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| Gras, Marie-paule. |
| The mortality that decimated Portuguese oysters, C. angulata, in 1970-1971, up to 80% in most sectors, required the introduction of C. gigas oysters resistant to disease and whose reproduction proved itself to be excellent (GRAS and assoc. 1971). Artificial beds of Pacific oysters were created. Nonetheless, in some areas, there continued to be small populations of C. angulata that, mixed in with the C. gigas oysters that had been brought in, participated in reproduction. Genetic problems then arose, among which the selection of specimens and hybridisation were to be considered more specifically. There are, in fact, two cases of hybridisation. |
| Tipo: Text |
Palavras-chave: Génétique; Hybridation; Huîtres; Crassostrea angulata; Crassostrea gigas. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/acte-2987.pdf |
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| Gras, Marie-paule; Gras, Paul. |
| Following the high mortality which killed the Portuguese oysters Crassostrea angulata cultivated on the French coasts, the massive establishment of Pacific oysters Crassostrea gigas, resisting the disease and the creation of artificial deposits for the latter was decided. In most culture areas, the mortality was estimated at more than 80 % of the stock, but, in some regions, some small populations of Crassostrea angulata subsisted and kept on reproducing. A genetic control of the spawner stocks had to be made. The first step was to know if the oysters living in the same areas were of the same species in order to foresee the next generations and try to improve them (selection). |
| Tipo: Text |
Palavras-chave: Sélection; Determination; Crassostrea gigas; Crassostea angulata; Huîtres; Génétique. |
| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/1977/acte-6579.pdf |
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| 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 |
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