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Article

Otolith δ18O Composition as a Tracer of Yellowfin Tuna (Thunnus albacares) Origin in the Indian Ocean

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AZTI, Marine Research, Basque Research and Technology Alliance (BRTA), 20110 Pasaia, Gipuzkoa, Spain
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CSIRO Oceans and Atmosphere, Hobart, Tasmania 7000, Australia
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Marbec, University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, France
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Environmental Isotope Laboratory, Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
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Marbec, University Montpellier, CNRS, Ifremer, IRD, 34203 Sete, France
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International Seafood Sustainability Foundation, Washington, DC 20005, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Diego Macías
Received: 15 March 2021 / Revised: 2 July 2021 / Accepted: 6 July 2021 / Published: 14 July 2021
Yellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ18O values of young-of-the-year fish from known nursery areas of the equatorial Indian Ocean (West, Central and East) were used to establish a reference isotopic signature to predict the origin of sub-adult and adult individuals. Sub-adult tuna otolith δ18O values from Reunion Island were similar to the West nursery signature, but otolith δ18O values of sub-adults from Pakistan were unlike any of the nurseries sampled. Therefore, δ18O values from the Pakistan area samples were considered an additional nursery source for predicting the origin of adult tuna, using a multinomial logistic regression classification method. The western equatorial area was the most productive nursery for three fishing grounds sampled, with a minor contribution of Pakistan-like origin fish. Contribution of Central or East nurseries to the adult population was negligible. One adult otolith was analysed by secondary ion mass spectrometry along the otolith growth transect and results were compared with an isoscape approach to infer lifetime movements. This study is an important first step towards understanding the spatial structure and connectivity of the species. View Full-Text
Keywords: oxygen isotope analysis; otolith chemistry; yellowfin tuna; SIMS; stock structure; connectivity; Indian Ocean oxygen isotope analysis; otolith chemistry; yellowfin tuna; SIMS; stock structure; connectivity; Indian Ocean
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MDPI and ACS Style

Artetxe-Arrate, I.; Fraile, I.; Farley, J.; Darnaude, A.M.; Clear, N.; Dettman, D.L.; Davies, C.; Marsac, F.; Murua, H. Otolith δ18O Composition as a Tracer of Yellowfin Tuna (Thunnus albacares) Origin in the Indian Ocean. Oceans 2021, 2, 461-476. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030026

AMA Style

Artetxe-Arrate I, Fraile I, Farley J, Darnaude AM, Clear N, Dettman DL, Davies C, Marsac F, Murua H. Otolith δ18O Composition as a Tracer of Yellowfin Tuna (Thunnus albacares) Origin in the Indian Ocean. Oceans. 2021; 2(3):461-476. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030026

Chicago/Turabian Style

Artetxe-Arrate, Iraide, Igaratza Fraile, Jessica Farley, Audrey M. Darnaude, Naomi Clear, David L. Dettman, Campbell Davies, Francis Marsac, and Hilario Murua. 2021. "Otolith δ18O Composition as a Tracer of Yellowfin Tuna (Thunnus albacares) Origin in the Indian Ocean" Oceans 2, no. 3: 461-476. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030026

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