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| Registros recuperados: 858 | |
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| Gueguen, Marielle; Bardouil, Michele; Baron, Regis; Lassus, Patrick; Truquet, Philippe; Massardier, Julie; Amzil, Zouher. |
| Contamination of shellfish by paralytic shellfish poisoning ( PSP) toxins poses an economic threat to shellfish farmers. As contaminated shellfish cannot be harvested for long periods of time, it would be very useful to develop processes to optimise and shorten their detoxification. In this study, Pacific oysters Crassostrea gigas were first experimentally contaminated over a period of 13 days with a continuous flow of toxic Alexandrium minutum cultures at concentrations ranging from 150 to 200 cell ml(-1) ( toxin content after 13 days of contamination 438 mu g STX equiv. 100 g(-1) wet weight). Then, two different detoxification treatments were tested and showed detoxification rates greater than those observed in coastal environments. The first treatment... |
| Tipo: Text |
Palavras-chave: Alexandrium minutum; Crassostrea gigas; Detoxification; Inorganic matter; Organic matter; PSP; Paralytic shellfish poisoning. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3896.pdf |
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| Barille-boyer, Anne-laure; Haure, Joel; Baud, Jean-pierre. |
| The oyster growth has been studied for a 10 year period, from 1986 to 1995, in four locations of the bay of Bourgneuf (French Atlantic Coast). The relations between oysters growth and the main molluscs stocks (cultivated oysters and wild mussels) or environmental factors (hydrobiology, currents, climatology) are analysed to understand the functioning of this shellfish ecosystem. As the water renewal time is about two months, primary production is essentially autochtonal. Phytoplankton development is controlled by the nutrients brought by the river Loire. An important part of the microalgac is composed by the microphytobenthos resuspended by west wind. High seston concentrations, measured on the North of the bay (150 mg/1 as an average), have a negative... |
| Tipo: Text |
Palavras-chave: Ecosystème conchylicole; Modèle global de croissance; Baie de Bourgneuf; Crassostrea gigas; Ecosystem; Shellfish culture; Global growth model; Bay of Bourgneuf; Crassostrea gigas. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/rapport-1633.pdf |
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| Bouilly, Karine; Leitao, Alexandra; Mccombie, Helen; Chaves, R.; Guedes Pinto, H; Boudry, Pierre; Lapegue, Sylvie. |
| In the Pacific oyster, Crassostrea gigas hypodiploid aneuploid cells with 2n=19, 18 or 17 chromosomes have regularly been reported. There is a negative correlation between somatic aneuploidy and growth rate in oysters (Leitão et al., 2001a) as well as evidence for a genetic basis (Leitão et al., 2001b). Furthermore, non-random chromosome loss has been demonstrated in aneuploid karyotypes of C. gigas using the G-banding technique (Leitão et al., 2001c). This poster summarises different studies used to investigate the effects of the herbicide atrazine on the level of aneuploidy in this species |
| Tipo: Text |
Palavras-chave: Genetic; Aneuploidy; Toxicology; Impact; Atrazine; Crassostrea gigas; Pacific oysters. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3489.pdf |
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| Arnaud, Christophe; Faury, Nicole; Bouquet, Jean-paul. |
| The Marennes-Oléron is a well known cupped oyster (Crassostrea gigas) and mussel (Mytilus edulis) reproduction area. Every year, a monitoring of the reproduction of these two species is carried out on behalf of the Regional Shellfish Culture Section of Marennes-Oléron. This monitoring aims to determine the periods of larval emission in order to let the professionals know about the best collection times This study presents the main results obtained in 1999 and compares them with those obtained in 1997 and 1998. The year 1999 showed good results as far as larval emission and development are concerned in both oysters and mussels. The comparison of the three consecutive years shows the disparity of larval evolutions. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Captage; Larves; Mytilus edulis; Moules; Crassostrea gigas; Huîtres; Reproduction. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/rapport-6571.pdf |
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| Dupont, Samuel; Lokmer, A.; Corre, E.; Auguet, Jean-christophe; Petton, Bruno; Toulza, E.; Montagnani, Caroline; Tanguy, G.; Pecqueur, D.; Salmeron, C.; Guillou, L.; Desnues, C.; La Scola, B.; Bou Khalil, J.; De Lorgeril, Julien; Mitta, Guillaume; Gueguen, Yannick; Escoubas, Jean Michel. |
| Background The impact of the microbiota on host fitness has so far mainly been demonstrated for the bacterial microbiome. We know much less about host-associated protist and viral communities, largely due to technical issues. However, all microorganisms within a microbiome potentially interact with each other as well as with the host and the environment, therefore likely affecting the host health. Results We set out to explore how environmental and host factors shape the composition and diversity of bacterial, protist and viral microbial communities in the Pacific oyster hemolymph, both in health and disease. To do so, five oyster families differing in susceptibility to the Pacific oyster mortality syndrome were reared in hatchery and transplanted into a... |
| Tipo: Text |
Palavras-chave: Oyster genetic background; Hemolymph microbiota dynamics; Early-life microbiota; Trans-kingdom interactions; Crassostrea gigas; Within-host ecosystem. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00627/73916/73254.pdf |
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| Degremont, Lionel; Bedier, Edouard; Boudry, Pierre. |
| Response to divergent selection for "high" and "low" survival during the summer period, from July to October, was investigated in juvenile (six-month-old) Pacific oysters, Crassostrea gigas, by producing two sets of progenies in 2002 (Generation 2) and three sets of progenies in 2003 (Generation 3). A strict between-family approach was used and resistance of these selected progenies to summer mortality was assessed in three sites along French coasts, to determine their response to selection and estimate realized heritability of the trait. A significant difference in survival was observed between the "high" and "low" selected groups at all sites for all sets of progenies, indicating a significant genetic component. High realized heritabilities for survival... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Heritability; Juveniles; Summer mortality; Survival; Growth. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6950.pdf |
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| Sussarellu, Rossana; Huvet, Arnaud; Lapegue, Sylvie; Quillen, Virgile; Lelong, Christophe; Cornette, Florence; Jensen, Lasse Fast; Bierne, Nicolas; Boudry, Pierre. |
| Background Originating from Northeast Asia, the Pacific oyster Crassostrea gigas has been introduced into a large number of countries for aquaculture purpose. Following introduction, the Pacific oyster has turned into an invasive species in an increasing number of coastal areas, notably recently in Northern Europe. Methods To explore potential adaptation of reproductive traits in populations with different histories, we set up a common garden experiment based on the comparison of progenies from two populations of Pacific oyster sampled in France and Denmark and their hybrids. Sex ratio, condition index and microarray gene expression in gonads, were analyzed in each progeny (n = 60). Results A female-biased sex-ratio and a higher condition index were... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Adaptation; Invasiveness; Fertility; Sex-ratio; Transcriptome; Microarray. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00287/39829/38343.pdf |
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| Lodato, Marie-isabelle. |
| Face à un problème de mortalité chronique qui touche, depuis 1988, les productions d' huîtres creuses, une stratégie d'échantillonnage a été étudiée afin de quantifier, d'un point de vue spatio·temporelle, les taux de mortalité. L'étude a porté durant 4 mois sur 48 concessions ostréicoles des bancs d' élevage de Ronce et Perquis. Le taux moyen de mortalité cumulée en fin de suivi est de 19,3 % pour des valeurs variant de 10 à 30 % selon les parcs. L' impact des pratiques culturales et des caractéristiques biologiques et environnementales des cheptels sur les taux de mortalité est également estimé au moyen de corrélations. Dans certains cas, la recherche d' Herpes-virus a pu être effectuée. L'élévation des températures déclenche le processus de mortalité... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassostrea gigas; Mortalités; Bassin de Marennes-Oléron; Système d'Information Géographique. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00108/21955/19549.pdf |
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| Delaporte, Maryse; Soudant, Philippe; Moal, Jeanne; Giudicelli, Emilie; Lambert, Christophe; Seguineau, Catherine; Samain, Jean-francois. |
| Arachidonic acid (20:4n-6, ArA) and its eicosanoid metabolites have been demonstrated to be implicated in immune functions of vertebrates, fish, and insects. Thus, the aim of this study was to assess the impact of ArA supplementation on the FA composition and hemocyte parameters of oysters Crassostrea gigas. Oyster dietary conditioning consisted of direct addition of ArA solutions at a dose of 0, 0.25, or 0.41 mu g ArA per mL of seawater into tanks in the presence or absence of T-Iso algae. Results showed significant incorporation of ArA into gill polar lipids when administered with algae (up to 19.7%) or without algae (up to 12.1%). ArA supplementation led to an increase in hemocyte numbers, phagocytosis, and production of reactive oxygen species by... |
| Tipo: Text |
Palavras-chave: Hemocyte parameters; Oyster immunity; Arachidonic Acid; Poly unsaturated fatty acids; Nutrition; Bivalve; Crassostrea gigas. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1876.pdf |
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| Mary, Charlotte; Pien, S; Blin, J.l.; Ropert, Michel. |
| The regional monitoring network REMONOR, relying on the experience of IFREMER's REMORA national network, each year assesses the mortality, growth and quality for two age classes ("adults" = 2 years and "juveniles" = 1 year) of cup oysters, distributed among various farm sites in the main oyster farming sectors of Lower Normandy. This network, led in collaboration by LERN (Environment Resources Laboratory) and SMEL (Coastline Installations Public-Private Entity), this year welcomes a new farm site in Veules les Roses, in Seine Maritime (76), bringing to 18 the total number of monitored sites. For operational reasons, a reduced monitoring protocol was conducted in 2005 on this last farm site, which will not take on the network's standardised protocol until... |
| Tipo: Text |
Palavras-chave: REMORA; Quality; Growth; Mortality; Normandy; REMONOR; Cupped (gigas) oyster; Crassostrea gigas; REMORA; Qualité; Croissance; Mortalité; Basse Normandie; REMONOR; Huître creuse; Crassostrea gigas. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-2212.pdf |
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| Suquet, Marc; Agogue, Julie; Brizard, Raphael; Haffray, Pierrick; Labbe, Catherine; Le Coz, Jean-rene; Pepin, Jean-francois; Rault, Paul; Saulnier, Denis. |
| Ce rapport fait état d'une étude réalisée au laboratoire de Génétique et Pathologie de l'IFREMER dans le cadre de l'analyse d'épisodes de mortalité anormale survenue en écloserie privée de crevettes pénéides. Plusieurs hypothèses ont été avancées. La présence de Vibrio harveyi a amené à constituer une collection de 40 souches à partir desquelles une identification bactériologique a été effectuée. Elle montre en effet une dominance de souches appartenant à un groupe homogène de Vibrio harveyi. La technique de ribotypage (digestion d'ADN génomique, transfert de Southem-blot et hybridation avec une sonde spécifique) est alors mise en place. Plusieurs difficultés techniques ont ralenti l'analyse et n'ont donc pas permis d'avoir des résultats assez avancés pour... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassostrea gigas; Tétraploïdes; Sperme; Conservation; Diagnostic zoo-sanitaire; Flore bactérienne; Herpès virus.. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00304/41554/40762.pdf |
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| Baud, Jean-pierre; Brisset, Emmanuelle; Cardinal, Mireille. |
| Une étude d'affinage contrôlé en bassin de l'huître creuse Crassas/rea gigas a été réalisée en novembre 1991 par "IFREMER de Bouin (Vendée). Cinq tonnes d'huîtres ont été nourries avec la diatomée Skeletonema costatum produite sur eau salée souterraine à raison de 1,2 X 10(9) cellules/individus/jour. L'affinage a été réalisé dans un bassin bétonné de 500 m2 muni d'une rampe de bullage d'air à une densité de 11 kg/m2 de coquillages. L'influence de différents paramètres sur l'affinage a été testée à l'aide d'un plan factoriel incluant : La taille des huîtres (86,8g ± 3,8 ; 69,5g ± 3,2 ; 53,1g.± 2,3), la technique de stockage (au sol, en casier surélevé, en poche surélevée) et la situation des huîtres par rapport à l'injection du phytoplancton (alimentation,... |
| Tipo: Text |
Palavras-chave: Affinage contrôlé; Crassostrea gigas; Skeletonema costatum; Glycogène. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00048/15882/13304.pdf |
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| Barille, Laurent. |
| Recent feeding-physiology experiments have shown that the Japanese oyster Crassostrea gigas was able to operate a selection among inorganic and organic particles before ingestion. However, the underlying mechanisms are not well understood. Anatomical observations of different structures which may play a raie in the selection processes are brought together and submitted to the actual knowledge on bivalve feeding. The mantle lobes, the ciliary structure of the ordinary filaments, the marginal ventral groove and the labial palps are described. |
| Tipo: Text |
Palavras-chave: Nutrition; Crassostrea gigas; Huîtres; Ecophysiologie. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/1994/publication-3077.pdf |
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| Caryo, Chrystelle. |
| L'estimation des stocks d'huîtres en élevage dans le bassin de Marennes-Oléron réalisée en 1988 est la cinquième opération annuelle consécutive de ce type. A cette occasion, une comparaison a été réalisée entre deux méthodes de traitement des données de surface ou de longueur d'installation à partir des couvertures photographiques aériennes au 1/10 000ème (surfaces en exploitation) et au 1/1 000ème (taux d'occupation des surfaces en exploitation). Les principaux résultats obtenus lors de cette étude montrent que par rapport à l'année précédente, on constate une relative stabilité des surfaces exploitées. Celles-ci sont en légère régression pour l'élevage à plat, et pratiquement inchangées pour l'élevage en surélévation. Par contre, les densités d'élevage... |
| Tipo: Text |
Palavras-chave: Ostréiculture; Huître japonaise; Crassostrea gigas; Bassin de Marennes-Oléron; Stocks; Surfaces exploitées; Densités; Biomasse; Méthodologie. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00105/21654/19235.pdf |
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| Kuntz, Grégoire. |
| Depuis le début des années 1990, se sont étendues sur le littoral français des mortalités estivales touchant les juvéniles de l'huître creuse, Crassostrea gigas. La rivière d'Auray est un secteur d'élevage conchylicole particulièrement affecté par ce phénomène. Une enquête menée sur trois années (1995 à 1997) tente de dresser le bilan de ces mortalités et d'identifier les facteurs responsables. Au cours de l'été 1997 différents suivis environnementaux (phytoplancton, physicochimie, .. . ), physiologiques (croissance, maturation, ... ) et pathologiques (histologie,PCR, ... ) ont été menés afin d'avoir une approche la plus large possible des différents facteurs potentiellement impliqués lors de ces mortalités. |
| Tipo: Text |
Palavras-chave: Mortalité; Maladie; Juvéniles; Crassostrea gigas; Rivière d'Auray; Bretagne. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00426/53728/54604.pdf |
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| Registros recuperados: 858 | |
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