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

Iraide Artetxe-Arrate (1) , Igaratza Fraile , Jessica Farley , Audrey M. Darnaude (2) , Naomi Clear , Naiara Rodríguez-Ezpeleta , David L Dettman , Christophe Pécheyran (3) , Iñigo Krug , Anaïs Médieu , Mohamed Ahusan , Craig Proctor , Asep Priatna , Pratiwi Lestari , Campbell Davies , Francis Marsac , Hilario Murua

1 AZTI - Tecnalia
2 UMR MARBEC - MARine Biodiversity Exploitation and Conservation
3 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

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

Domaines: Matériaux; Polymères; Chimie théorique et/ou physique; Chimie analytique

Iraide Artetxe-Arrate, Igaratza Fraile, Jessica Farley, Audrey M. Darnaude, Naomi Clear, et al.. Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean: First insights into stock structure delineation. PLoS ONE, 2021, 16 (3), pp.e0249327. ⟨10.1371/journal.pone.0249327⟩. ⟨hal-03195755⟩