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Registros recuperados: 61
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A long term study of bonamiosis in Quiberon bay, France ArchiMer
Arzul, Isabelle; Miossec, Laurence; Blanchet, Estelle; Garcia, Celine; Joly, Jean-pierre; Francois, Cyrille; Berthe, Franck.
Bonamiosis was first reported in association with mass mortality of flat oysters, Ostrea edulis, in June 1979 in L'Ile Tudy, Brittany. The disease rapidly spread to all of the oyster farming areas in France but also in other European countries. The French flat oyster production, which already suffered from another protozoan disease, marteiliosis, decreased from 5500 mt in 1979 to less than 2000 mt after 1980. In 2001, about 350 French farms sell 1650 mt of flat oysters. This production mainly relies on natural spat collection which specially occurs in Quiberon bay. One third of this spat is transferred from South to North Brittany for further growth. Quiberon bay constitutes an interesting site regarding the surveillance of bonamiosis because of the...
Tipo: Text Palavras-chave: Detection; Bonamia ostreae; Protozoan; Diseases; Pathology; Ostrea edulis; Oysters.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3314.pdf
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Arbitrarily primed PCR to type Vibrio spp. Pathogenic for shrimp ArchiMer
Goarant, Cyrille; Merien, Fabrice; Berthe, Franck; Mermoud, Isabelle; Perolat, Philippe.
A molecular typing study on Vibrio strains implicated in shrimp disease outbreaks in New Caledonia and Japan was conducted by using AP-PCR (arbitrarily primed PCR). It allowed rapid identification of isolates at the genospecies level and studies of infraspecific population structures of epidemiological interest. Clusters identified within the species Vibrio penaeicida were related to their area of origin, allowing discrimination between Japanese and New Caledonian isolates, as well as between those from two different bays in New Caledonia separated by only 50 km. Other subclusters of New Caledonian V. penaeicida isolates could be identified, but it was not possible to link those differences to accurate epidemiological features. This contribution of AP-PCR...
Tipo: Text Palavras-chave: Vibrio spp.; Shrimp; Molecular typing.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-2734.pdf
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Bilan 1999 du Réseau REPAMO - Réseau National de Surveillance zoosanitaire des Mollusques marins ArchiMer
Thebault, Anne; Martin, Anne-genevieve; Le Coguic, Yvette; Hirata, Toshio; Tige, Gilbert; Pichot, Yves; Grizel, Henri; Berthe, Franck; Cochennec, Nathalie; Renault, Tristan; Le Roux, Frederique.
Le réseau REPAMO (Réseau de Pathologie des Mollusques) est un réseau de santé animale, qui s'occupe des coquillages marins du littoral français métropolitain. Les mollusques marins des côtes françaises représentent une ressource par la pêche, mais sont surtout une part importante de l'aquaculture. Les pertes liées aux maladies dans ce domaine d'activité sont aujourd'hui considérées comme l'un des principaux facteurs limitants de son développement au niveau mondial. Deux exemples récents suffisent à illustrer ce danger pour l'ostréiculture française : • La culture de l''huître plate Ostrea edulis, déjà atteinte par un parasite, Marteilia refringens, est passée en quelques années de 20 000 tonnes à 1800 tonnes, suite à une épizootie. En effet à la fin des...
Tipo: Text Palavras-chave: Réseau surveillance; Pathologie; Mollusques bivalves; Mortalité.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00098/20903/18522.pdf
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Bilan du réseau pathologie des mollusques - REPAMO 1996 ArchiMer
Berthe, Franck.
La réglementation zoosanitaire vise à protéger les cheptels en limitant les risques de développement et de propagation des maladies infectieuses. La traduction en droit français des Directives Européennes 91167/CE et 95/70/CE confère au Réseau de Pathologie des Mollusques de l'IFREMER (REPAMO) la charge de contrôler la santé des invertébrés marins d' intérêt commercial sur le territoire national. Les objectifs de ce réseau sont les suivants : - la réalisation des analyses permettant de classer les zones pour les maladies obligatoirement déclarables, - la surveillance de base pour l'ensemble du cheptel français, - l'étude des causes de mortalité anormale, - le contrôle des produits échangés entre les pays de l'Union Européenne et la France et les pays...
Tipo: Text Palavras-chave: Mollusques bivalves; Pathologie; Réseau surveillance; Zoosanitaie.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00199/31046/29463.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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Bonamia exitiosa Hine et al., 2001 is proposed instead of B. exitiosus as the valid name of Bonamia sp infecting flat oysters Ostrea chilensis in New Zealand ArchiMer
Berthe, Franck; Hine, Mike.
A parasite of the dredge oyster Ostrea chilensis Philippi, previously known as Bonamia sp., was recently described and named Bonamia exitiosus, based on ultrastructural and molecular evidence. The rules governing the names of organisms require correspondence of gender, and the name must be changed from B. exitiosus to B. exitiosa.
Tipo: Text Palavras-chave: Zoological nomenclature; Bonamia exitiosa.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/2003/publication-2843.pdf
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Bonamia exitiosus n. sp (Haplosporidia) infecting flat oysters Ostrea chilensis in New Zealand ArchiMer
Hine, P; Cochennec, Nathalie; Berthe, Franck.
Bonamia sp. is a pathogenic parasite that occurs in the haemocytes of dredge oysters Ostrea chilensis Philippi in New Zealand, Ultrastructurally it resembles other haplosporidians in the possession of haplosporosomes, haplosporogenesis, persistence of mitotic microtubules during interphase and of the nuclear envelope during mitosis, and occurrence of a diplokaryotic or multi-nucleate plasmodial stage. Another stage containing a large vacuole derived from enlargement of 1 or more mitochondria has not previously been described from other haplosporidians. It most closely resembles B, ostreae Pichot et al., 1979, which parasitises and is pathogenic in haemocytes of European flat oysters, O. edulis. However, B. ostreae is smaller and denser, and has fewer...
Tipo: Text Palavras-chave: New Zealand; 18S rDNA; Ultrastructure; Ostrea chilensis; Bonamia exitiosus.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-818.pdf
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Caractérisation de bactéries pathogènes, Vibrio splendidus, isolées de bivalves marins ArchiMer
Gay, Melanie; Waechter, Magali; Lambert, Christophe; Escoubas, Jean-michel; Cochennec, Nathalie; Nicolas, Jean-louis; Berthe, Franck; Le Roux, Frédérique.
Nowadays, cupped oyster, Crassostrea gigas, production is the main shellfish production in France. Spats cultivated on most farms are usually collected in the wild, but hatchery spats are becoming more numerous, and represent around 10% of today's cultivated spats. During the summer period, when the temperatures are higher, high mortality rates have been regularly observed in cupped in oyster C. gigas (60 to 100%) spats since 1991, both in hatcheries-nurseries and in their natural habitat. Over the last five years, these episodes have become a big concern for all the professionals.
Tipo: Text Palavras-chave: Crassostrea gigas; Pathogène; Vibrio splendidus; Bactériologie.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3277.pdf
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Certifying the French population of Crassostrea gigas free from exotic diseases : a risk analysis approach ArchiMer
Thebault, Anne; Berthe, Franck; Audige, L..
Sample-size calculation in the context of the surveys aimed at substantiating freedom from infection have been commonly undertaken an terrestrial animals over recent years, but not on aquatic animals. A recent model developed by Audigé and Beckett in 1999 can be used to plan and assess animal health surveys. The aim of this study was to adapt that model for marine aquaculture, in particular to help in planning surveys aimed at substantiating freedom form two exotic diseases, mikrocytosis and perkinsosis, in the French population of Crassostrea gigas. As a first approach, farmed animals are so frequent that it would be very difficult to be representative of a single area or zone. To find the most appropriate sampling scheme, the model was run using @Risk...
Tipo: Text Palavras-chave: Stochastic modelling; Sensitivity modelling; Risk analysis; Oysters; Molluscs; Crassostrea gigas; Certification; Aquatic animal surveys.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-2710.pdf
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Cg-TIMP, un inhibiteur de metalloproteinase isolé chez Crassostrea gigas : étude de son rôle dans la réparation des lésions et dans les mécanismes de défense ArchiMer
Escoubas, Jean-michel; Montagnani, Caroline; Le Roux, Frédérique; De Lorgeril, Julien; Berthe, Franck; Bachere, Evelyne.
We isolated complementary DNA (Cg-TIMP) from Crassostrea gigas that codes for a protein highly homologous to vertebrate tissue inhibitors of metalloproteinases (TIMPs). In vertebrates, TIMPs are multifunctional proteins that play a key role in extracellular matrix metabolism. They are involved in physiological processes (e.g. embryonic development, damage repair, angiogenesis) and pathological processes (e.g. inflammatory reactions, cancer).
Tipo: Text Palavras-chave: Proteine; Cg TIMP; ADN; Crassostrea gigas.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3268.pdf
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Comparative analysis of Vibrio splendidus-related strains isolated during Crassostrea gigas mortality events ArchiMer
Le Roux, Frédérique; Gay, Melanie; Lambert, Christian; Waechter, Magali; Poubalanne, Saravanne; Chollet, Bruno; Nicolas, Jean-louis; Berthe, Franck.
French mollusc production is based mainly on the Pacific cupped oyster, Crassostrea gigas. Since 1991, annual mass mortality of juveniles has been reported during summer months. These recurring episodes concern professionals who fear that like Portugese oyster, C. angulata, C gigas could in turn disappear following one of these epizooties. Previously, bacteriological analysis of moribund oyster juveniles yielded an isolate of a Vibrio splendidus biovar H strain, named TNEMF6. This isolate was demonstrated to be pathogenic to Crassostrea gigas spat by experimental challenge. To study the association between summer oyster mortality and presence of TNEMF6 cluster strains, Vibrionaceae fauna were isolated from infected spat along the French Atlantic coast...
Tipo: Text Palavras-chave: Vibrio splendidus; Virulence; Epidemiology; PCR RFLP; Oyster mortality.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-565.pdf
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Contrat de Plan Etat Région Poitou-Charentes 1994-1998. Convention 95 RPC R 62 - Programme Pathologie - Rapport Scientifique année 1995 ArchiMer
Renault, Tristan; Berthe, Franck; Chollet, Bruno; Cochennec, Nathalie; Haffner, Philippe; Le Deuff, Rose-marie; Thuillier, Benoit.
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: 1995 URL: http://archimer.ifremer.fr/doc/00043/15453/12828.pdf
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Contrat de Plan Etat Région Poitou-Charentes 1994-1998. Convention 96 RPC R70 - Programme Pathologie - Rapport Scientifique année 1996 ArchiMer
Renault, Tristan; Berthe, Franck; Chollet, Bruno; Cochennec, Nathalie; Haffner, Philippe; Le Deuff, Rose-marie; Lipart, Cecile; Thebault, Anne.
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: 1996 URL: http://archimer.ifremer.fr/doc/00043/15452/12827.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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Contrat de Plan Etat Région Poitou-Charentes 1994-1998. Convention 98 RPC R 7 - Programme Pathologie - Rapport Final année 1998 ArchiMer
Renault, Tristan; Berthe, Franck; Thebault, Anne; Lipart, Cecile; Chollet, Bruno; Cochennec, Nathalie; Haffner, Philippe.
Depuis 1991, des mortalités massives sporadiques sont rapportées, en France, de manière régulière chez des larves et des juvéniles de différentes espèces de mollusques bivalves marins. Certains de ces épisodes de mortalité ont pu être associés à la détection de virus. Ces derniers par leur morphologie, leur cycle de réplication et leur localisation ont été apparentés à la famille des Herpesviridae. Cependant, les outils de diagnostic disponibles jusqu'alors (histologie et microscopie électronique à transmission) n'étaient pas adaptés à l'étude de ces virus du fait de leur manque de spécificité et de la lourdeur de leur mise en oeuvre. Par ailleurs, se posait la question de l'implication des virus détectés dans les phénomènes de mortalité observés. En...
Tipo: Text Palavras-chave: Pathologie; Pathogènes; Virus; Herpès virus; Crassostrea gigas; Diagnostic; Herpesviridae.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00043/15455/12830.pdf
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Could Mikrocytos roughleyi be a mis-classified haplosporidian? ArchiMer
Cochennec, Nathalie; Le Roux, Frédérique; Berthe, Franck; Hine, Mike.
Bonamiosis refers to diseases of oysters caused by Bonamia ostreae in the Northern Hemisphere and Bonamia sp. in the Southern Hemisphere. Similarly, Mikrocytosis usually refers to diseases of oysters caused by Mikrocytos mackini on the west coast of Canada and Mikrocytos roughleyi on the east coast of Australia.
Tipo: Text Palavras-chave: Oysters; Diseases; Pathology; Mikrocytos roughleyi.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3286.pdf
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Delta de l'Ebre is a natural bay model for Marteilia spp. (Paramyxea) dynamics and life-cycle studies ArchiMer
Carrasco, N; Arzul, Isabelle; Berthe, Franck; Fernandez Tejedor, M; Durfort, M; Furones, M.
Marteilia spp. are paramyxean parasites that affect several bivalve species of economic interest, such as Ostrea edulis and Mytilus galloprovincialis. Certain aspects of Marteilia spp., such as their life cycle and host affinity and infection dynamics, still remain unknown. The 'Delta de l'Ebre' constitutes a natural model for the study of the life cycle of the parasite Marteilia, since uninfected mussels and flat oysters immersed in the bays can become infected. This, along with the geographical and ecological characteristics of the bays, make it a very interesting location to study the Marteilia life cycle. Preliminary results concerning marteiliosis, mainly in mussels, such as prevalence dynamics, infectious periods, host affinity and host intermediate...
Tipo: Text Palavras-chave: Ebre delta bays; Host specificity; Intermediate host; Mytilus galloprovincialis; Paramyxea; Marteilia.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3880.pdf
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Development and validation of DNA-based diagnostic techniques with particular reference to bivalve mollusc pathogens ArchiMer
Berthe, Franck.
The International Aquatic Animal Health Code of the OIE (the World Organization for Animal Health) includes serious pathogens that have been causing important losses in the mollusc aquaculture industry throughout the world. This list also meets the ones established by the European Union regulation.
Tipo: Text Palavras-chave: Pathogens; Techniques; Diagnostics; Pathology; Molluscs.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/acte-3213.pdf
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Development of a TaqMan PCR assay for the detection of Bonamia species ArchiMer
Corbeil, Serge; Arzul, Isabelle; Diggles, Ben; Heasman, Mike; Chollet, Bruno; Berthe, Franck; Crane, Mark St. J..
The development of molecular diagnostic assays with increased sensitivity compared with conventional histological techniques is highly desirable for effective management of bonamiosis in cultured oyster stocks and wild populations. A real-time TaqMan PCR assay was developed for the specific detection of Bonamia species in infected oyster tissues. The TaqMan assay was shown to be significantly more sensitive than histopathology. Although a real-time TaqMan PCR assay is comparable with conventional PCR in terms of sensitivity, it offers the advantages that it is a rapid test and has a very low risk of sample cross-contamination. Furthermore, it can be optimised to quantify the parasite load in samples. The assay detected Bonamia isolates from Australia, New...
Tipo: Text Palavras-chave: Oyster; Real time TaqMan PCR assay; Bonamia spp..
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1980.pdf
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Diseases in mollusc hatcheries and their paraedox in health management ArchiMer
Berthe, Franck.
Global molluscan aquaculture production is continuously increasing, dominated by five species, among which the Pacific cupped oyster, Crassostrea gigas, predominates. Hatchery production is accompanying this increase to assist consistent availability of juveniles for restocking, fishery enhancement, genetic improvements as well as for species diversification. Hatchery development contributes significantly to the demand for international transfers of live molluscs; a consequence of which pathogen transfer via transfer of live molluscs is currently recognised as a major cause of epizootic disease outbreaks. Diseases are a primary constraint to mollusc aquaculture growth and sustainability, severely impacting socioeconomic development in many countries....
Tipo: Text Palavras-chave: Mollusca; Crassostrea gigas; Risks; Mollusc culture; Husbandry diseases; Hatcheries; Disease control.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3289.pdf
Registros recuperados: 61
Primeira ... 1234 ... Última
 

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