Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 10
Articles | Volume 23, issue 10
https://doi.org/10.5194/bg-23-3605-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3605-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 10
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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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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