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Discrimination of Trisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Published online by Cambridge University Press:  18 March 2011

Diogo Manuel Silva ,
Paulo Santos  and
Alberto Teodorico Correia
Diogo Manuel Silva
Affiliation:
Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Rua dos Bragas 289, 4050-123 Porto, Portugal Faculdade de Ciências da Universidade do Porto (FCUP), Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
Paulo Santos
Affiliation:
Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Rua dos Bragas 289, 4050-123 Porto, Portugal Faculdade de Ciências da Universidade do Porto (FCUP), Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
Alberto Teodorico Correia*
Affiliation:
Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Rua dos Bragas 289, 4050-123 Porto, Portugal Centro Interdisciplinar de Alterações Globais e Bioengenharia (CIAGEB) / Faculdade de Ciências da Saúde da Universidade Fernando Pessoa (FCS-UFP), Rua Carlos Maia, 296, 4200-150 Porto, Portugal
*
a Corresponding author: atcorreia@ciimar.up.pt, acorreia@ufp.edu.pt
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Abstract

The pout, Trisopterus luscus, is one of the most important gadoid fish captured by northern Portuguese traditional fisheries. In spite of a substantial decrease in fish catches, little data are available either on the population structure or on the management of the species. In this study, chemical analysis with inductively coupled plasma mass spectrometry of whole otoliths of 90 pouts (age group 2, total length: 17.9–25.0 cm) provided location-specific elemental signatures. Sampling took place in shallow waters along the coastline in three fishing grounds off the Portuguese north coast (Viana do Castelo, Matosinhos and Aveiro) between February and March 2010. Otolith fingerprint analysis detected the presence of several informative trace elements. Molar concentrations for each site were analysed through uni- and multivariate statistical tests. Strontium, barium, magnesium and lithium (Sr, Ba, Mg and Li) differed significantly among locations, while no significant differences were found for manganese (Mn) and nickel (Ni). Canonical analysis allowed us to discriminate the tested individuals with respect to their sampling origin with a mean classification accuracy of 69%. The observed site-specific elemental differences in pout otoliths suggest a high level of site-fidelity in relation to their growing/feeding areas. Pouts from these locations can be regarded as a single, although not necessary homogenous, stock. Furthermore, this study also suggests that the populations of juvenile fish mix partially and, therefore, cannot be assumed to be separate units for fisheries management purposes.

Keywords

Trisopterus luscusOtolith fingerprintTrace metalStock discriminationNE Atlantic
Type
Brief Report
Information
Aquatic Living Resources , Volume 24 , Issue 1 , January 2011 , pp. 85 - 91
Copyright
© EDP Sciences, IFREMER, IRD 2011

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