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| Dorange, G; Lepennec, M. |
| The spermatozoon of Pecten maximus is of the primitive type usually associated with species having external fertilization or emitting the sperm in the water. The size of the nucleus is reduced. The middle piece is similar to that reported for several Bivalves. It contains glycogen. But the spermatozoon of P. maximus exhibits its own ultrastructural characteristics: the short acrosome differs in size, shape, position and ultrastructure or by a combination of these from that of many bivalves. No axial rods was observed in contrast to several species of Mytilidae, Veneridae and Ostreidae. These originalities could go to the genus level. |
| Tipo: Text |
Palavras-chave: Pecten maximus; Bivalvia; Ultrastructure; Sperm. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1725.pdf |
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| Flassch, Jean-pierre; Barret, Jean; Mazurie, Joseph; Maes, P; Nicolas, J; Noel, Thierry; Paillard, C; Lepennec, M. |
| A national program started in 1989 to drive researches on Ruditapes philippinarum brown ring disease correlated with a vibrio called P1. The researches have concerned epidemiological surveys on spats and adults, treatment methods, diagnostic techniques, and anatomical and functional studies about the vibrio-clam relations. The transmissions of the disease appeared mainly related to contaminated manila clam seeds, with secondary horizontal propagation. The brown ring formation appeared to be caused by a periostracum deterioration. Taking into account some of these results, an adapted cultural technique including special care of seeds and decreased densities was proposed to the farmers. |
| Tipo: Text |
Palavras-chave: ANE; France; Brittany Ruditapes philippinarum Bivalvia Marine molluscs Vibriosis Research programmes Adults Spat Diseases Clam culture Rearing. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-925.pdf |
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