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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on December 18, 2006
ICES Journal of Marine Science: Journal du Conseil 2007 64(2):369-376; doi:10.1093/icesjms/fsl033
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© 2006 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Regional variation in maturation of sandeels in the North Sea

Philip Boulcott1,, Peter J. Wright1, Fiona M. Gibb1, Henrik Jensen2 and Iain M. Gibb1

1 Fisheries Research Services, Marine Laboratory, PO Box 101, Victoria Road, Aberdeen AB11 9DB, UK
2 Danish Institute for Fisheries Research, Department of Marine Fisheries, Charlottenlund Castle, DK-2920 Charlottenlund, Denmark

Correspondence to P. Boulcott: tel: +44 131 6513602; fax: +44 131 6506564; e-mail: p.boulcott{at}ed.ac.uk

Boulcott, P., Wright, P. J., Gibb, F. M., Jensen, H., and Gibb, I. M. 2007. Regional variation in maturation of sandeels in the North Sea. – ICES Journal of Marine Science, 64: 369–376.

The current assessment of lesser sandeel (Ammodytes marinus) in the North Sea assumes a single stock and a knife-edge maturity ogive. However, there is evidence that the North Sea stock consists of several reproductively isolated components, raising the possibility of demographic differences among regional aggregations. We examine regional variation in size- and age-at-maturity in four components of the North Sea stock. Surveys in 1999 indicated pronounced regional differences in length- and weight-at-age, implying a disparity in growth rate across the North Sea. Logistic regression revealed that the onset of maturity was significantly related to regional distribution, in addition to length and age, with a tendency for fish off the UK's northeast coast to mature later and smaller than elsewhere. No significant effect of year on either growth or length-at-maturity was revealed from a comparison with other data collected in 2004. The results show that important regional phenotypic variation not currently represented in stock assessments could have implications for the local sustainability of sandeel aggregations.

Keywords: Ammodytes marinus, fecundity, maturation, reproduction, sandeel, stock management

Received 6 June 2006; accepted 17 November 2006; advance access publication 18 December 2006.


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