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Marine Ecology Progress Series

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MEPS 465:217-226 (2012)  -  DOI:

Suitability of otolith microchemistry for stock separation of Baltic cod

F. Heidemann1,*, L. Marohn1,5, H. H. Hinrichsen1, B. Huwer2, K. Hüssy2, A. Klügel3, U. Böttcher4, R. Hanel5

1Helmholtz Centre for Ocean Research Kiel, GEOMAR, Kiel 24105, Germany
2National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund Castle, Charlottenlund 2920, Denmark
3Universität Bremen, Fachbereich Geowissenschaften, Bremen 28334, Germany
4von Thünen-Institut (vTI)—Institute of Baltic Sea Fisheries, Rostock 18069, Germany
5von Thünen-Institut (vTI)—Institute of Fisheries Ecology, Hamburg 22767, Germany

ABSTRACT: Microchemical otolith analyses have been shown to provide valuable information on the life history, dispersal and stock characteristics of teleost fish. In the present study, the suitability of this technique for identifying the origin and distribution of Atlantic cod Gadus morhua L. from the Baltic Sea was examined using laser ablation-ICPMS. The capacity to distinguish individuals from different Baltic Sea stocks and from the adjacent North Sea stock based on incoporation of stock-specific elemental fingerprints along otolith growth axes was investigated. It was further tested if different origins led to spawning-site specific element concentrations in otolith cores. The results indicate that microchemical analyses of Baltic cod otoliths are applicable for differentiating individuals of different stocks. Analyses of similarities including 12 element/calcium ratios resulted in significant differences between individuals from the eastern and the western Baltic Sea and between North Sea and Baltic Sea samples. Sr/Ca, Ba/Ca, Y/Ca, Mg/Ca, Zr/Ca and Mn/Ca ratios had the strongest discriminatory power. A further separation of individuals caught in 3 different spawning grounds of the eastern Baltic, however, was not possible. Elemental compositions from the core regions of otoliths from young of the year cod caught in eastern and western Baltic Sea spawning grounds showed significant differences in Sr/Ca, Ba/Ca and Mg/Ca concentrations. Analyses of similarities again showed significant differences between these areas for juveniles. This study demonstrates the potential of otolith microchemical analyses to provide important information about the stock structure and connectivity of G. morhua in the Baltic Sea.

KEY WORDS: Gadus morhua · Stock discrimination · Baltic Sea · Otolith microchemistry

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Cite this article as: Heidemann F, Marohn L, Hinrichsen HH, Huwer B and others (2012) Suitability of otolith microchemistry for stock separation of Baltic cod. Mar Ecol Prog Ser 465:217-226.

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