La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A Comparison of Otolith Geochemistry and Stable Isotope Markers to Track Fish Movement: Describing Estuarine Ingress by Larval and Post-larval Halibut
Auteurs :	F. Joel Fodrie, Auteur ; Sharon Z. Herzka, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(5) SEP 2013)
Article en page(s) :	906-917
Résumé :	Estuarine recruitment of fishes is a potential bottleneck in the life cycle of many coastal species. We investigated patterns of size-at-ingress for larval and post-larval California halibut entering the Punta Banda Estuary (PBE), Mexico, using both otolith geochemistry and carbon stable isotope ratios (SIR). Juvenile halibut (n = 126; 38-163 mm standard length [SL]) were collected from inside PBE and the adjacent exposed coast during the fall of 2003, and otoliths (geochemistry) and muscle tissues (SIR) were analyzed to reconstruct the environmental histories of individuals. Based on geochemical analyses, nearly all fish collected from PBE were characterized by a non-estuarine signature (e.g., low Mn and Ba) in the otolith growth bands deposited when fish were > 8-12 mm SL), although size-at-ingress estimates were significantly larger (mean difference = 27 mm; p

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