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Induction de la triploïdie chez l'huître creuse Crassostrea gigas par rétention du premier ou du second globule polaire ArchiMer
Roux, Isabelle.
La gonadogenèse chez les mollusques bivalves mobilise le métabolisme énergétique de l'animal, engendre un ralentissement de la croissance et une mortalité accrue des animaux fragilisés. La triploïdisation, qui consiste en une augmentation artificielle du matériel chromosomique d'un individu, aboutit à une stérilité partielle, voire totale, et constituerait ainsi une solution aux problèmes posés par la maturation sexuelle. , Chez l'huître creuse Crassostrea g!gas, l'obtention de lots triploïdes 3N-Méiose 1 et 3N-Méiose II "bien différenciés est considérablement gênée par le manque de synchronisme existant chez une population d'embryons pour l'expulsion des deux GP. Cette absence de synchronisme empêche de bien cerner le moment idéal d'application du...
Tipo: Text Palavras-chave: Triploïdisation; Globules plaires 1 et 2; 6-DMAP; Epifluorescence; Analyse d'image.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00411/52222/52949.pdf
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Observation on the feeding behaviour of Crassostrea gigas larvae in the bay of Arcachon (France) ArchiMer
Robert, René; His, Edouard.
Crassostrea gigas Iarvae were collected in the bay of Arcachon in July 1985, 1986 and 1987. Larval samples were collected daily at high tide, during at least the first 12 days of pelagie lire and every hour during 1 day and night cycle, 6 days after spawming. Epifluoreseence microscopy was used for detecting ingestion and digestion of nanoplankton and thin sections were made to try to determine the algal species ingested. The first algal uptake occurred 48 hours after fertilization and different stages or digestion were noted from the 3rd day. No relationship between ingestion or digestion and the age of the viligers was observed. There was no difference in the feeding activity du ring day and night. Because the nutrition index was high (70%) the feeding...
Tipo: Text Palavras-chave: Crassostrea gigas; Larves; Milieu naturel; Nutrition; Epifluorescence; Crassostrea gigas; Larvae; Natural surroundings; Nutrition; Epifluorenscence.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00015/12602/9480.pdf
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