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| Bachrach, E.. |
| For more than a century, botanists have been focusing on a microscopic alga, a blue protoplasmic diatom causing the oysters to turn green. In 1669, the Englishman Sprat observed for the first time the relation between the turning green of the sea bottom and that of the oysters. In 1820, Gaillon studied the green matter covering the bottom, including the rocks and the shells, of the oyster ponds with a microscope, and noticed that it was made up of some long mobile organisms, with pointed ends and loaded with green pigment. He named them Vibrio ostrearia. He provided some very good explanations leading to the conclusion that these Vibrio were the cause of the oysters' colour change. A few years later, Bory de Saint-Vincent, classifies them in the genus... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1935 |
URL: http://archimer.ifremer.fr/doc/1935/publication-5718.pdf |
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| Bachrach, E.; Simonet, M.. |
| A biological fact, which seemed to have a limited impact, has turned into a wider phenomenon since our experimental studies. In a critical review written by one of us (1), we had already demonstrated that the turning blue of Navicula ostrearia could not be considered as a property specific to this individual. In a dissertation (2), Hinard names other oyster bottom diatoms, less numerous than Navicula ostrearia, but showing a blue pigment as well (Storoneis crucigerum, Amphiprora paludosa). A few years ago, one of us, in collaboration with A. Jouvent (3) showed that, in specific environmental condition, some marine diatoms, belonging to other genera than Navicula (Nitzschia, Grammatophora) show this blue pigmentation phenomenon. Moreover, our unpublished... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1936 |
URL: http://archimer.ifremer.fr/doc/1936/publication-5737.pdf |
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| Bachrach, E.; Jullien, A.; Lucciardi, N.; Richard, J.-g.. |
| The ponds are a cultivation environment not only for the oyster but also for the rich microscopic flora and fauna which go together with the lamellibranch. The Diatoms are the focus of the oyster farmers as they not only contribute to the molluscs' nutrition but are also susceptible to change the colour of their gills in specific environmental conditions. We carried out in parallel an experimental study on the oyster and on the marine diatoms, and aimed to precise the optimal conditions for these two organisms, in order to know if they are the same for both of them. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1936 |
URL: http://archimer.ifremer.fr/doc/1936/publication-5754.pdf |
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