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Registros recuperados: 57
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Marteiliosis in American oysters Crassostrea virginica reared in France ArchiMer
Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno.
Progeny of Crassostrea virginica oysters, introduced into France in 1992, were reared at 3 different locations. A survey was taken of these young C, virginica oysters during 1993. Histological and electron microscopical examination revealed a parasite interpreted as a Marteilia-like protozoan in 1 oyster. The structure and the initial stages of the developmental cycle of this parasite are described for the first time in American oysters. However, no mature spores were detected. Thus, exact identification of the protozoan is difficult. This study indicates that American oysters could be infected with Marteilia spp, during cohabitation with Marteilia-infected native bivalves in France.
Tipo: Text Palavras-chave: American oyster; Crassostrea virginica; Marteiliosis; Marteilia-like parasite.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00258/36926/36177.pdf
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Essai d'acclimatation de Crassostrea virginica et performances biologiques comparées avec Crassostrea gigas (1ère partie) ArchiMer
Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Nourry, Max; Renault, Tristan; Cochennec, Nathalie.
Premier volet du programme d'essai d'acclimatation de l'huître américaine Crassostrea virginica, ce rapport présente les actions et les résultats de l'année 1992 qui a été consacrée à : • l'importation selon les normes du CIEM d'un lot de 50 huîtres en provenance d'Angleterre, • leur élevage en salle de quarantaine et leur conditionnement en vue d'une accélération de la maturation sexuelle, • l'obtention d'une première génération, ainsi que son suivi en élevage larvaire et en micronurserie à l'URGE-La Tremblade, • au contrôle des performances comparées des deux populations de C. virginica et de C. gigas en nurserie de prégrossissement à l'URRA-Bouin pendant toute la période automnale et hivernale. Au terme de cette première année d'étude il apparait que la...
Tipo: Text Palavras-chave: Mollusques; Acclimatation; Crassostrea virginica; Crassostrea gigas; Génétique; Pathologie.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00077/18843/16417.pdf
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Herpes-like virus infecting Japanese oyster (Crassostrea gigas) spat ArchiMer
Renault, Tristan; Cochennec, Nathalie; Le Deuff, Rose-marie; Chollet, Bruno.
During the summer of 1993, abnormal sporadic mass mortalities (80-90%) and morbidities occurred among four batches of young Japanese oyster (Crassostrea gigas) spat from the French Atlantic coast. These mortalities were only observed in July. Samples of affected animaIs were examined by electron microscopy. This paper reports the presence and appearance of herpes viruses in these samples.
Tipo: Text Palavras-chave: Herpes like virus; Mortalities; Crassostrea gigas; Oysters.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-2888.pdf
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Compte rendu de la réunion des 14 et 15 Avril 1993 - La Tremblade - Réseau Génétique Mollusques (REGEMO) ArchiMer
Gerard, Andre; Naciri, Yamama; Coatanea, Denis; Martin, Anne-genevieve; Barret, Jean; Claude, Serge; Heurtebise, Serge; Devauchelle, Nicole; Joly, Jean-pierre; Goulletquer, Philippe; Baud, Jean-pierre; Nourry, Max; Bougrier, Serge; Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno; Le Deuff, Rose-marie; Peignon, Jean-marie.
La discussion générale organisée à la fin de la deuxième journée a fait ressortir les points suivants: 1- Les participants se sont déclarés satisfaits de la tenue de la réunion, tant dans son déroulement, que dans les échanges d'informations auxquels elle a donné lieu. La quantité et la qualité des résultats présentés a permis de mettre en évidence la puissance d'analyse que représente le travail en réseau. 2-L'importance de la valorisation des résultats a été soulignée à plusieurs reprises. La diffusion de l'information devrait se faire dans un premier temps par la voie de rapport internes à la DRV, puis par la voie d'articles publiés dans des revues scientifiques. Sur le programme "C. gigas triploïdes", une première diffusion des résultats obtenus en...
Tipo: Text Palavras-chave: Génétique; Sélection génétique; Huître plate; Ostrea edulis; Génétique population; Croissance.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00049/15981/13423.pdf
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Outils de dépistage des pathogènes - Contrat Région Poitou-Charentes 1999 - Convention 99/RPC-A-200 "Pathologie" ArchiMer
Renault, Tristan; Cochennec, Nathalie.
Le Laboratoire de Génétique et Pathologie (LGP) de la station IFREMER de La Tremblade (Charente Maritime) est impliqué aux plans national et international dans l'étude des maladies affectant les mollusques bivalves marins d' intérêt économique et plus particulièrement les huîtres. Des travaux concernant le développement, la validation et l'utilisation d'outils de diagnostic spécifiques d'agents infectieux propres aux coquillages y sont ainsi menés.
Tipo: Text Palavras-chave: Pathologie; Maladie; Mollusques bivalves; Diagnostic; Huître creuse; Crassostrea gigas.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00043/15471/12850.pdf
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Compte-rendu des résultats d'analyses effectuées en histologie - Année 1995 ArchiMer
Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno.
Dans le cadre du Réseau zoosanitaires CEE (huître plate) et suivi d'autres espèces, 890 individus provenant des zones 5, 6 et 7 ont été examinés sur l'ensemble de l'année 1995 par différentes techniques : 472 analyses sous coupes histologiques, 328 analyses sur appositions d'organes, 90 analyses sur milieu au thioglycolate.
Tipo: Text Palavras-chave: Pathologie; Analyse; Histologie; Technique; Bivalves; Ostrea edulis; Huître plate; Mytilus edulis; Ruditapes philippinarum; Ruditapes decussatus; Cerastoderma edule; Mortalité.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15504/12877.pdf
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Etude comparative en cytométrie en flux des fonctions estérases et du métabolisme oxydatif d'hémocytes d'huîtres saines, parasitées, sensibles et résistantes au protozoaire Bonamia ostrea ArchiMer
Cochennec, Nathalie; Garcia, Sandrine; Bedier, Edouard.
In order to fight Bonamiosis, the applicable means are very limited and mostly based on a quick and precocious diagnostic aimed at avoiding the propagation of the disease and a rise in the "resistance" through genetic selection. Various works are conducted in order to understand the oysters' defence mechanisms against this parasite, and then to develop new prophylaxis and fighting methods. In our laboratory, we focus on cellular compartments, the circulating haemocytes, in which B. ostreae multiplies, and their interaction with the parasite.
Tipo: Text Palavras-chave: Protozoaire; Huître; Hémocytes; Cytométrie en flux; Bonamia ostreae; Biologie cellulaire.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3275.pdf
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Epidémiologie de Bonamia ostreae et Marteilia refringens en Bretagne en 1984 et 1985 : situation et évolution ArchiMer
Tige, Gilbert; De Kergariou, Gabriel; Cochennec, Nathalie; Rabouin, Marie-agnès.
A systematic surveillance progam conducted since 1980 along the coasts of Britanny has followed the evolution and epidemiological state of the natural O. eulis oyster beds and seed areas in the intertidal zones and deep water. Presently, Marteilia refringens exists endemically in Brittany estuaries ; the rate and degree of infestation varies from year to year depending on the hydrological conditions and the geographical region. In no case, however, is the return of flat oyster culture envisoned. Bonamia ostreae is present not only in the estuaries but also in the deep-water rearing areas (Baie de Quiberon, Cancale, Baie de St Brieuc). The infestation increases with age, but also depends on the quantity of the stock and the culture practises. In particular,...
Tipo: Text Palavras-chave: Huître plate; Ostrea edulis; Maladie; Bonamia ostreae; Marteilia refringens; Bretagne; Oyster; Ostrea edulis; Diseases; Bonamia ostreae; Marteilia refringens.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00022/13299/10353.pdf
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Experimental transmission of a Herpes-like virus to axenic larvae of Pacific oyster, Crassostrea gigas ArchiMer
Le Deuff, Rose-marie; Nicolas, Jean-louis; Renault, Tristan; Cochennec, Nathalie.
A herpes-like virus which was associated with mortalities amongst hatchery-reared larvae of Pacific oysters, Crassostrea gigas. was observed for the first time in France during the summer 1991 (Nicolas et al.. 1992). Since this first report, we have noted further outbreaks of the disease in the summers of 1992 and 1993 in hatcheries on the western coasts of France in which a similar virus was associated with moribund larvae. Moreover, in the summer 1991, Hine et al. (1992) described a herpes-like virus responsible for larval mortality of hatchery reared C. gigas, in New Zealand. Ail these viruses are c10sely related with respect to their size and morphology and to their apparent cellular tropism for fibroblastic cells.
Tipo: Text Palavras-chave: Transmission; Herpes like virus; Crassostrea gigas; Oysters.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-2887.pdf
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Contrat de Plan Etat Région Poitou-Charentes 1994-1998. Convention 97 RPC R 58 - Programme Pathologie - Rapport Scientifique année 1997 ArchiMer
Renault, Tristan; Berthe, Franck; Thebault, Anne; Lipart, Cecile; Chollet, Bruno; Haffner, Philippe; Cochennec, Nathalie.
Le but de ce programme pathologie est de rechercher et d'étudier les agents pathogènes connus et inconnus chez les mollusques bivalves marins, plus particulièrement chez l'huître creuse, Crassostrea gigas, afin d'identifier d'éventuels agents causant des mortalités, de proposer des mesures prophylactiques et de définir des conditions zootechniques permettant aux professionnels de limiter l'impact des maladies sur leur cheptel. La présence de maladies, chez les mollusques bivalves marins dont l'impact socio économique peut être catastrophique pour les productions conchylicoles, et l'accroissement des échanges de produits d'aquaculture entre les pays de la CEE et avec les pays tiers nécessitent le renforcement des recherches dans les domaines de la...
Tipo: Text Palavras-chave: Pathologie; Pathogènes; Virus; Herpès virus; Crassostrea gigas; Diagnostic; Herpesviridae.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00043/15454/12829.pdf
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Compte rendu de la réunion REGEMO sur l'amélioration génétique de l'huître plate du 11 mars 1998 à Nantes : Bilan actualisé du programme de sélection ArchiMer
Goyard, Emmanuel; Lapegue, Sylvie; Cochennec, Nathalie; Baud, Jean-pierre; Langlade, Aime; Joly, Jean-pierre; Buestel, Dominique; Oheix, Jocelyne; Haure, Joel.
Le programme de sélection de l'huître plate a été initié en 1985 par des pathologistes de la Tremblade. La sélection ne portait que sur le seul critère de tolérance des huîtres plates au parasite Bonamia ostreae et correspondait plus à un outil pour étudier divers aspects de la parasitose qu'un un programme d'amélioration génétique visant la relance de la culture de l'huître plate. Dans le cadre du réseau REGEMO, ce programme a ensuite été repris par les généticiens de l'Ifremer : 1) rappel historique et définition d'un vocabulaire commun à l'ensemble des membres du réseau REGEMO. 2) Inventaire et bilan des opération menées ou en cours ( sur la dernière génération de sélection produite ne 1995, sur le matériel issu de cette génération et produit en 1997....
Tipo: Text Palavras-chave: Génétique; Sélection génétique; Huître plate; Ostrea edulis; Génétique population; Croissance.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00049/15977/13419.pdf
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Acclimatation de nouvelles espèces d'huîtres creuses du genre Crassostrea: hybridations et conservatoire de souches. Contrat de Plan Etat Région Poitou- Charentes 1994-1998 - Convention 95/RPC-R-57 "Génétique" - Rapport année 1995 ArchiMer
Boudry, Pierre; Naciri, Yamama; Heurtebise, Serge; Delsert, Claude; Ledu, Christophe; Phelipot, Pascal; Chollet, Bruno; Cochennec, Nathalie; Gerard, Andre.
Le laboratoire IFREMER "Génétique Aquaculture et Pathologie" (GAP) (La Tremblade et Bouin) a entrepris des actions de recherche sur ces différents points. L'Unité de Recherche en Génétique, en collaboration avec tous les membres du Réseau Génétique Mollusques (REGEMO), a axé une partie de ses travaux sur l'acclimatation et l'hybridation de différentes espèces du genre Crassostrea. Ces recherches ont débuté avec le soutien du Conseil Général de Charente-Maritime depuis 1992 sur des essais d'acclimatation de C. virginica, l'huître creuse américaine. En prolongement de cette étude, l'URGE a proposé à la région Poitou-Charentes un programme de recherche plus vaste sur l'ensemble des espèces d'huîtres creuses.
Tipo: Text Palavras-chave: Génétique; Acclimatation; Hybridation; Crassostrea virgnica.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15515/12902.pdf
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Marteilia in American oysters Crassostrea virginica reared in France ArchiMer
Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno.
Progeny of Crassostrea virginica oysters, introduced into France in 1992, were reared at 3 different locations. A survey was taken of these young C. virginica oysters during 1993. Histological and electron microscopical examination revealed a parasite interpreted as a Martelia-like protozoan in 1 oyster. The structure and the initial stages of the developmental cycle of this parasite are described for the first time in American oysters. However, no mature spores were detected. Thus, exact identification of the protozoan is difficult. This study indicates that American oysters could be infected with Marteilia spp. during cohabitation with Marteilia-infected native bivalves in France.
Tipo: Text Palavras-chave: Marteilia like parasite; Marteiliosis; Crassostrea virginica; American oyster.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/publication-2897.pdf
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Comparison of Heamograms from resistant and susceptible European flat oysters, Ostrea edulis, exposed to the parasite, Bonamia ostreae ArchiMer
Cochennec, Nathalie; Renault, Tristan; Chollet, Bruno; Maffart, Patricia.
To study the cellular defence mechanisms involved in the resistance of the flat oysters against Bonamia ostreae, a comparaison of haemograms was performed between susceptible and resistant animals
Tipo: Text Palavras-chave: Pathogen; Bonamia ostreae; Ostrea edulis.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/acte-2906.pdf
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Bilans depuis 1999 et évolution de la stratégie du REPAMO ArchiMer
Thebault, Anne; Martin, Anne-genevieve; Pichot, Yves; Chollet, Bruno; Robert, Maeva; Le Coguic, Yvette; Tige, Gilbert; Hirata, Toshio; Mazurie, Joseph; Le Saux, Jean-claude; Masson, Nadine; Auby, Isabelle; Maurer, Daniele; Le Roux, Frédérique; Cochennec, Nathalie; Renault, Tristan; Berthe, Franck; Grizel, Henri.
The main objectives of the Mollusc Pathology Network (REPAMO) are to prevent introductions or outbreaks of infectious agents, prevent spread within a farm and especially from one farm to another, to study ways of decreasing the impact of infectious agent and to monitor the development of these pathogens in order to guarantee the health status of oysters exchanged with our commercial partners. On the whole, REPAMO's activities have not changed and include: - monitoring the development of diseases that have to be reported to authorities and carrying out analyses to classify zones: bonamiosis and marteiliosis; - baseline monitoring of farmed and wild populations of bivalve molluscs; - studying cases of abnormal mortality events; - controlling mollusc...
Tipo: Text Palavras-chave: Mollusques; Réseau surveillance; Pathologie; REPAMO.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3265.pdf
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Haplosporidiosis in the pacific oyster Crassostrea gigas from the French Atlantic coast ArchiMer
Renault, Tristan; Stokes, Nancy; Chollet, Bruno; Cochennec, Nathalie; Berthe, Franck; Gerard, Andre; Burreson, Eugene.
Two cases of haplosporidian infection occurred during 1993 in Pacific oysters Crassostrea gigas from the French Atlantic coast. The localization and ultrastructure of the plasmodia are described. In situ hybridization of infected tissue sections was conducted with DNA probes for oyster-infecting haplosporidians. The Haplosporidium nelsoni-specific DNA probe MSX1347 hybridized with the C. gigas parasite, and the H, costale-specific probe SSO1318 did not hybridize. Total genomic DNA was extracted from the infected tissue sections for polymerase chain reaction (PCR) amplification of the haplosporidian. PCR amplifications with H. nelsoni-specific primers and with 'universal' actin primers did not yield the expected products of 573 and 700 bp, respectively. A...
Tipo: Text Palavras-chave: Haplosporidium nelsoni; Haplosporidiosis; Crassostrea gigas; Pacific oyster.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-821.pdf
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L'amélioration des performances de l'huître plate européenne Ostrea edulis par la sélection génétique ArchiMer
Bedier, Edouard; Baud, Jean-pierre; Cochennec, Nathalie; Cornette, Florence; Gerard, Andre; Goyard, Emmanuel; Joly, Jean-pierre; Kopp, Joel; Langlade, Aime; Le Coguic, Yvette; Mazurie, Joseph; Nourry, Max.
The European flat oyster Ostrea edulis has been considered as the traditional French oyster for a very long time and has now nearly disappeared from our farms, as a consequence of the two successive epizootic of the Marteilia refringens parasite and Bonamia ostreae. The actual quasi monoculture of Crassostrea gigas has made necessary the search for a diversification in oyster culture, including the search for a new start of the indigenous flat oyster culture. The Ifremer has been conducting parallel works since 1985 in order to better understand the biology of the parasite as well as to try and select different lines of flat oyster resistant to Bonamia ostreae.
Tipo: Text Palavras-chave: Bonamia ostrea; Huître plate; Sélection Génétique; Ostrea edulis.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3274.pdf
Registros recuperados: 57
Primeira ... 123 ... Última
 

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