||The diatom Navicula ostrearia Bory in the Bay of Bourgneuf
||Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1973-09 , Vol. 37 , N. 3 , P. 363-368
||North east Atlantic, France, Oyster pond, Microscopic observation, Polymorphomism, Diatom
|Résumé en anglais
||Previously, Navicula ostrearia B. has been described only from the Marennes-Oleron district of the Atlantic coast of France. However, this pennate diatom is also present In the Bay of Bourgneuf where breeding of green-gilled oysters were recognized in sea basins called oyster ponds. A short description of observations made with the optical microscope precedes description of high magnification examination of the frustule made with the scanning electron microscope. This combination of techniques shows a polymorphism between the external and internal surfaces of diatom valves.