Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation

Type Article
Date 2021-03
Language English
Author(s) Artetxe-Arrate IraideORCID1, Fraile Igaratza1, Farley JessicaORCID2, Darnaude Audrey M.ORCID3, Clear Naomi2, Rodríguez-Ezpeleta Naiara1, Dettman David L.4, Pécheyran Christophe5, Krug Iñigo1, Médieu AnaisORCID6, Ahusan Mohamed7, Proctor Craig2, Priatna Asep8, Lestari Pratiwi8, Davies Campbell2, Marsac Francis9, Murua HilarioORCID10
Affiliation(s) 1 : AZTI, Marine Research, Basque Research and Technology Alliance (BRTA), Pasaia, Gipuzkoa, Spain
2 : CSIRO Oceans and Atmosphere, Hobart, Tasmania, Australia
3 : Marbec, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
4 : Environmental Isotope Laboratory, Department of Geosciences, University of Arizona, Tucson, Arizona, United States of America
5 : Universite´ de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Pau, France
6 : Marbec, Univ Montpellier, CNRS, Ifremer, IRD, Victoria, Seychelles
7 : Maldives Marine Research Institute, Ministry of Fisheries, Marine Resources and Agriculture, Male, Maldives
8 : Research Institute for Marine Fisheries, Jakarta, Indonesia
9 : Marbec, Univ Montpellierm CNRS, Ifremer, IRD, Sète, France
10 : International Seafood Sustainability Foundation, Washington, DC, United States of America
Source PLOS ONE (1932-6203) (Public Library of Science (PLoS)), 2021-03 , Vol. 16 , N. 3 , P. e0249327 (18p.)
DOI 10.1371/journal.pone.0249327
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 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.

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Publisher's official version 18 1 MB Open access
S1 Fig. Back-calculated hatch period. 218 KB Open access
S2 Fig. Chemical analyses location in the otolith. 366 KB Open access
S1 Table. Raw data. 11 KB Open access
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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 (2021). Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation. PLOS ONE, 16(3), e0249327 (18p.). Publisher's official version : https://doi.org/10.1371/journal.pone.0249327 , Open Access version : https://archimer.ifremer.fr/doc/00687/79908/