FN Archimer Export Format PT J TI Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation BT AF Artetxe-Arrate, Iraide Fraile, Igaratza Farley, Jessica Darnaude, Audrey M. Clear, Naomi Rodríguez-Ezpeleta, Naiara Dettman, David L. Pécheyran, Christophe Krug, Iñigo Médieu, Anais Ahusan, Mohamed Proctor, Craig Priatna, Asep Lestari, Pratiwi Davies, Campbell Marsac, Francis Murua, Hilario AS 1:1;2:1;3:2;4:3;5:2;6:1;7:4;8:5;9:1;10:6;11:7;12:2;13:8;14:8;15:2;16:9;17:10; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:; C1 AZTI, Marine Research, Basque Research and Technology Alliance (BRTA), Pasaia, Gipuzkoa, Spain CSIRO Oceans and Atmosphere, Hobart, Tasmania, Australia Marbec, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France Environmental Isotope Laboratory, Department of Geosciences, University of Arizona, Tucson, Arizona, United States of America Universite´ de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Pau, France Marbec, Univ Montpellier, CNRS, Ifremer, IRD, Victoria, Seychelles Maldives Marine Research Institute, Ministry of Fisheries, Marine Resources and Agriculture, Male, Maldives Research Institute for Marine Fisheries, Jakarta, Indonesia Marbec, Univ Montpellierm CNRS, Ifremer, IRD, Sète, France International Seafood Sustainability Foundation, Washington, DC, United States of America C2 AZTI, SPAIN CSIRO OCEANS AND ATMOSPHERE, AUSTRALIA UNIV MONTPELLIER, FRANCE UNIV ARIZONA, USA UNIV PAU & PAYS ADOUR, FRANCE IRD, SEYCHELLES MRC, MALDIVES CMFRI, INDONESIA IRD, FRANCE INT SEAFOOD SUSTAINABIL FDN, USA UM MARBEC IN WOS Cotutelle UMR DOAJ copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe copubli-sud IF 3.752 TC 4 UR https://archimer.ifremer.fr/doc/00687/79908/82810.pdf https://archimer.ifremer.fr/doc/00687/79908/82811.tif https://archimer.ifremer.fr/doc/00687/79908/82812.tif https://archimer.ifremer.fr/doc/00687/79908/82813.csv LA English DT Article AB 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 young-of-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. PY 2021 PD MAR SO Plos One SN 1932-6203 PU Public Library of Science (PLoS) VL 16 IS 3 UT 000636336800004 DI 10.1371/journal.pone.0249327 ID 79908 ER EF