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| Registros recuperados: 77 | |
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| Le Borgne-david, A. |
| The Portuguese oyster (Crassostrea angulata) and the sea-squirt Ciona intestinalis are both filter-feeders and compete for space in the oyster beds. Valve movement in oysters and shortening and elongation in Ciona were recorded on a smoked drum. Oysters showed a slow (3 one half min) spontaneous opening/closing rhythm, which was speeded up by stimulatory (vitamin) substances and increased in amplitude by toxic accumulated waste substances, or sudden change in temperature. Ciona showed a regular contraction rhythm of similar to 1 min and single sharp shortening after a strong light stimulus or a food particle touch stimulus to the oral tentacles. The neural ganglion discharges spikes 3 times faster than in the dark, after light stimulation. Filtration rates... |
| Tipo: Text |
Palavras-chave: Stimulation; Rhythm; Temperature; Crassostrea angulata; Portuguese oyster. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-2052.pdf |
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| Soletchnik, Patrick; Huvet, Arnaud; Le Moine, Olivier; Razet, Daniel; Geairon, Philippe; Goulletquer, Philippe; Faury, Nicole. |
| This study presents the zootechnical performances in their natural habitat, the Marennes Oléron Bay, of two Crassostrea gigas and Crassostrea angulata taxons of European and Asian origin, as well as those of their "European" hybrids (6 studied strains). Growth performance seems to be a phenotypic characterisation linked with the maternal origin (c. gigas or C. angulata). The Asian "pure gigas" or "pure angulata" strains' growth performances differ more from those of their European "sisters" than the European taxons with their hybrids. The C. angulata strain, of Taiwanese origin, does not survive the second culture week in the Marennes Oléron Bay. The C. angulata strain seems to "carry" a strong mortality potential. After 6 months of off-bottom culture, the... |
| Tipo: Text |
Palavras-chave: Survie; Performance croissance; Hybrides; Zootechnie; Crassostrea angulata; Crassostrea gigas; Huîtres. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/acte-3382.pdf |
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| Huvet, Arnaud. |
| Les définitions taxonomiques de Crassostrea angulata et Crassostrea gigas font l'objet de controverses. Les similitudes morphologiques et physiologiques ainsi que l'homogénéité des fréquences allozymiques entre populations des deux taxons orientent les auteurs vers un regroupement au sein d'une seule espèce. Récemment, une étude basée sur l'analyse par RFLP de l'ADN mitochondrial a révélé des différences permettant de distinguer C. angulata et C. gigas. La caractérisation par 4 marqueurs microsatellites de 12 populations des 2 taxons révèlent les points suivants : des déficits en hétérozygotes sont observés dans l'ensemble des populations, l'analyse de la variabilité inter-populations montre l'existence d'une structuration, l'analyse des distances... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Crassostrea angulata; Microsatellites; Différenciation. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00033/14377/11667.pdf |
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| Huvet, Arnaud. |
| Dans ce présent travail, nous proposons d' étudier la variabilité génétique de populations d' huîtres creuses C. Gigas au niveau mondial à l'aide de ces nouveaux marqueurs moléculaires. La reconnaissance de populations génétiquement distinctes étant désormais possible, les performances de certaines de ces populations dans les conditions locales d' élevage sont comparées. L'objectif sera ici d'identifier des populations plus performantes que celle actuellement en élevage. Pendant toute la durée du programme, la profession ostréicole représentée par la Section Régionale de la Conchyliculture de Marennes-Oléron sera tenue informée de l'évolution des résultats. |
| Tipo: Text |
Palavras-chave: Génétique; Marqueur génétique; Croisement génétique; Huîtres creuses; Crassostrea gigas; Crassostrea angulata. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00044/15562/12950.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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| Soletchnik, Patrick; Huvet, Arnaud; Le Moine, Olivier; Razet, Daniel; Geairon, Philippe; Faury, Nicole; Robert, Stephane; Goulletquer, Philippe. |
| This study presents the zootechnical performances in their natural habitat, the Marennes Oléron Bay, of two Crassostrea gigas and Crassostrea angulata taxons of European and Asian origin, as well as those of their "European" hybrids (6 studied strains). Growth performance seems to be a phenotypic characterisation linked with the maternal origin (c. gigas or C. angulata). The Asian "pure gigas" or "pure angulata" strains' growth performances differ more from those of their European "sisters" than the European taxons with their hybrids. The C. angulata strain, of Taiwanese origin, does not survive the second culture week in the Marennes Oléron Bay. The C. angulata strain seems to "carry" a strong mortality potential. |
| Tipo: Text |
Palavras-chave: Performance croissnce; Hybrides; Zootechnie; Crassostrea angulata; Crassostrea gigas; Huîtres. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/acte-3283.pdf |
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| Cornette, Florence. |
| L'étude historique de l'ostréiculture française monte que cette activité est caractérisée par des périodes de prospérités et de pénurie. Des épizooties ont été à l'origine de ces alternances. A chacune de ces période, on a pu constater des changements d'espèces : Ostrea edulis fut remplacée par Crassostrea angulata, de même celle-ci fut remplacée par Crassostrea gigas dans les années 1970. L'étude de la bibliographie montre que les techniques utilisées pour distinguer des espèces Crassostrea angulata et Crassostrea gigas sont insuffisantes. L'évolution des technologies en matière d'analyses génétiques ouvrent de nouvelles perspectives. La recherche de marqueurs moléculaires réalisée sur Crassostrea angulata et Crassostrea gigas, par amplification par PCR... |
| Tipo: Text |
Palavras-chave: Crassostrea angulata; Crassostrea gigas; Marqueurs moléculaires; ADN mitochondrial; PCR; Enzymes de restrictions; Haplotypes. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00049/15979/13421.pdf |
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| Riesco, Marta F.; Felix, Francisca; Matias, Domitilia; Joaquim, Sandra; Suquet, Marc; Cabrita, Elsa. |
| Sperm cryopreservation is a widely employed technique that promotes alternative techniques to contribute to broodstock management or restoration programs for species of commercial interest, endangered species or species with an interesting genotype. The preservation of genetic material from improved stocks or from the original population is extremely important for the oyster aquaculture industry to prevent the potential impacts of epidemic diseases and natural disasters. The Portuguese oyster, Crassostrea angulata, was the most important species commercialized by the shellfish industry. However, inadequate management of this industry and pathology occurrences resulted in a significant decrease in natural populations. For this reason, in this work a... |
| Tipo: Text |
Palavras-chave: Crassostrea angulata; Sperm; Cryopreservation; Motility; Viability; Fertilization. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00333/44432/44098.pdf |
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| Comps, Michel; Gras, Paul. |
| A year after the end of the Gill disease which heavily struck the Portuguese oysters Cassostrea angulata Lmk. (Marteil, 1968), a new disease whose causes are still unexplained caused a massive mortality in the same species in the summer of 1970 (Comps, 1972). It can be considered, in 1973, that the successive losses lead to the quasi-extinction of the species C. angulata in the farms of the Marennes basin, since, contrary to what has been done in the case of the Malpèque disease in Canada, the indigenous specious was replaced by another species, the Pacific oyster Crassostrea gigas Thunberg. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Huîtres; Mortalité; Crassostrea angulata. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/acte-5927.PDF |
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| Huvet, Arnaud; Lapegue, Sylvie; Magoulas, A; Boudry, Pierre. |
| The respective status of the Portuguese oyster, Crassostrea angulata, and the Pacific oyster, Crassostrea gigas, has long been a matter of controversy. Morphological and physiological similarities, homogeneity of allozyme allelic frequencies between populations of the two taxa and the demonstration of hybridization lead most authors to suggest that they should be regrouped within the same species. The risk of introgression and the present expansion of C. gigas aquaculture in Europe raises the question of the need for preservation of C. angulata in Europe, as only a few populations remain. We studied European and Asian populations of C. gigas and C. angulata using microsatellite and mitochondrial DNA markers to estimate their genetic diversity and... |
| Tipo: Text |
Palavras-chave: Phylogeography; Population genetics; Microsatellites; Crassostrea gigas; Crassostrea angulata. |
| Ano: 2000 |
URL: https://archimer.ifremer.fr/doc/2000/publication-707.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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| Soletchnik, Patrick. |
| The Marennes-Oléron Bay on the Atlantic coast is a major oyster culture centre in France. 40 000 tonnes of cupped oysters are produced there each year. The two taxa C. angulata and C. gigas have been cultured in turn over the last century. Since 1950, larvae have been captured between June and September in the southern part of the Bay, near the mouth of the Seudre River, the traditional oyster spat capture zone. This historical database shows that the frequency of larvae capture is defined by three to four peaks in larvae emission in C. angulata and only two peaks for C. gigas during a single season. Seventeen years of data on C. angulata between 1950 and 1969 and 27 years for C. gigas between 1972 and 2000 demonstrate that the beginning of the spawning... |
| Tipo: Text |
Palavras-chave: Crassostrea angulata; Crassostrea gigas; Marennes Oléron bassin; Pertuis Charentais; Environnement; Huître creuse; Reproduction. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2008/rapport-4126.pdf |
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| Registros recuperados: 77 | |
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