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Provedor de dados:  ArchiMer
País:  France
Título:  Mercury in blue shark ( Prionace glauca ) and shortfin mako ( Isurus oxyrinchus ) from north-eastern Atlantic: Implication for fishery management
Autores:  Biton-porsmoguer, Sebastian
Banaru, Daniela
Boudouresque, Charles F.
Dekeyser, Ivan
Bouchoucha, Marc
Marco-miralles, Francoise
Lebreton, Benoit
Guillou, Gael
Harmelin-vivien, Mireille
Data:  2018-02
Ano:  2018
Palavras-chave:  Mercury
Pelagic sharks
Blue shark
Shortfin mako
Long-line fishery
NE Atlantic
Resumo:  Pelagic sharks (blue shark Prionace glauca and shortfin mako Isurus oxyrinchus) caught by long-line Spanish and Portuguese fleets in the NE Atlantic, were sampled at Vigo fish market (Spain) for total mercury (Hg) analysis. Hg concentration in white muscle increased with size and weight in both species, but at a higher rate in shortfin mako than in the blue shark. No difference was found with sex, year and season. Spatial variation was observed in the blue shark with higher Hg values in the North of the Azorean archipelago, but not in the shortfin mako. These high-level predators are particularly susceptible to bioaccumulate contaminants (Hg) in their tissues (muscle). However, a significant positive relationship between Hg concentration and trophic level (δ15N) of individuals was observed only in the shortfin mako. Most sharks landed were juveniles which presented Hg concentration lower than the maximum limit allowed by the European Union (1 mg kg− 1 wet weight) for marketing. However, concentrations above this threshold were most recorded in blue sharks larger than 250 cm total length (TL) and in shortfin makos larger than 190 cm TL, raising the question of the commercialization of large-sized individuals.
Tipo:  Text
Idioma:  Inglês

Editor:  Pergamon-elsevier Science Ltd
Formato:  application/pdf
Fonte:  Marine Pollution Bulletin (0025-326X) (Pergamon-elsevier Science Ltd), 2018-02 , Vol. 127 , P. 131-138
Direitos:  2017 Published by Elsevier Ltd.


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