|
|
|
| Registros recuperados: 858 | |
|
|
| Thielley, Maryse. |
| A l'heure actuelle, l'objectif des éc10series d'huîtres est d'atteindre une autonomie d'approvisionnement en larves quelle que soit la saison et donc d'étaler les émissions de gamètes sur toute l'année. A la suite de problèmes rencontrés pour atteindre cet objectif, il s'est avéré nécessaire d'entreprendre des études sur les méthodes à mettre en oeuvre pour contrôler la qualité de la reproduction en écloserie et notamment l'état de maturité des géniteurs. Notre étude porte sur ce dernier point. Une étude bibliographique présente les différentes méthodes plus ou moins précises, actuellement utilisées pour contrôler l'état de maturité des gonades de bivalves. La majorité d'entre elles nécessite le sacrifice d'animaux. Une approche expérimentale portant... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Bivalves; Reproduction; Maturité sexuelle; Biopsie. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00419/53094/54051.pdf |
| |
|
| |
|
|
| Fleury, Pierre-gildas; Ruelle, Francois; Claude, Serge; Palvadeau, Hubert; Robert, Stephane; D'Amico, Florence; Vercelli, Catherine; Chabirand, Jean-michel. |
| 1. Introduction: network organisation in 1997. The REMORA network - REseau MOIIusques du département Ressources Aquacoles de l'Ifremer - (Ifremer's Aquaculture Resources Department Mollusc Network) has been evaluating, since 1993, hollow oysters' growth (Crassostrea gigas) in major French oyster beds. In order to do so, it has followed up on a yearly basis the growth of a unique oyster batch shared among different stations in the main French raising areas. Releasing takes place in February and picking happens in November or December; intermediary sampling is done in June and September. All operations happen on the same dates for all stations. A national report is published each year. 'Regional' stations are sometimes added to the national network, but they... |
| Tipo: Text |
Palavras-chave: France; Growth; Network of monitoring; Crassostrea gigas; Oyster culture. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/rapport-1765.pdf |
| |
|
|
| His, Edouard. |
| This study analyses the larval recruitment and biology in Crassostrea Gigas, in the Arcachon Bay. Three types of observations were conducted: - a study of the reproduction anomalies in C. gigas between 1976 and 1981. - observations of the particulate nutrition of the veligeres. - ecotoxicologic experiments (organostannic action on oyster reproduction, mostly). The reproduction anomalies in C. gigas could not be attributed to either the genitors' quality or the water quality in the Arcachon Bay, but to a perturbation of the veligeres' trophic regime; the hypothesis of an alteration of the nanoplancton in the Bay, during the summer period, and linked to the action of the organotins is highly considered. The assumption of responsibility of the particulate... |
| Tipo: Text |
Palavras-chave: Organostanniques; Ecotoxicologie; Nutrition; Anomalies de la reproduction; Bassin d'Arcachon; Crassostrea gigas; Véligères; Recrutement. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/these-3347.pdf |
| |
|
|
| Brunetiere, Claire. |
| Bien que l'impact des pathologies virales en aquaculture soit important, la prévention et les traitements antiviraux sont peu maîtrisés. De plus, les connaissances sur l'immunité des invertébrés marins face aux infections virales sont peu nombreuses. L'immunité non spécifique, constituant la première barrière de défense chez les vertébrés, représente le seul mécanisme de l'immunité décrit à ce jour chez les bivalves marins. De plus, les travaux ayant pour objet l'étude des mécanismes développés par les bivalves pour se défendre vis-à-vis de ces agents infectieux sont peu développés. Il apparaît donc important de comprendre quel(s) mécanismes(s) de défense peut(vent) être mis en place chez les huîtres adultes, C. gigas, pour limiter et /ou contrôler les... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassostrea gigas; Immunologie; Biologie cellulaire; Hémocytes. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00034/14475/11773.pdf |
| |
|
|
| Berthome, Jean-paul; Prou, Jean; Bodoy, Alain. |
| Growth of the japanese oyster, Crassostrea gigas was monitored during 4 years, by following the recruitment of the year 1978, held in rearing conditions. After three and half years, the average length was la cm and the average total weight was 80 g. Clear seasonal changes were observed on the growth in length and weight. An important loss in dry weight occured in July, during the release of gametes. Such losses constituted 29 %, 43 % and 60 % of the dry weight, respectively for individuals which were 2 years, 3 years and 4 years old. The higher instantaneous growth rates (G) were observed during spring and at the beginning of summer. Growth model of Von Bertalanffy, gave the best estimate for the length growth of the species. During the 1979-1982... |
| Tipo: Text |
Palavras-chave: Growth parameter; Growth model; Reardd stock; Crassostrea gigas; Oyster; Growth; Descripteurs de croissance; Modèle de croissance; Stock cultivé; Crassostrea gigas; Huître; Croissance. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/publication-2967.pdf |
| |
|
|
| Paulet, Yves-marie; Lorrain, Anne; Richard, Joëlle; Pouvreau, Stephane. |
| To test the potential of diet switching experiments in ecophysiological studies of marine invertebrates, stable carbon isotope ratios were measured at different seasons in the gonad, adductor muscle, digestive gland and gills of scallops (Pecten maximus) and oysters (Crassostrea gigas) held for 15 days on a constant diet of phytoplankton depleted in 13C. The aim of this study was to determine if differences in carbon incorporation could be detected among species, seasons and organs, and if so, whether it was consistent with their known energy-allocation patterns. After offering the new diet, isotope values of the different organs gradually shifted and significant differences among organs, seasons and species were found. A carbon incorporation index (CII)... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Pecten maximus; Carbon isotopes; Metabolism; Energy allocation. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1202.pdf |
| |
|
|
| Saulnier, Denis; De Decker, Sophie; Haffner, Philippe. |
| Because Vibrio aestuarianus is known to cause serious infections in Pacific oyster Crassostrea gigas, a real-time PCR assay was developed targeting the dnaJ gene of this bacterium. Only V. aestuarianus strains isolated from C. gigas mortality events in different geographic areas and the reference strain tested positive, whereas no amplification products was obtained with type strains belonging to 23 other species of Vibrio. Sensitivity and reproducibility of the method were assessed using either seawater or oyster homogenate samples spiked with one V aestuarianus strain. All these samples were stored at -20 degrees C in order to mimic retrospective or grouped natural sample analysis without quantification bias due to prolonged freezing. Analysis of... |
| Tipo: Text |
Palavras-chave: V. aestuarianus; Vibrio; Taqman; Real time PCR; Pathogen; Oyster; Crassostrea gigas. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6447.pdf |
| |
|
|
| Renault, Tristan. |
| Le Laboratoire de Génétique, Aquaculture et Pathologie (GAP) de la Station IFREMER de La Tremblade, se propose dans le présent projet d'étudier le virus de type herpès observée chez les huîtres (pouvoir pathogène, conditions d'expression de l'infection, transmission, etc ... ) et de développer des réactifs permettant de réaliser un diagnostic rapide, sensible et fiable de l'infection qu'il occasionne. Les outils de diagnostic développés sont basés sur la détection directe du virus, soit au moyen de réactifs immunologiques spécifiques des antigènes viraux, soit par des techniques de biologie moléculaire permettant de détecter l'ADN viral (hybridation de sondes nucléiques et réaction PCR). Ce projet, proposé sur une durée de trois années (1995-1998),... |
| Tipo: Text |
Palavras-chave: Virus; Pathologie; Herpès virus; Crassostrea gigas; Pathogène; Herpesviridae. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00043/15450/12825.pdf |
| |
|
|
| Degremont, Lionel; Boudry, Pierre; Soletchnik, Patrick; Bedier, Edouard; Ropert, Michel; Samain, Jean-francois. |
| Three successive generations were produced between 2001 and 2003 to assess to what extent genetic variability exists for this trait in juvenile oysters Crassostrea gigas. For each generation, two groups were selected for their high ("R" for resistant) and low ("S" for susceptible) survival. Significant differences of mortality were observed during the first year in Rivière d'Auray (RA) (Brittany-France). However, low and similar mortality were observed for both groups, with no significant difference between groups in the first and second generation in this site, where the first summer is the critical sensitive period with a clear age effect. In Baie des Veys (BDV) (Normandie-France), where mortalities usually mainly affect adults, mortality between... |
| Tipo: Text |
Palavras-chave: Genetic variability; Genetic; Summer mortality; Crassostrea gigas; Pacific oysters. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3442.pdf |
| |
|
|
| Soletchnik, Patrick; Ropert, Michel; Mazurie, Joseph; Fleury, Pierre-gildas; Le Coz, Florence. |
| Oyster mortality was monitored at multiple sites along the French coastline (around 5 500 km) between 1993 and 2005. Mortality data for one- and two-year-old oysters were collected over 1012 years in 39 oyster culture sites bordering 3 different "seas": the English Channel, Bay of Biscaye and Mediterranean. Combining these data with records from environmental monitoring databases, 11 of these sites had consistent chronological data sets including both environmental data and mortality records. Mortality in one-year-old oysters was clearly summer mortality (49% of their annual mortality) whereas mortality of two-year-olds occurred mostly in spring (51%). Analysis of variance revealed that "coastal area" was the main influence on mortality of one-year-olds... |
| Tipo: Text |
Palavras-chave: Mortality; Environment; Crassostrea gigas; Pacific oyster. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3295.pdf |
| |
|
|
| Gras, Marie-paule; Gras, Paul. |
| At the beginning of its introduction, following the massive mortality rate of 1970-1971 that struck the Portuguese oyster, Crassostrea angulata (COMPS and GRAS 1973), the oyster from the Pacific, Crassostrea gigas, displayed excellent growth in addition to exceptional hardiness and resistance to mortality. But, since 1973, in most of the farming areas, there has been a slowdown in the growth of the oysters and an at times quite pronounced decrease in their quality. It was in order to better understand their adaptation to the environment and the causes of the lowering of their growth rate and their condition that a study was undertaken in 1974, in one of the largest areas of flat cultivation of the Marennes-Oléron basin, located on the east coast of the... |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Biochimie; Biométrie; Huîtres; Crassostrea gigas. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/acte-2988.pdf |
| |
|
|
| Faury, Nicole; Ratiskol, Jacqueline. |
| Les conditions météorologiques semblaient cette année à priori favorables à la reproduction des moules. Cependant, le maturation des gonades a été très lente. Ainsi, les premières pontes, de faible importance, ont eu lieu début Avril. Plusieurs émissions tardives sont apparues fin Mai et se sont poursuivies jusqu'au début du mois de Juillet. Elles n'ont pas été importantes et ont conduit à une faible quantité de larves au stade fixation. Un captage "moyen" a été observé début Mai. Ensuite, la présence de quelques larves grosses n'a pas permis un recrutement suffisant. Généralement, suite à la période de reproduction les moules reconstituent rapidement leur réserve; or cette année, elles sont restées maigres jusqu'à la fin Juillet. Le fort déficit... |
| Tipo: Text |
Palavras-chave: Reproduction; Captage; Naissain; Crassostrea gigas; Marennes Oléron; Mytilus edulis. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00072/18285/15857.pdf |
| |
|
| |
|
|
| Heral, Maurice; Deslous-paoli, Jean-marc. |
| The analysis of the official statistics of commercialised production of oysters (.Crassostrea angutata and Crassostrea gigas ) is achieved from 1866 to 1984 in term of their numbers and weights for the bay of Marennes-Oleron. The number of sanitary labels, multiplied by the mean weight of a crate can also give out the commercialised production provided it is increased by the bias and decreased by the exterior production of the bay . Thus the production of Portuguese oysters is only 45 000 tons from 1948 to 1957 with a maximum of 52, 000 tons for respectively 70 000 tons and 280 000 tons for the statistics . AIso, after the epizooties of Crassostrea angulata the production, fell down to 25 000 tons in 1971 according to the number of sanitary labels... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Production conchylicole; Analyse statistique. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/0985/acte-2958.pdf |
| |
|
|
| Huvet, Arnaud; Fleury, Elodie; Corporeau, Charlotte; Quillien, Virgile; Daniel, Jean-yves; Riviere, Guillaume; Boudry, Pierre; Fabioux, Caroline. |
| We investigated the role of oyster gonadal TGF beta (og-TGF beta) in the reproduction of Crassostrea gigas, using an in vivo RNA interference approach. We designed double-stranded RNA targeting og-TGF beta, which is specifically expressed in the somatic cells surrounding germ cells in the gonad of both male and female oysters. In vivo injection of this og-TGF beta dsRNA into the gonad led to knock-down phenotypes for both sexes, with significant reduction (77.52% relative to controls) of the gonad area, lowered reproductive effort and germ cell under-proliferation. Interestingly, half of the injected females halted their vitellogenesis, since we were only able to observe pre-vitellogenic oocytes. In addition, apoptotic germ cells and haemocytes infiltrated... |
| Tipo: Text |
Palavras-chave: Marine bivalve; Crassostrea gigas; Reproduction; RNA interference; Transforming growth factor-beta. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19794/17486.pdf |
| |
|
|
| Huvet, Arnaud; Jeffroy, Fanny; Daniel, Jean-yves; Quere, Claudie; Le Souchu, Pierrick; Van Wormhoudt, A.; Boudry, Pierre; Moal, Jeanne; Samain, Jean-francois. |
| In the oyster Crassostrea gigas consumption-related traits, amylase properties and growth were found to be linked through genotypes that differed for polymorphism in the two amylase genes AMYA and AMYB. Modulation of AMYA mRNA level had already been observed in response to food availability, whereas the functional role of AMYB was still unknown. To improve knowledge about the regulation of amylase expression in C. gigas and the respective roles of the two genes, we made an assay of amylase expression at mRNA and enzymatic levels in the digestive gland of oysters that had received dietary supplements of starch. After 18 days, a significant increase of translatable mRNA for AMYB was observed, with a correlated increase in Michaelis-Menten constant Km values... |
| Tipo: Text |
Palavras-chave: Alpha-amylase; Crassostrea gigas; Digestive enzyme; Michaelis-Menten constant; Regulation. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19869/17521.pdf |
| |
|
|
| Royer, J; Seguineau, Catherine; Park, K; Pouvreau, Stephane; Choi, K; Costil, K. |
| Two methods were used to estimate the reproductive output of female Pacific oysters reared in Normandy: histology with image analysis and ELISA (Enzyme-Linked lmmunoSorbent Assay) which allowed the quantification of egg protein. Condition indices, gonad area and gametogenetic stages of the oysters were determined in the entire population (males and females) between May and October 2005. All investigations were performed in 3 age classes: oysters in their first, second or third years (corresponding to spat, half-grown and market-sized oysters, respectively). Both quantitative histology and ELISA provided similar results in terms of reproductive effort (illustrated by the gonado-somatic index, GSI) except during the GSI drop, corresponding to spawning, which... |
| Tipo: Text |
Palavras-chave: Reproductive effort; Image analysis; Gametogenetic cycle; ELISA; Crassostrea gigas; Condition index. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4305.pdf |
| |
|
|
| Mazurie, Joseph; Langlade, Aime; Fleury, Pierre-gildas; Bouget, Jean-francois; Claude, Serge; Foucart, Marie; Bedier, Edouard. |
| This study is the second part of a former report rapport Ifremer DRV/RST/RA/LCB/2002-08 dealing with rearing methods, growth and mortality performances, and problems encountered by the oyster farmers from Quiberon Bay (2800 ha of leases) : the first report relied on a survey achieved in july 200l, about 18 oyster farmers, and 2 diving campaigns (july and october 2001) on 2 years old oyster batches from the same farmers. Il is now completed by a last campaign of diving in october 2002, on 7 parcels out of the 18, still bearing the initial oysters. The analysed enterprises vary in particular by the location and depth of their concession inside the bay, but also by their rearing scheme : a majority favours seedings with 18 month old oysters or more, according... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassastrea gigas; Baie de Quiberon; Croissance; Mortalité; Pratiques culturales; Rentabilité économique; Cupped oyster; Crassostrea gigas; Mortality; Rearing practices; Profitability; Bay of Quiberon; .growlh. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00102/21322/18944.pdf |
| |
|
|
| Boulais, Myrina; Soudant, Philippe; Le Goic, Nelly; Quere, Claudie; Boudry, Pierre; Suquet, Marc. |
| In the Pacific oyster, spermatozoa are characterized by a remarkably long movement phase (i.e., over 24 h) sustained by a capacity to maintain intracellular ATP level. To gain information on oxidative phosphorylation (OXPHOS) functionality during the motility phase of Pacific oyster spermatozoa, we studied 1) changes in spermatozoal mitochondrial activity, that is, mitochondrial membrane potential (MMP), and intracellular ATP content in relation to motion parameters and 2) the involvement of OXPHOS for spermatozoal movement using carbonyl cyanide m-chlorophenyl hydrazone (CCCP). The percentage of motile spermatozoa decreased over a 24 h movement period. MMP increased steadily during the first 9 h of the movement phase and was subsequently maintained at a... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Intracellular ATP content; Mitochondrial membrane potential; Oxidative phosphorylation; Sperm motility. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00303/41376/40666.pdf |
| |
| Registros recuperados: 858 | |
|
|
|
