How do the organic and mineral fractions drive the opacity of fish otoliths? Insights using Raman microspectrometry

Abstract : We investigated the relationships between the opacity and the physico-chemical characteristics of fish otoliths and more specifically their aragonite and organic fractions. The analysis of these two fractions on otolith macrostructures was performed using Raman microspectrometry on both translucent and opaque zones of otoliths of pollock (Pollachius virens) and European hake (Merluccius merluccius). The magnitude of the Raman signatures of the aragonite and organic fractions were strongly correlated to otolith opacity with maxima in translucent zones. Opacity models, built from Raman signatures, successfully predicted the observed opacity for both species. A partial decorrelation of different aragonite signatures between translucent and opaque zones was revealed and discussed in terms of organisation (size, orientation) of aragonite crystals. Two categories of organic signatures with opposite effects on the opacity were identified, suggesting differences in organic compounds and (or) variations in their relative quantities. These original contributions provided new insight for understanding otolith biomineralization mechanisms as well as for interpreting and discriminating otolith macrostructures.
Type de document :
Article dans une revue
Canadian Journal of Fisheries and Aquatic Sciences, NRC Research Press, 2013, 70 (5), pp.711-719. 〈10.1139/cjfas-2012-0298〉
Liste complète des métadonnées

http://hal.univ-brest.fr/hal-00833916
Contributeur : Adminhal Univbrestbu <>
Soumis le : jeudi 13 juin 2013 - 16:58:46
Dernière modification le : mercredi 11 juillet 2018 - 07:50:18

Identifiants

Citation

Aurélie Jolivet, J.-F. Bardeau, Ronan Fablet, Yves-Marie Paulet, Hélène De Pontual. How do the organic and mineral fractions drive the opacity of fish otoliths? Insights using Raman microspectrometry. Canadian Journal of Fisheries and Aquatic Sciences, NRC Research Press, 2013, 70 (5), pp.711-719. 〈10.1139/cjfas-2012-0298〉. 〈hal-00833916〉

Partager

Métriques

Consultations de la notice

805