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| Registros recuperados: 225 | |
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| Grizel, Henri. |
| Le problème majeur allant à l'encontre du développement de l'aquaculture dans le monde, en particulier pour l'élevage des mollusques, est lié à des maladies infectieuses. Les agents responsables sont essentiellement des parasites et des microorganismes intracellulaires. Les données acquises en pathologie des mollusques sont à l'heure actuelle en majorité descriptives, mais compte tenu de l'impact économique de ces maladies, des recherches doivent être développées pour élaborer des mesures prophylactiques et thérapeutiques. Dans cette optique l'établissement de lignées cellulaires de mollusques marins constitue une priorité car, à l'instar des lignées cellulaires de vertébrés utilisées en pathologie humaine et vétérinaire, elles permettraient la production... |
| Tipo: Text |
Palavras-chave: Pathologie; Culture cellulaire; Biologie moléculaire; Agent pathogène; Primoculture; Ostrea edulis. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00049/15978/13420.pdf |
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| Da Silva, Sara Maria Mira. |
| Les études de génétique des populations des bivalves marins ont fréquemment mit en évidence une relation hétérozygotie / valeur sélective, et un fort déficit en hétérozygotes. Parmi les hypothèses explicatives de ces deux phénomènes, la création d'individus consanguins dans les populations est particulièrement intéressante à tester. Le but de ce travail était de vérifier s'il pouvait y avoir un nombre faible de géniteurs à la base d'un événement de reproduction donné chez l'huître plate Ostrea edulis. Dans cette étude, nous montrons qu'une cohorte de captage collectée sur un intervalle de temps très court (15 jours), présente une diversité génétique fortement réduite ainsi qu'une modification des fréquences alléliques par rapport aux populations d'adultes... |
| Tipo: Text |
Palavras-chave: Génétique population; Huître plate; Ostrea edulis; Diversité génétique; Variabilité génétique. |
| Ano: 2001 |
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| Marteil, Louis. |
| Bien que la culture de l'huître portugaise ne soit pas autorisée dans le Bassin Morbihannais, jusqu'ici réservé à la production et à l'élevage de la seule huître plate, Ostrea edulis, il n'est pas rare de trouver chaque année, parmi les jeunes plates qui garnissent les collecteurs, quelques exemplaires de Gruyphea angulata. Celles- sont toujours peu nombreuses : 1 pour 50000 ou même 10 000 huîtres plates. Si les individus adultes de l'une et l'autre espèces peuvent être facilement distingués par leur seule conformation extérieure, cette différentiation n'est pas toujours aussi aisée sur les très jeunes naissains fixés, en raison de l'existence de jeunes plates présentant, au premier examen, des ressemblances marquées avec de jeunes portugaises. |
| Tipo: Text |
Palavras-chave: Huître plate; Ostrea edulis; Gryphea angulata; Naissain; Comparaison. |
| Ano: 1953 |
URL: http://archimer.ifremer.fr/doc/00003/11466/8026.pdf |
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| Lallias, Delphine; Arzul, Isabelle; Heurtebise, Serge; Ferrand, Sylvie; Chollet, Bruno; Robert, Maeva; Beaumont, Andrew; Boudry, Pierre; Morga, Benjamin; Lapegue, Sylvie. |
| Bonamiosis is a parasitic disease (causative agent: Bonamia ostreae) affecting the European flat oyster Ostrea edulis, responsible for a drastic decline in the aquaculture production of this oyster species. Therefore a selective breeding program for resistance to bonamiosis has been undertaken since 1985 bu Ifremer, leading to the production of several selected oyster families. In the present study, a 6-month cohabitation challenge experiment was performed in order to transmit the disease from wild oysters (injected with the parasite) to two tested families of oysters originating from the selective breeding program. Mortalities were checked daily, and ventricular heart smears were performed on dying or moribund oysters to detect the level of infection to... |
| Tipo: Text |
Palavras-chave: Heart smear; Transmission; Cohabitation experiment; Bonamia ostreae; Ostrea edulis. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/acte-4535.pdf |
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| Lallias, Delphine; Beaumont, A.r.; Haley, C.s.; Boudry, Pierre; Heurtebise, Serge; Lapegue, Sylvie. |
| This study presents the first genetic linkage map for the European flat oyster Ostrea edulis. AFLP and 20 microsatellite markers were genotyped in a three-generation pedigree comprised of 2 grand-parents, 2 parents and 92 progeny. Chi-square goodness of fit tests revealed high segregation distortion, which was significant for 32.8% of markers. Sixteen microsatellites and 235 AFLPs (170 AFLPs type 1:1 and 65 AFLPs type 3:1) were used to build sex-specific linkage maps using CriMap software. The first parental map (P1) consisted of 104 markers grouped in nine linkage groups, spanning 471.2 cM with an average spacing of 4.86 cM. The second parental map (P2) consisted of 117 markers grouped in ten linkage groups (which equals the haploid chromosome number),... |
| Tipo: Text |
Palavras-chave: Microsatellite; AFLP; Ostrea edulis; Flat oyster; Genetic linkage map. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2642.pdf |
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| Suquet, Marc; Pouvreau, Stephane; Queau, Isabelle; Boulais, Myrina; Le Grand, Jacqueline; Ratiskol, Dominique; Cosson, Jacky. |
| n brooding mollusc species that incubate larvae before their release in seawater, the biology of gametes remains poorly explored. The present study describes some biological characteristics of sperm of the European flat oyster, a native species that has been over-exploited in the past and is nowadays classified as an endangered species in Europe. Flat oysters were collected by divers in the Rade de Brest (Finistère, France), during its natural reproduction period. Gonadal pH is acidic (6.31 ± 0.10). Spermatozoa are clustered in spermatozeugmata, an acellular structure in which the sperm heads are embedded. After their transfer in seawater, spermatozeugmata have a mean diameter of 64 ± 3 μm and they release free spermatozoa for a mean duration of... |
| Tipo: Text |
Palavras-chave: Oyster; Ostrea edulis; Brooding species; Sperm; Spermatozeugmata; Endangered species. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56539/58245.pdf |
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| Gervais, Ophelie. |
| The flat oyster, Ostrea edulis, is the European endemic oyster species. Its production has been reduced because of overfishing and diseases including bonamiosis. Massive mortalities observed on the Pacific cupped oyster these last years explained the wish of shellfish farmers to diversify their production and their revival of interest for this patrimonial oyster species. However, bonamiosis due to the protozoan, Bonamia ostreae, is still a major problem for the production of this species. Measures to control the disease are limited and require a better knowledge of the interactions between the flat oyster and the parasite. Previous studies have suggested the involvement of apoptosis in flat oyster defense mechanisms against B. ostreae. This mechanism is... |
| Tipo: Text |
Palavras-chave: Huître plate; Ostrea edulis; Bonamia ostreae; Apoptose; Flat oyster; Ostrea edulis; Bonamia ostreae; Apoptosis. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00370/48142/48243.pdf |
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| Diaz Almela, Elena. |
| La structuration géographique des populations naturelles d'huître plate (Ostrea edulis) a été étudiée à partir de l'analyse du polymorphisme de conformation simple brin (SSCP), d'un fragment d'environ 300 pb du gène de l'ARNr mitochondrial 12S. les échantillons (13 localités, 507 individus) utilisés avaient fait l'objet d'une étude antérieure de structuration des populations avec 5 locus microsatellites. Il ont été analysés ici dans le but d'une comparaison des structurations observées sur marqueurs mitochondrial et nucléaire. La diversité moyenne intrapopulation du gène de l'ARNr 12S (Hn.b = 0,494) est presque la moitié de celle estimée avec les microsatellites (Hn.b = 0,904) bien que la variance entre populations soit beaucoup plus forte pour l'ADN... |
| Tipo: Text |
Palavras-chave: Génétique population; Huître plate; Ostrea edulis; Microsatellite; ARNr mitochondrial 12S; Diversité génétique. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00033/14381/11671.pdf |
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| Bedier, Edouard; Langlade, Aime; Angeri, Stéphane; Brizard, Raphael; Nerlovic, V.; Glize, Philippe; Haffray, Philippe. |
| Since the outbreaks of the parasitosis with Marteilia refringens and Bonamia ostreae in the last 60's, the French production of the European flat oyster dropped from 20000 mT to less than 1500 mT currently, leaving the French shellfish farming in situation of virtually monoculture of the Pacific cupped oyster Crassostrea gigas. To sustain this traditional culture, Ifremer has developed, at the experimental level, a genetic selection for a better tolerance to Bonamia ostreae which led to an improvement of survivals. The transfer of these results to the business scale requires the control of the reproduction in hatchery and the adaptation of the cycle of production to the constraints of seedlings in deep water as practised in Brittany (France). That's why a... |
| Tipo: Text |
Palavras-chave: Selection; Genetic; Bonamia ostreae; Parasite; Ostrea edulis; Oyster. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3313.pdf |
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| Buestel, Dominique; Ropert, Michel; Prou, Jean; Goulletquer, Philippe. |
| The history of French oyster culture consists of a succession of developmental phases using different species, followed by collapses caused by diseases. The indigenous species Ostrea edulis was replaced first with Crassostrea angulata, then C. gigas. France is now the top producer and consumer of oysters in Europe, producing around 120,000 t of the cupped oyster C. gigas annually, and an additional 1500 t of the flat oyster O. edulis. Cupped oysters are produced all along the French coast from natural and hatchery spat. Various structures are used to collect spat from the wild. After a growing-on period, oysters are Cultivated by three main methods: (1) on-bottom culture in the intertidal zone or in deep water, (2) off-bottom culture in plastic mesh bags... |
| Tipo: Text |
Palavras-chave: Cupped oyster; Flat oyster; Ostrea edulis; Crassostrea gigas; French production; Aquaculture. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7396.pdf |
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| Registros recuperados: 225 | |
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