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| Registros recuperados: 858 | |
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| Geret, F; Cosson, Rp. |
| Heavy metals (Cd, Cu, Hg and Zn) and metallothionein levels were determined in oysters Crassostrea gigas from two sites: the Gironde Estuary (contaminated site) and Bourgneuf Bay (uncontaminated site). Metallothionein levels led us to suspect the presence of cadmium in the environment when quantified in the gills. Soluble cadmium and metallothioneins were positively correlated in the digestive gland of oysters from Gironde (contaminated site), but metallothionein levels in this organ were not significantly different from levels observed in the digestive gland of oysters from Bourgneuf Bay (uncontaminated site). Conversely, no correlation was noticed between metals and metallothioneins in the gills of oysters from Gironde despite metallothionein levels... |
| Tipo: Text |
Palavras-chave: Métallothionéines; Métaux; Crassostrea gigas; Biomarqueur; Metallothioneins; Metals; Crassostrea gigas; Biomarker. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00324/43561/44058.pdf |
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| Boudry, Pierre; Launey, Sophie; Huvet, Arnaud. |
| The two common oyster species cultivated in Europe are the flat oyster Ostrea edulis and the cupped oyster Crassostrea gigas. These species have two really different reproduction strategies (oviparity versus larviparity) and histories (natural distribution versus introductions linked to oyster culture). We used microsatellite markers to compare the observed variabilities Europe wide. O. edulis presents a lower rate of alleles per locus than C. gigas. The observed structuration levels (global Fst and by pairs values) are similar for both species, but the spatial organisation of the diversity is different. In O. edulis, appears a differentiation based on the distance (concordance of the results with those obtained with the allozymes) whereas in C. gigas,... |
| Tipo: Text |
Palavras-chave: Différenciation génétique; Variabilité; Génétique; Crassostrea gigas; Ostrea edulis; Huîtres. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/acte-3455.pdf |
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| Arzul, Isabelle. |
| Au cours de l'été 1991, d'importantes mortalités de larves d'huître creuse, Crassostrea gigas, ont été observées dans des écloseries, simultanément en France (Comps et Cochennec, 1993) et en Nouvelle-Zélande (Hine & al., 1992). Les examens histologiques ainsi que des examens réalisés en microscopie électronique à transmission d'échantillons de larves présentant des mortalités ont permis de détecter la présence de particules virales associées à des lésions cellulaires. D'après la morphologie, la taille, les localisations intranucléaires et cytoplasmiques du virus, il est possible d'envisager son appartenance à la famille des Herpesviridae. De nouvelles mortalités sporadiques ont été observées au cours des étés suivants sur des lots de larves élevées... |
| Tipo: Text |
Palavras-chave: Virus; Herpesviridae; Bivalve; Crassostrea gigas; Etiologie; Epidémiologie; Diagnostic; Reproduction infection. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00106/21711/19289.pdf |
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| Bacher, Cedric. |
| A model coupling biological and hydrodynamical processes is used in order to study the influence of the amount of cultivated oysters (Crassostrea gigas) on growth performance in the Bay of Marennes-Oléron. The model is based on an energetic budget equation of a mean oyster and on a transport equation of particulate organic and inorganic matter through 12 spatial boxes. Sensitivity analysis is performed and allows computation of the impact of the distribution of oysters among the boxes on the growth performance of a mean oyster in each box. Il is shown that, mainly in the south of the bay, individual growth is affected by the increase in the stock. The same approach also shows that the response of individual growth to the amount of natural benthic... |
| Tipo: Text |
Palavras-chave: Modélisation; Modéle croissance; Compétiteurs; Crassostrea gigas; Stocks huîtres. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/publication-3053.pdf |
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| Goyard, Emmanuel. |
| The Aquaculture Resources department Mollusc Network (REMORA ) has been monitoring in 1994 like in 1993 the growth of homogeneous batches of Crassostrea gigas (initially 18 months old, same origin, same history, same size) in the main French production areas. The monitored parameters deal with growth, morphology, survival, composition and parasite infestations. The comparison between two rearing conditions (traditional bags versus wooden plate to which individuals were stuck) demonstrated like in 1993 improved growth rate (which could also be explained by the lower local density) and a tendency for the oysters to become wider on plates (which is probably related to the absence of shell erosion). Major regional characteristics are revealed by the analysis,... |
| Tipo: Text |
Palavras-chave: Growth; Crassostrea gigas; Cupped oyster; Oyster culture; Monitoring network; Croissance; Crassostrea gigas; Huître creuse; Ostréiculture; Réseau. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/1996/rapport-1650.pdf |
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| Bouilly, Karine; Bonnard, Marc; Grouhel, Stephanie; Lapegue, Sylvie. |
| Divers travaux menés depuis 1984 montrent qu’il existe, chez l’huître creuse Crassostrea gigas, des cellules présentant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Or, une corrélation négative entre l’aneuploïdie somatique et le taux de croissance a été décrite à de nombreuses reprises (Thiriot-Quiévreux et al., 1988, 1992 ; Leitão et al., 2001a ; Zouros et al., 1996). Bien que les causes environnementale et /ou génétique de l’aneuploïdie restent encore largement inconnues, des études récentes ont permis de poser l’hypothèse d’une base génétique large dans la détermination de ce caractère (Leitão et al., 2001b). De plus, un effet toxique direct de l’atrazine (herbicide couramment utilisé dans la région) sur le génome d’une... |
| Tipo: Text |
Palavras-chave: Génétique; Chromosomes; Aneuploïdie; Huîtres creuses; Crassostrea gigas. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00044/15476/12855.pdf |
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| Renault, Tristan; Berthe, Franck; Chollet, Bruno; Cochennec, Nathalie; Haffner, Philippe; Le Deuff, Rose-marie; Lipart, Cecile; Thebault, Anne. |
| Le but de ce programme pathologie est de rechercher et d'étudier les agents pathogènes connus et inconnus chez les mollusques bivalves marins, plus particulièrement chez l'huître creuse, Crassostrea gigas, afin d'identifier d'éventuels agents causant des mortalités, de proposer des mesures prophylactiques et de définir des conditions zootechniques permettant aux professionnels de limiter l'impact des maladies sur leur cheptel. La présence de maladies, chez les mollusques bivalves marins dont l'impact socio économique peut être catastrophique pour les productions conchylicoles, et l'accroissement des échanges de produits d'aquaculture entre les pays de la CEE et avec les pays tiers nécessitent le renforcement des recherches dans les domaines de la... |
| Tipo: Text |
Palavras-chave: Pathologie; Pathogènes; Virus; Herpès virus; Crassostrea gigas; Diagnostic; Herpesviridae. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00043/15452/12827.pdf |
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| Burge, Colleen; Judah, Linda; Conquest, Loveday; Griffin, Frederick; Cheney, Daniel; Suhrbier, Andrew; Vadopalas, Brent; Olin, Paul G.; Renault, Tristan; Friedman, Carolyn S.. |
| Summer seed mortality (SSM) has occurred yearly in Tomales Bay, California since 1993. SSM has resulted in up to 90% cumulative losses, and has been associated with extreme temperature, phytoplankton blooms, and an oyster herpesvirus. In this study, three stocks of Pacific oysters were planted at three sites in California (Inner Tomales Bay, Outer Tomales Bay, and Bodega Harbor) in October of 2000 (Fall) and April of 2001 (Spring) and monitored for mortality, growth, and health status. In April of 2001, a similar study was conducted in Totten Inlet, WA state using cohorts of oysters planted in California; animals were monitored for mortality and growth. Temperature data were collected at all sites; phytoplankton abundance data were collected at the... |
| Tipo: Text |
Palavras-chave: California; Tomales Bay; Oyster herpesvirus; Temperature; Mortality; Crassostrea gigas; Pacific oysters. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2976.pdf |
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| Heral, Maurice; Razet, Daniel; Maestrini, Serge; Garnier, Jacqueline. |
| A twice monthly study shows that the major amount of organic material is from detrtic origin, and is brought in winter, when valeus of mineral seston are very high. In the sping time, phytoplancton blooms, do not make up for lack of detritic material where as in the summer, oceanic phytoplancton is composed of important amounts of carbohydrates. Available food is defined as sum of protids, lipids and carbohydrates and mesured in energetic therms. This allows to foretell the amount of food that molluscs ar likely to assimilate. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Nutrition; Matière organique; Crassostrea gigas; Huîtres. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/acte-3003.pdf |
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| Degremont, Lionel; Soletchnik, Patrick; Boudry, Pierre. |
| This study reports mortality under laboratory conditions in unselected controls and two lines of juvenile Pacific oysters Crassostrea gigas, previously selected for their high or low survival in the field during the summer period. Oysters were also deployed in field conditions and mortality between both conditions was then compared. In the laboratory, mortality was observed in all experiments and it always lasted for a week indicating that mortality under laboratory conditions was a short-term event. It was also shown that mortality could be repeated for a batch in several experiments using oysters which never experienced any abnormal mortality. This approach could facilitate further studies to investigate the causes of mortality by allowing repeated... |
| Tipo: Text |
Palavras-chave: Summer mortality; Crassostrea gigas; Laboratory; Field; Oyster; Juvenile. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00013/12432/9228.pdf |
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| Renault, Tristan; Arzul, Isabelle. |
| Crassostrea gigas is increasingly being cultured in a great number of countries from animaIs originally introduced from Japan, and is one of the most exploited bivalve species in the EU (FAO, 1989). Although no serious pathogen was detected previously in Japanese oysters in Europe, mortalities have been observed since the introduction of this bivalve species into the EU. Thus, oyster cultivation may be endangered by the occurrence of epizootics, especially virus diseases, which are considered one of the maj or risks to production. Indeed, mortalities have been described among different species of ostreids and are associated with the presence of viruses belonging to various families. The first description of a virus was reported in adult Eastern oyters,... |
| Tipo: Text |
Palavras-chave: Pathology; Virology; Herpes-like infection; Detection; Diagnosis; Herpesviridae; Oyster; Crassostrea gigas; Mortality. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00044/15536/12915.pdf |
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| Heral, Maurice. |
| Le bassin de Marennes-Oléron, premier bassin ostréicole français est une baie chroniquement en surcharge. Les déficits de croissance et l'accroissement des mortalités non liées à des pathogènes se sont accentués parallèlement aux anomalies climatiques. Les 3 années de sécheresse (1989-1992) ont montré la grande dépendance pour la productivité de cet écosystème, aux apports d'eau douce estivaux, d'où les conflits pour l'usage de l'eau qui sont apparus. Sur le cheptel affaibli du bassin de Marennes-Oléron en 1993 a été identifiée une chlamydie-like qui altère les branchies des huîtres et qui devrait être un élément supplémentaire de fragilisation du cheptel. La conchyliculture en Charente-Maritime regroupe 4 500 conchyliculteurs qui exploitent 2 800... |
| Tipo: Text |
Palavras-chave: Etude de site; Ostréiculture; Eau profonde; Zone de Culture; Huîtres creuses; Crassostrea gigas. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00048/15900/13328.pdf |
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| Degremont, Lionel; Bordeyne, Francois; Yonneau, Caroline; Maurouard, Elise; Nourry, Max. |
| Depuis 2008, les mortalités touchant le naissain Crassostrea gigas sont particulièrement élevées en France (>70%), fragilisant de nombreuses entreprises ostréicoles. Cependant, une voie de sortie de crise proposée dès 2001 est la mise en place de programmes de sélection pour l’amélioration de la survie suite à la mise en évidence de la forte héritabilité de ce caractère au stade naissain chez C. gigas (Dégremont et al., 2007 ; Dégremont et al., 2010a). Ainsi, des familles d’huîtres C. gigas présentant des survies contrastées au stade naissain ont été reproduites et maintenues depuis 2002 par le Laboratoire de Génétique et Pathologie à la station Ifremer de La Tremblade. Ces lots d’huîtres ont été nommés « R » et « S » respectivement pour leur meilleure... |
| Tipo: Text |
Palavras-chave: Génétique; Sélection génétique; Naissain; Huîtres creuses; Crassostrea gigas; Reproduction. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00065/17643/15179.pdf |
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| Batista, Frederico; Boudry, Pierre; Lapegue, Sylvie; Heurtebise, Serge; Monteiro, C. C.. |
| The Portuguese oyster, Crassostrea angulata, was introduced from Portugal to the French Atlantic Coast in the 1860s. C. angulata quickly settled and expanded and leaded to the development of a new aquacultural industry in France. In the late 1960s, mortality associated with the detection of an iridovirus, led to the wipe out of C. angulata from French Atlantic waters and to the massive introduction of C. gigas to sustain production. In Southern Europe, similar symptoms were also observed in natural stocks of C. angulata from Sado River (Portugal) and from the area of Cadiz (Spain). Nowadays, only very few «pure» populations of C. angulata remain in southern Europe. These populations are potentially endangered by the current expansion of C. gigas... |
| Tipo: Text |
Palavras-chave: Selection; Hybridization; Settlement pattern; Population genetic; Genetic; Oysters; Crassostrea angulata; Crassostrea gigas. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3310.pdf |
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| Registros recuperados: 858 | |
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