Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation
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Author
Artetxe-Arrate, I.Fraile, I.
Farley, J.
Darnaude, A.M.
Clear, N.
Rodríguez-Ezpeleta, N.
Dettman, D.L.
Pécheyran, C.
Krug, I.
Médieu, A.
Ahusan, M.
Proctor, C.
Priatna, A.
Lestari, P.
Davies, C.
Marsac, F.
Murua, H.
Affiliation
Environmental Isotope Laboratory, Department of Geosciences, University of ArizonaIssue Date
2021
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Artetxe-Arrate, I., Fraile, I., Farley, J., Darnaude, A. M., Clear, N., Rodríguez-Ezpeleta, N., ... & Murua, H. (2021). Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation. Plos one, 16(3), e0249327.Journal
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Copyright © 2021 Artetxe-Arrate et al. This is an open access article distributed under the terms of the Creative Commons Attribution License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The chemical composition of otoliths (earbones) can provide valuable information about stock structure and connectivity patterns among marine fish. For that, chemical signatures must be sufficiently distinct to allow accurate classification of an unknown fish to their area of origin. Here we have examined the suitability of otolith microchemistry as a tool to better understand the spatial dynamics of skipjack tuna (Katsuwonus pelamis), a highly valuable commercial species for which uncertainties remain regarding its stock structure in the Indian Ocean. For this aim, we have compared the early life otolith chemical composition of youngof-the-year (<6 months) skipjack tuna captured from the three main nursery areas of the equatorial Indian Ocean (West, Central and East). Elemental (Li:Ca, Sr:Ca, Ba:Ca, Mg:Ca and Mn:Ca) and stable isotopic (δ13C, δ18O) signatures were used, from individuals captured in 2018 and 2019. Otolith Sr:Ca, Ba:Ca, Mg:Ca and δ18O significantly differed among fish from different nurseries, but, in general, the chemical signatures of the three nursery areas largely overlapped. Multivariate analyses of otolith chemical signatures revealed low geographic separation among Central and Eastern nurseries, achieving a maximum overall random forest cross validated classification success of 51%. Cohort effect on otolith trace element signatures was also detected, indicating that variations in chemical signatures associated with seasonal changes in oceanographic conditions must be well understood, particularly for species with several reproductive peaks throughout the year. Otolith microchemistry in conjunction with other techniques (e.g., genetics, particle tracking) should be further investigated to resolve skipjack stock structure, which will ultimately contribute to the sustainable management of this stock in the Indian Ocean. Copyright © 2021 Artetxe-Arrate et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Note
Open access journalISSN
1932-6203PubMed ID
33780495Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1371/journal.pone.0249327
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Except where otherwise noted, this item's license is described as Copyright © 2021 Artetxe-Arrate et al. This is an open access article distributed under the terms of the Creative Commons Attribution License.
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