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ICES Journal of Marine Science: Journal du Conseil 2004 61(1):113-126; doi:10.1016/j.icesjms.2003.10.002
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Stock structure of Sebastes mentella in the North Atlantic revealed by chemometry of the fatty acid profile in heart tissue

Hóraldur Joensen* and Otto Grahl-Nielsen

Department of Chemistry, University of Bergen N-5007 Bergen, Norway

*Correspondence to H. Joensen; Fisheries Laboratory of the Faroe Islands, Nóatún 1, 100 Tórshavn, Faroe Islands; tel: +298 315092; fax: +298 318264. e-mail: horaldj{at}frs.fo.

Chemometric analysis of fatty acid profile in the heart tissue of redfish (Sebastes mentella, Travin 1951) from 11 locations in the waters off Norway, Faroe Islands, Iceland, and from two strata at different depths in the Irminger Sea revealed the presence of four separate stocks in the North Atlantic Ocean. The investigation has, statistically, shown: (i) a clear distinction between S. mentella on the Faroe Plateau and S. mentella in the deeps south-west of the Faroe Bank and on the Wyville Thomson Ridge; (ii) a relationship between S. mentella inhabiting the Faroe Plateau and the Norwegian Sea; and (iii) two significantly distinct stocks of S. mentella dwelling on the Icelandic Plateau. The chemometric method, consisting of methanolysis, gas chromatography of the resulting fatty acid methyl esters, and multivariate statistical treatment of the analytical data, has a discriminating power high enough to differentiate at stock level and individual level.

Keywords: discrimination, fatty acid profile, heart tissue, North Atlantic, principal component analysis, Sebastes mentella, stocks

Received 7 January 2002; accepted 1 October 2003.


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