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| Ranson, Gilbert. |
| Les conditions expérimentales réalisées par la technique ostréicole dans les régions de Marennes et d'Arcachon en particulier, permettent d'analyser comme il serait impossible de le faire uniquement au laboratoire, sur une petite échelle, les facteurs du développement de l'Huître. L'expérimentation au laboratoire a beaucoup d'enseignements à puiser dans la pratique chaque fois que la chose se présente, pour discerner surtout plus facilement les éléments anormaux qu'elle introduit, par suite de conditions spéciales différentes de celles de la nature. [OCR NON CONTRÔLE] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1936 |
URL: http://archimer.ifremer.fr/doc/1936/publication-5732.pdf |
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| Ranson, Gilbert. |
| Shell is the basis of the distinction between the different species of molluscs. But the elements defining the shape and colour of the shell can vary according to the environmental conditions. So much so that, in numerous cases, a whole range of intermediates can be found between two species. Among molluscs, oysters are considered as a particularly confused group. Their shells are indeed extremely variable. All sorts of intermediates can be found. They usually attach themselves using their bottom valve, and, depending on the shape of the substrate, salinity conditions, temperature, outside environment, they present a wide range of individual variations. I had the opportunity to examine the larval shells of some of our coastal species. I noticed that each... |
| Tipo: Text |
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| Ano: 1967 |
URL: http://archimer.ifremer.fr/doc/1967/publication-3761.pdf |
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| Ranson, Gilbert. |
| Depuis longtemps déjà, on a noté l'envahissement de nos côtes par le Gryphea angulata Lamarck (Portugaise) et simultanément la disparition progressive de l’Ostréa édulis L. (Huître française, Plate). La simultanéité des deux phénomènes a naturellement porté il croire que l'un était la cause de l'autre. |
| Tipo: Text |
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| Ano: 1926 |
URL: http://archimer.ifremer.fr/doc/00019/13023/10001.pdf |
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| Ranson, Gilbert. |
| In a recent note I reported the high exceptional mortality which hit, in 1926, the young Portuguese oysters aged one month. I demonstrated that this mortality was caused by the high temperatures of August. The maximum was reached on the 25th of August, with 33°, and corresponds with the day the young oysters were affected. This temperature corresponded to a very high tide coefficient. In 1927, there was, as in any other year, a first fixation of the larvae on the collectors over the second fortnight of July and a second one around the 10th of August. At the end of this month, even if the temperature was not as high as the previous year and stayed constant, we still observed an abnormal mortality in the young oysters recently fixed and especially in those... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1929 |
URL: http://archimer.ifremer.fr/doc/1929/publication-5810.pdf |
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