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| Registros recuperados: 77 | |
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| Alderman, D. J.; Gras, Paul. |
| During April and May of this year, there has been a heavy mortality of Portuguese oysters, Crassostrea angulata LmK., which were imported into Britain from the River Tagus (Portugal) in March. Losses in some cases exceeded 90 per cent. The symptoms shown by the dyring oysters are the same as those seen in Britain and France in C. angulata in 1967 and 1968. Farley described the general symptoms in oysters (C. virginica Gmelin) dying of prolonged functional or infectious disease. These gross symtoms appear to be similar in the case of several different diseases including the present European mortality. |
| Tipo: Text |
Palavras-chave: Gill; Crassostrea angulata; Oysters. |
| Ano: 1969 |
URL: http://archimer.ifremer.fr/doc/1969/publication-5931.PDF |
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| Balabaud, Karen. |
| Avec 30 000 tonnes d'huîtres produites chaque année, l'ostréiculture est l'activité principale du bassin de Marennes-Oléron. Caractérisé par une très forte interaction avec les milieux professionnels de la conchyliculture, l'Ifremer se doit avant tout de répondre à leurs questions, en particulier en matière de croissance, de reproduction et surtout en matière de mortalité de l'huître creuse. En effet, l'huître portugaise Crassostrea angulata fut décimée de 1968 à 1972 par un agent pathogène de type iridovirus. Pour faire face à cette disparition des populations d'huîtres japonaises Crassostrea gigas sont alors introduites en France. Mais, les professionnels s'interrogent sur la bonne adaptation de l'huître creuse japonaise à l'environnement français et... |
| Tipo: Text |
Palavras-chave: Génétique; Croisement; Isolement reproductif; Huîtres creuses; Hybrides; Marqueurs moléculaires; PCR; Crassostrea gigas; Crassostrea angulata. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00033/14441/11740.pdf |
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| Batista, Frederico; Ben-hamadou, Radhouan; Fonseca, Vera; Taris, Nicolas; Ruano, Francisco; Reis-henriques, Maria; Boudry, Pierre. |
| The taxonomic status of the cupped oysters Crassostrea angulata and C. gigas has received considerable attention in the last decades. Based on larval shell morphology, experimental hybridization, allozymes and nuclear DNA studies several authors have considered these two taxa as being synonymous. However, mitochondrial data showed clear genetic differences between the two taxa. In addition, microsatellite-based studies and cytogenetic studies have also provided evidence that supports their differentiation. Considerable differences have also been observed at the phenotypic level in terms of growth rate and ecophysiological parameters. In the present study, C. angulata from Sado estuary (Portugal) and C. gigas from Seudre estuary (France) were collected and... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Crassostrea angulata; Hybridization; Shell pigmentation; Shell morphology. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3904.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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| Batista, Frederico; Fonseca, Vera; Ben-hamadou, Radhouan; Taris, Nicolas; Henriques, Maria; Boudry, Pierre. |
| Unlike in some crops, no large heterotic effects have been observed in most farmed animals. Interestingly, significant hybrid vigour for some traits has been reported in the Pacific oyster, Crassostrea gigas. Crossbreeding between closely related taxa can be seen as an efficient way to exploit the dominance component of the genetic variance of a trait. Factorial crosses between the Portuguese oyster C. angulata (from Sado estuary, Portugal) and C. gigas (from Seudre estuary, France) were done to evaluate the aquaculture potential of hybrids. Juveniles of the different progenies were reared in Ria Formosa (Portugal) under usual farming conditions. The genetic confirmation of all progenies was done using mitochondrial and nuclear markers in order to detect... |
| Tipo: Text |
Palavras-chave: Hybridization; Crassostrea angulata; Crassostrea gigas; Genetic; Oyster. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-3429.pdf |
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| Batista, Frederico; Leitao, Alexandra; Huvet, Arnaud; Lapegue, Sylvie; Heurtebise, Serge; Boudry, Pierre. |
| The taxonomic status of the Portuguese oyster Crassostrea angulata and the Pacific oyster Crassostrea gigas has often been a matter of controversy. Based on larval shell morphology, experimental hybridisation and electrophoretic studies of enzyme polymorphism several authors have considered these two species as being synonymous. During the recent years, several genetic studies based on mitochondrial DNA and microsatellites data have provided evidences that the two taxa are genetically distinct although closely related. Furthermore, karyotype analyses have also highlighted the close genetic similarity of these taxa in comparison with other cupped oyster species. However, a comparative analysis of restriction enzymes ideograms revealed differences between... |
| Tipo: Text |
Palavras-chave: Geographical origin; Phylogenetic; Genetic; Taxonomic status; Crassostrea angulata; Oyster. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3433.pdf |
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| Boudry, Pierre; Huvet, Arnaud. |
| The taxonomic status of Crassostrea angulata and Crassostrea gigas has long been a matter of controversy. Morphological and physiological similarities, as well as homogeneity in allelic frequencies on allozymes between the populations of the two taxa, lead most authors to suggest to regroup of the two within the same species. European and Asian populations of C. gigas and C. angulata have been studied using microsatellite and mitochondrial DNA markers. The analysis of genetic distances and the distribution of allelic and haplotype frequencies revealed a differentiation between the populations of C. gigas and C. angulata. The data allowed the construction of Neighbor-joining trees for each of the two types of markers. Similar topologies appeared with data... |
| Tipo: Text |
Palavras-chave: Mitochondrial DNA; Nuclear DNA; Phylogeography; Crassostrea angulata; Crassostrea gigas; Genetic; Oyster. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/acte-3434.pdf |
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| Boudry, Pierre; Huvet, Arnaud; Fabioux, Caroline; Lapegue, Sylvie. |
| Crassostrea angulata and Crassostrea gigas, two cupped oyster taxa of Asian origin (O'Foighil et al, 1998), were successively introduced into Europe during the XVIth and the XXth century respectively (Héral and Grizel, 1991). To date, populations presumed to be C. angulata remain only in the south of Spain and Portugal, while the geographic range of C. gigas is expending, notably due to aquaculture. The two taxa can be distinguished by RFLP analysis of the mitochondrial Cytochrome Oxydase I locus (COI). This marker revealed strong genetic differentiation between Asian populations of the two taxa (Boudry et al., 1998). In contrast, nuclear markers showed a much lower genetic differentiation (Huvet et al, in press). The absence of any reproductive barrier... |
| Tipo: Text |
Palavras-chave: Microsatellite; Genetic; Crassostrea angulata; Crassostrea gigas; Oysters. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/acte-3453.pdf |
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| Boudry, Pierre; Huvet, Arnaud; Fabioux, Caroline; Lapegue, Sylvie; Heurtebise, Serge; Ledu, Christophe; Blouin, Frederic; Phelipot, Pascal; Gerard, Andre. |
| L'étude de la variabilité génétique de l' huître creuse Crassastrea gigas est un point essentiel dans la mise en place de programmes de gestion des ressources génétiques et de sélection chez cette espèce. C. gigas, originaire du Japon, a été introduite dans de nombreuses régions du monde et représente aujourd'hui plus de 95 % de la production mondiale d' huîtres. Introduite en France au début des années 1970 pour remplacer l' huître portugaise Crassostrea angulata, c'est aujourd 'hui une ressource de première importance pour notre région. Malgré la maîtrise du cycle de reproduction de l'espèce et son importance commerciale, elle n' a pas été génétiquement améliorée et on peut donc considérer les stocks comme « sauvages» ou « non domestiqués ». De plus, la... |
| Tipo: Text |
Palavras-chave: Génétique; Ressources génétiques; Différenciation génétique; Hybridation; Anomalies chromosomiques; Huîtres creuses; Crassostrea gigas; Crassostrea angulata. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00044/15564/12955.pdf |
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| Comps, Michel. |
| Virus infections have been associated with major diseases of oysters of the genus Crassostrea. These infections include gill necrosis virus and hemocytic infection virus diseases of the Portuguese oyster C. angulata and more recently the oyster velar virus disease affecting larval, hatchery-reared Pacific oysters C. gigas. This report presents histo- and cytopathological characteristics of these infections in which large icosahedral cytoplasmic deoxyriboviruses, similar to the iridoviridae, are implicated, The gill necrosis virus causes, principally in the Portuguese oyster, an evolutive ulceration of the gills, including cellular hypertrophy and severe inflammation. Mortalities have been observed in the most serious cases. Hemocytic infection virus has... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Crassostrea angulata; Oysters; Viral diseases. |
| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/1988/publication-5912.PDF |
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| Comps, Michel; Bonami, Jean-robert; Vago, C.; Razet, Daniel. |
| Among the major epizootics known in marine Molluscs, the one that started on the coasts of Europe in 1970 in the Portuguese oyster, Crassostrea angulata, was certainly one of the largest due to its range and due to the economic loss sustained by the French oyster farming as a whole. It led to the disappearance of the species C. angulata as a farmed oyster, and to the massive introduction of the Japanese oyster, C. gigas, known to be resistant to the disease. From the first manifestations of this epizootic, the laboratories of the ISTPM were actively dedicated to its etiology. Now, after several years, a study begun at the La Tremblade laboratory has just been completed. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Mortalités; Histologie; Epizootie; Crassostrea angulata. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/publication-2995.pdf |
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| Registros recuperados: 77 | |
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