title: Migratory behavior, metabolism, oxidative stress and mercury concentrations in marine and estuarine European glass eels (Anguilla anguilla).
abstract: The relationships between the migratory behavior, methylmercury (MeHg) concentrations, oxidative stress response and detoxification processes were investigated in glass eels collected in marine (Molliets) and estuarine (Urt) waters (Adour estuary, South West France) at the end of the fishing season (April). Glass eel migratory behavior was investigated in an experimental flume according to their response to dusk. Fish responding to the decrease in light intensity by ascending in the water column and moving with or against the flow were considered as having a high propensity to migrate (migrant). Glass eels still sheltering at the end of the 24h catching period were considered as having a low propensity to migrate and were called non-migrant. Our results provide some evidence that estuarine glass eels were bigger, presented a higher propensity to migrate and a lower oxidative stress response than marine glass eels. This might reflect a selection process, some marine glass eels progressively settling or dying before reaching Urt and/or a change in feeding behavior. In April, glass eels restart feeding in the Adour estuary which might decrease the oxidative stress possibly related to starvation, and enhance migration. MeHg concentrations was significantly higher in non-migrant than in migrant glass eels and it is suggested that non-migrant glass eels might present a higher vulnerability to stress (at least contamination and/or starvation), although the underlying mechanisms remain to be elucidated.
authors.affiliation: INRA, UMR 1224 Ecobiop, Aquapôle, 64310 Saint Pée sur Nivelle, France; Université de Pau et des Pays de L'Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques côte Basque, Anglet, France. Electronic address: valerie.bolliet@inra.fr.
authors.forename: Valérie
authors.initials: V
authors.lastname: Bolliet
authors.affiliation: INRA, UMR 1224 Ecobiop, Aquapôle, 64310 Saint Pée sur Nivelle, France; Université de Pau et des Pays de L'Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques côte Basque, Anglet, France. Electronic address: julie.claveau@inra.fr.
authors.forename: Julie
authors.initials: J
authors.lastname: Claveau
authors.affiliation: INRA, UMR 1224 Ecobiop, Aquapôle, 64310 Saint Pée sur Nivelle, France; Université de Pau et des Pays de L'Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques côte Basque, Anglet, France. Electronic address: marc.jarry@univ-pau.fr.
authors.forename: Marc
authors.initials: M
authors.lastname: Jarry
authors.affiliation: Univ. Bordeaux, UMR CNRS 5805 EPOC, Team Aquatic Ecotoxicology, Place du Dr Peyneau, 33120 Arcachon, France. Electronic address: patrice.gonzalez@u-bordeaux.fr.
authors.forename: Patrice
authors.initials: P
authors.lastname: Gonzalez
authors.affiliation: Univ. Bordeaux, UMR CNRS 5805 EPOC, Team Aquatic Ecotoxicology, Place du Dr Peyneau, 33120 Arcachon, France. Electronic address: magalie.baudrimont@u-bordeaux.fr.
authors.forename: Magalie
authors.initials: M
authors.lastname: Baudrimont
authors.affiliation: Université de Pau et des Pays de L'Adour, UMR 1224 Ecobiop, UFR Sciences et Techniques côte Basque, Anglet, France; Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, A Pau, France. Electronic address: mathilde.monperrus@univ-pau.fr.
authors.forename: Mathilde
authors.initials: M
authors.lastname: Monperrus
mesh_terms: D000704:Analysis of Variance; D000811:Anguilla / Q000378:metabolism; D025041:Animal Migration / Q000187:drug effects*; D000818:Animals; D063366:Estuaries; D015870:Gene Expression / Q000187:drug effects*; D008628:Mercury / Q000378:metabolism / Q000633:toxicity*; D008668:Metallothionein / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects*; D010101:Oxygen Consumption / Q000187:drug effects*; D012333:RNA, Messenger / Q000378:metabolism; D012621:Seasons; D013045:Species Specificity
chemical_list: D012333:RNA, Messenger; D008668:Metallothionein; D008628:Mercury
keywords: Anguilla anguilla; Glass eels; Mercury; Metabolism; Migration; Migratory behavior; Oxidative stress response