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Assessment of sea bass (Dicentrarchus labrax, L.) stock delimitation in the Bay of Biscay and the English Channel based on mark-recapture and genetic data ArchiMer
Fritsch, Manon; Morizur, Yvon; Lambert, E; Bonhomme, Francois; Guinand, B.
Sea bass (Dicentrarchus labrax) fisheries are becoming increasingly abundant along eastern Atlantic coastlines, especially in the ICES sub-areas IV, VII and VIII, but they are still not being managed by the European Union TAC (Total Allowed Catches) system. Scientific information about these sea bass stocks is limited, but the fishery is currently managed or modelled based upon these data, separated into the ICES divisions. Clearly, failure to manage satisfactorily the fishery may lead to a decline in stocks. We therefore investigated the structure of Atlantic sea bass populations at eight microsatellite loci in the Bay of Biscay and the English Channel and, additionally, at five selected loci in Ireland and Scotland. Genetic data showed no significant...
Tipo: Text Palavras-chave: Population structure; Microsatellite loci; Tagging; Mark recapture; Dicentrarchus labrax.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2401.pdf
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Genetic structure of the common sole (Solea solea) in the Bay of Biscay: Nurseries as units of selection? ArchiMer
Guinand, B; Rolland, Jean-luc; Bonhomme, Francois.
Coastal and estuarine areas in the Bay of Biscay are essential nursery habitats for sole (Solea solea). Using three intronic markers, we investigated patterns of genetic differentiation among cohorts of juveniles (0+, 1+, sub-adults) inhabiting four major nurseries in the Vilaine and Loire river estuaries, the Pertuis d' Antioche strait, and the Gironde estuary. Genetic differentiation was not significant for the age 0- and 1-groups, but was among sub-adult samples (theta(WC) = 0.017; P = 0.031). Hierarchical analyses of genotypic frequencies by nested multivariate ANOVA using redundancy analysis indicated that northern nurseries of Loire and Vilaine rivers had different patterns of genotypic variation with age than southern nurseries of the Pertuis d'...
Tipo: Text Palavras-chave: Selection; Genetic drift; EPIC PCR; Population genetics; Coastal nurseries; Juveniles; Flatfish.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4299.pdf
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Molecular characterisation of prolactin and analysis of extrapituitary expression in the European sea bass Dicentrarchus labrax under various salinity conditions ArchiMer
Boutet, Isabelle; Lorin Nebel, C; De Lorgeril, Julien; Guinand, B.
dAlthough prolactin has been demonstrated to be the main hormone involved in adaptation to dilute media in several freshwater teleosts, few studies have been conducted in marine teleosts. In the Mediterranean, the sea bass Dicentrarchus labrax inhabits environments ranging from the open sea to coastal lagoons, where salinity varies greatly. We characterised the prolactin (prl) gene and analysed its expression in two organs (gill and intestine) in D. labrax acclimated to either freshwater or seawater. A 2819 bp long sequence encompassing the prl gene and a part (282 bp) of the promoter were identified, and these comprised 5 coding exons separated by 4 introns. Prolactin was similarly expressed in fresh- and seawater adapted fish, although expression in...
Tipo: Text Palavras-chave: Prolactin; Phylogenctic analysis; MRNA expression; Osmoregulation; Intestine; Gill; Dicentrarchuslabrax.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2537.pdf
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