Articles | Volume 23, issue 10
https://doi.org/10.5194/bg-23-3605-2026
https://doi.org/10.5194/bg-23-3605-2026
Research article
 | 
27 May 2026
Research article |  | 27 May 2026

Limited iron isotope variation among tissues of a marine fish: a case study of wild chub mackerel (Scomber japonicus)

Nanako Hasegawa, Yoshio Takahashi, and Takaaki Itai

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Cited articles

Abadie, C., Lacan, F., Radic, A., Pradoux, C., and Poitrasson, F.: Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean, P. Natl. Acad. Sci. USA, 114, 858–863, https://doi.org/10.1073/pnas.1603107114, 2017. 
Albalat, E., Cavey, T., Leroyer, P., Ropert, M., Balter, V., and Loréal, O.: Hfe Gene Knock-Out in a Mouse Model of Hereditary Hemochromatosis Affects Bodily Iron Isotope Compositions, Front. Med., 8, 711822, https://doi.org/10.3389/fmed.2021.711822, 2021. 
Albarède, F., Telouk, P., Lamboux, A., Jaouen, K., and Balter, V.: Isotopic evidence of unaccounted for Fe and Cu erythropoietic pathways, Metallomics, 3, 926–933, https://doi.org/10.1039/c1mt00025j, 2011. 
Allaya, H., Hattour, A., Hajjej, G., and Trabelsi, M.: Biologic characteristics of Scomber japonicus (Houttuyn, 1782) in Tunisian waters (Central Mediterranean Sea), Afr. J. Biotechnol., 12, 3040, 2013. 
Andersen, O., Dehli, A., Standal, H., Giskegjerde, T. A., and Karstensen, R., and Rørvik, K. A.: Two ferritin subunits of Atlantic salmon (Salmo salar): cloning of the liver cDNAs and antibody preparation, Mol. Mar. Biol. Biotech., 4, 164–170, 1995. 
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Short summary
Iron stable isotope ratios provide a potential tracer of iron metabolism in fish. Here, we report tissue-specific isotope variations in mackerel and evaluate how storage iron as ferritin affects fractionation using speciation analysis. The results show small isotopic differences among tissues, indicating that isotope ratios are primarily controlled by dietary values and intestinal uptake, highlighting the potential of natural isotope patterns as physiological indicators in fish.
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