1

1 Faculdade de Ciências de Lisboa, Centro de Oceanografia and Departamento de Biologia Animal, Bloco C2, Campo Grande, 1749–016 Lisboa, Portugal
2 Unidade de Recursos Marinhos e Sustentabilidade, Instituto de Investigação das Pescas e do Mar (IPIMAR–INRB), Avenida Brasília, 1449–006 Lisboa, Portugal

Correspondence to V. Sequeira: tel: +351 217 500824; fax: +351 217 500028; e-mail: vlsequeira{at}fc.ul.pt.

Sequeira, V., Neves, A., Vieira, A. R., Figueiredo, I., and Gordo, L. S. 2009. Age and growth of bluemouth, Helicolenus dactylopterus, from the Portuguese continental slope. – ICES Journal of Marine Science, 66: 524–531.

In all, 933 bluemouth (Helicolenus dactylopterus) were obtained from bottom-trawl research surveys along the Portuguese continental slope between October 2005 and February 2007 and from commercial landings. Age was determined by reading whole sagittal otoliths, and age estimates were validated by daily growth increment (DGI) analysis. Fish ranged from 5.2 to 44.9 cm, which corresponded to fish between 0 and 30 years old. The mean total length obtained from DGI analysis for age class 1 fish was 8.6 cm, corresponding to otoliths with a mean radius of 1.8 mm. As no statistical differences between sex were observed, the von Bertalanffy growth equation fitted was Lt = 45.50[1 – e–0.05(t+4.01)]. Comparisons with other studies using Hotelling's T2 test and the growth perform index (FE) are drawn. The growth rates estimated in this study using whole otolith readings were the lowest of all the studies available, and the estimated L{infty} is lower then those obtained for Azorean waters and higher than those published for the Mediterranean.

Keywords: age, daily growth increment, growth, Helicolenus dactylopterus, otoliths

Received 30 April 2008; accepted 30 December 2008; advance access publication 10 February 2009.


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