Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean
Yellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ<sup>18</sup>O values of young-of-the-year fish from known nursery areas of the equatorial Indian Ocean (West, Central and East)...
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doaj-8c9665b005164425aff2f4dc999b61e32021-09-26T00:53:21ZengMDPI AGOceans2673-19242021-07-0122646147610.3390/oceans2030026Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian OceanIraide Artetxe-Arrate0Igaratza Fraile1Jessica Farley2Audrey M. Darnaude3Naomi Clear4David L. Dettman5Campbell Davies6Francis Marsac7Hilario Murua8AZTI, Marine Research, Basque Research and Technology Alliance (BRTA), 20110 Pasaia, Gipuzkoa, SpainAZTI, Marine Research, Basque Research and Technology Alliance (BRTA), 20110 Pasaia, Gipuzkoa, SpainCSIRO Oceans and Atmosphere, Hobart, Tasmania 7000, AustraliaMarbec, University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, FranceCSIRO Oceans and Atmosphere, Hobart, Tasmania 7000, AustraliaEnvironmental Isotope Laboratory, Department of Geosciences, University of Arizona, Tucson, AZ 85721, USACSIRO Oceans and Atmosphere, Hobart, Tasmania 7000, AustraliaMarbec, University Montpellier, CNRS, Ifremer, IRD, 34203 Sete, FranceInternational Seafood Sustainability Foundation, Washington, DC 20005, USAYellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ<sup>18</sup>O 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 δ<sup>18</sup>O values from Reunion Island were similar to the West nursery signature, but otolith δ<sup>18</sup>O values of sub-adults from Pakistan were unlike any of the nurseries sampled. Therefore, δ<sup>18</sup>O 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.https://www.mdpi.com/2673-1924/2/3/26oxygen isotope analysisotolith chemistryyellowfin tunaSIMSstock structureconnectivity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Iraide Artetxe-Arrate Igaratza Fraile Jessica Farley Audrey M. Darnaude Naomi Clear David L. Dettman Campbell Davies Francis Marsac Hilario Murua |
spellingShingle |
Iraide Artetxe-Arrate Igaratza Fraile Jessica Farley Audrey M. Darnaude Naomi Clear David L. Dettman Campbell Davies Francis Marsac Hilario Murua Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean Oceans oxygen isotope analysis otolith chemistry yellowfin tuna SIMS stock structure connectivity |
author_facet |
Iraide Artetxe-Arrate Igaratza Fraile Jessica Farley Audrey M. Darnaude Naomi Clear David L. Dettman Campbell Davies Francis Marsac Hilario Murua |
author_sort |
Iraide Artetxe-Arrate |
title |
Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean |
title_short |
Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean |
title_full |
Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean |
title_fullStr |
Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean |
title_full_unstemmed |
Otolith δ<sup>18</sup>O Composition as a Tracer of Yellowfin Tuna (<i>Thunnus albacares</i>) Origin in the Indian Ocean |
title_sort |
otolith δ<sup>18</sup>o composition as a tracer of yellowfin tuna (<i>thunnus albacares</i>) origin in the indian ocean |
publisher |
MDPI AG |
series |
Oceans |
issn |
2673-1924 |
publishDate |
2021-07-01 |
description |
Yellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ<sup>18</sup>O 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 δ<sup>18</sup>O values from Reunion Island were similar to the West nursery signature, but otolith δ<sup>18</sup>O values of sub-adults from Pakistan were unlike any of the nurseries sampled. Therefore, δ<sup>18</sup>O 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. |
topic |
oxygen isotope analysis otolith chemistry yellowfin tuna SIMS stock structure connectivity |
url |
https://www.mdpi.com/2673-1924/2/3/26 |
work_keys_str_mv |
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