Journal Article

Element composition of sardine (<i>Sardina pilchardus</i>) otoliths along the Atlantic Coast of the Iberian Peninsula

B. G. Castro

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 3, pages 512-518
Published in print April 2007 | ISSN: 1054-3139
Published online March 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm017
Element composition of sardine (Sardina pilchardus) otoliths along the Atlantic Coast of the Iberian Peninsula

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Castro, B. G. 2007. Element composition of sardine (Sardina pilchardus) otoliths along the Atlantic Coast of the Iberian Peninsula. – ICES Journal of Marine Science, 64: 512–518.

The element composition of sardine (Sardina pilchardus) otoliths along the Atlantic Coast of the Iberian Peninsula was determined by bulk analysis, using Inductively Coupled Plasma-Mass Spectrometry. Samples (collected 2003–2005) were classified by area [Bay of Biscay (GV), Northwest (OCN), and Southwest (GC) of the Iberian Peninsula] and size group ( ≤ 15, 16–18, and ≥ 21 cm total length). The chemical composition was compared statistically between areas within size groups and between size groups within areas by ANOVA and a Support Vector Machine method, using 10-fold cross-validation. The element composition of sardine otoliths was similar to that of other marine fish. In all, eight elements (Li, Ba, Mg, Mn, Na, Sr, K, and Ca) were useful in discriminating between areas and/or size groups. Discrimination between areas within size groups was less effective for the biggest size group (67%) than for the middle (89%) or smallest size groups (84%). Discrimination between size groups within areas was better for GC (76%) and GV (84%) than for OCN (60%). The results are interpreted in terms of a net balance of migration of large sardine from OCN towards GV and GC.

Keywords: Iberian Peninsula; otolith chemistry; sardine; stock identification

Journal Article.  3800 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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