Abstract
Bromine was found to accumulate in otoliths of Norwegian coastal Cod Gadus morhua that were reared under known conditions. Despite the fact that the Cod were moved from one rearing environment to another, causing marked changes in some otolith elemental concentrations, bromine appeared to accumulate continuously along certain growth axes as revealed by 2-D elemental mapping. In contrast, North Sea and Baltic Sea Cod showed little to no patterning in Br. We suggest that Br uptake in otoliths may be under physiological and genetic control, and as such, may prove useful as a stock identification tool.
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Acknowledgments
We thank Y. Walther and H. Svedäng, Swedish Fisheries Board, for providing otoliths of Cod from the Baltic and North seas, respectively, and Ø. Karlsen, Institute of Marine Research Norway, for the Norwegian coastal Cod otoliths. We also thank S. Cornaby for producing the glass capillaries used in the analysis. Finally, we thank two anonymous reviewers for constructive criticism of an earlier draft. This work is based upon research conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-0225180. Partial support (to KL) was from NSF grant DEB-0238121.
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Limburg, K.E., Høie, H. & Dale, D.S. Bromine patterns in Norwegian coastal Cod otoliths—a possible marker for distinguishing stocks?. Environ Biol Fish 89, 427–432 (2010). https://doi.org/10.1007/s10641-010-9660-7
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DOI: https://doi.org/10.1007/s10641-010-9660-7