Unsupervised estimation of the age at sea departure of Atlantic salmon using magnesium, manganese, and zinc otolith chemistry

Abstract Investigating the age at sea departure of returning Atlantic salmon is critical to better understand the role of emigration timing in survival. Among the methods available, the use of otolith chemistry can be challenging in anadromous fish, as the elements frequently used (i.e., magnesium,...

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Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Fontaine, Anthony, Vignon, Matthias, Tabouret, Hélène, Pécheyran, Christophe, Bareille, Gilles
Other Authors: Fondation Pour La Conservation Du Saumon Atlantique, Office Français de la Biodiversité, Université de Pau et des Pays de l'Adour
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2024
Subjects:
Atlantic salmon
Online Access:http://dx.doi.org/10.1111/jfb.15829
https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.15829
Description
Summary:Abstract Investigating the age at sea departure of returning Atlantic salmon is critical to better understand the role of emigration timing in survival. Among the methods available, the use of otolith chemistry can be challenging in anadromous fish, as the elements frequently used (i.e., magnesium, manganese, and zinc) can jointly reflect individual metabolism and environmental conditions. Here, we present a new unsupervised and robust method for successfully estimating the outmigration age of Atlantic salmon in the Bay of Biscay, based on otolith zinc concentrations.

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