Migration history of an ariid Indian catfish reconstructed by otolith Sr/Ca and δ¹⁸O micro-analysis

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  • Kubota Kaoru
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Yokoyama Yusuke
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo Japan Agency for Marine-Earth Science and Technology
  • Kawakubo Yuta
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Seki Arisa
    Atmosphere and Ocean Research Institute, The University of Tokyo Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Sakai Saburo
    Japan Agency for Marine-Earth Science and Technology
  • Ajithprasad P.
    Department of Archaeology and Ancient History, Maharaja Sayajirao University of Baroda
  • Maemoku Hideaki
    Department of Geography, Hosei University
  • Osada Toshiki
    Research Institute for Humanity and Nature (Emeritus)
  • Bhattacharya S. K.
    Research Center for Environmental Changes, Academia Sinica

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  • Migration history of an ariid Indian catfish reconstructed by otolith Sr/Ca and <i>δ</i><sup>18</sup>O micro-analysis

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Understanding catfish ecology is important because catfish constitute one of the largest fish stocks in the coastal Indo-Pacific regions. Recent technological advances have enabled the use of biological electric sensors to understand fish ecology, but their application requires catch and release. Fish otoliths can record ecological changes, and oxygen isotopes and Sr/Ca ratios along the growth direction are independently used to reconstruct the migration history of the fish. Here we report high-resolution measurements of both oxygen isotopes and Sr/Ca ratios of a modern otolith from a marine catfish (Plicofollis tenuispinis) collected from the Gulf of Khambhat, western India. Both sets of data suggest that the catfish migrated from an estuarine environment to the sea during its lifetime. Migration history of the catfish was estimated with monthly resolution aided by numerical modeling. Potential applications of this analysis as an environmental recorder for variables such as temperature and water chemistry are examined.

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