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Bilan des connaissance et des enjeux relatifs aux ressources marines de l'estuaire de l'Odet ArchiMer
Billy, Stéphany; Peronnet, Isabelle.
The estuary of the Odet, which can be defined as a ria, is an integral part of SAGE, taken on by SIVALODET. This space was hardly studied and it seemed important to perform a full assessment of knowledge and issues relating to this ria's fragile and unstable ecosystem. This assessment must be performed according to several points of focus; it must first of all strive to retrace the history of the fisheries in the Odet, then make it possible to identify as clearly as possible the marine habitats that make up this site. With that, it must then bring to light the potential resources of the estuary and finally resituate the Odet in relation to the other Breton estuaries.
Tipo: Text Palavras-chave: Water quality; Shellfish farming; Parasite; Oysters; Bonamia ostrea; Marteilia refringens; Odet estuary; Brittany; Parasite; Huître; Qualité de l'eau; Habitats de l'Odet; Nourriceries de l'Odet; Marteilia refringens; Bonamia ostrea; Réglementation de la pêche; Estuaire de l'Odet; Bretagne.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-2334.pdf
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Characterization of the protozoan parasite Marteilia refringens infecting the dwarf oyster Ostrea stentina in Tunisia ArchiMer
Elgharsalli, Refka; Aloui-bejaoui, Nejla; Sala, Hedi; Chollet, Bruno; Joly, Jean-pierre; Robert, Maeva; Couraleau, Yann; Arzul, Isabelle.
Marteilia refringens is a protozoan parasite recognized as a significant pathogen of the European flat oyster Ostrea edulis. The life cycle of this species is still poorly known, although there is evidence of the need for intermediate host(s). In the present study, we have used molecular approaches to identify this parasite in samples of the dwarf oyster Ostrea stentina after reports of massive mortality along the Tunisian coasts. In 2009 we evaluated the status of O. stentina from Monastir and checked if there was an infection with M. refringens, using polymerase chain reaction assays. Of the 103 tested O. stentina, 85 were PCRpositive using a Marteilia genus-specific assay. Additional assays were subsequently carried out on some samples collected in 2010...
Tipo: Text Palavras-chave: Marteilia refringens; Molecular diagnosis; IGS; ITS; Transmission electron microscopy; Ostrea stentina.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00124/23538/21422.pdf
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Compléments d'observations sur le cycle du parasite, Marteilia refringens (Grizel et coll. 1974) ArchiMer
Tige, Gilbert; Grizel, Henri; Langlade, Aime; Rabouin, Marie-agnès.
Les premiers stades connus du parasite ont été mis en évidence en Bretagne pendant les mois de juillet et d'août (GRIZEL et TIGE, 1977). Suite à ces observations, un essai a été réalisé en 1978 pour savoir si l'infestation avait bien lieu à ces dates ou si elle se faisait antérieurement sous une forme non décelée actuellement et subissant des transformations profondes dans les tissus de l'huître. Les résultats montrent que l'infestations se fait effectivement pendant l'été, à partir du mois de juillet jusqu'à la fin du mois d'août. Elle fut dans l'ensemble faible; les lots les plus infestés sont ceux qui ont séjourné le plus longtemps en zone contaminée.
Tipo: Text Palavras-chave: Ostrea edulis; Marteilia refringens; Pathologie; Parasite.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/acte-6098.PDF
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Contribution to the understanding of the cycle of the protozoan parasite Marteilia refringens ArchiMer
Arzul, Isabelle; Chollet, Bruno; Boyer, S.; Bonnet, D.; Gaillard, Juliette; Baldi, Yoann; Robert, Maeva; Joly, Jean-pierre; Garcia, Celine; Bouchoucha, Marc.
The paramyxean parasite Marteilia refringens infects several bivalve species including European flat oysters Ostrea edulis and Mediterranean mussels Mytilus galloprovincialis. Sequence polymorphism allowed definition of three parasite types ‘M’, ‘O’ and ‘C’ preferably detected in oysters, mussels and cockles respectively.Transmission of the infection from infected bivalves to copepods Paracartia grani could be experimentally achieved but assays fromcopepods to bivalves failed. In order to contribute to the elucidation of the M. refringens life cycle, the dynamics of the infection was investigated in O. edulis, M. galloprovincialis and zooplankton over one year in Diana lagoon, Corsica (France). Flat oysters appeared non-infected while mussels were infected...
Tipo: Text Palavras-chave: Bivalves; Marteilia refringens; Copepods; Paracartia latisetosa; Zooplankton; Parasite life cycle.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00165/27635/25768.pdf
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Does the prevalence of Bonamia and Marteilia diseases be reduced on flat oysters (Ostrea edulis) of Atlantic and Mediterranean origin, when they are reared together with the Japanese oyster (Crassostrea gigas) in tidal ponds? ArchiMer
Bodoy, Alain; Bougrier, Serge; Geairon, Philippe; Garnier, Jacqueline; Boulo, Viviane; Heurtebise, Serge.
The flat oyster Ostrea edulis was originally reared in several regions of the European waters. The tidal saline ponds on the Atlantic coasts of France were highly productive before being hit by two consecutive epizooties. Parasitic diseases were described on this species, both of them leading 10 economic losses, as heavy mortalities have usually been recorded before the oysters reach the commercial size. Repeated experiments showed that the two diseases, Marteilia refringens and Bonamia ostreae are still active in this environment. Recently, some evidences were given that haemocytoblasts of Crassostrea gigas had the ability to lyze the Bonamia cells. Therefore, in an experiment of contiguous culture of the two species of oysters, the growth, mortality and...
Tipo: Text Palavras-chave: Molluscs; Mortalities; Growth; Pathology; Crassostra gigas; Ostrea edulis; Marteilia refringens; Bonamia ostreae.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-3049.pdf
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Données sur la situation de la maladie de l'huître plate, Ostrea edulis L. ArchiMer
Grizel, Henri; Tige, Gilbert; Rabouin, Marie-agnès.
Throughout the years 1974-1975, the flat oyster (Ostrea edulis Linné) disease has gradually spread to most of the French oyster culture centres and caused very important losses in farmed oysters and natural deposits. This note analyses the current evolution of the epizooty; to do so, we differentiate three types of flat oyster culture centres: Centres affected in the past by the epizooty and where the traditional flat oyster culture has become uncertain. It has been replaced by the culture of Crassostrea gigas and by the finishing, for 7 to 8 months, of flat oysters aged 3 or 4 years old which remained of good quality. Centres recently touched by the epizooty where the culture of flat oysters (18 months and 2 years old) from unharmed spat is still possible...
Tipo: Text Palavras-chave: Marteilia refringens; Pathologie; Ostrea edulis; Huître.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/acte-5928.PDF
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Ecologie du copépode calanoïde Paracartia grani. Implication dans le cycle de vie du parasite Marteilia refringens dans la lagune de Thau ArchiMer
Boyer, Séverine.
In this study, the life cycle of Paracartia grani, a calalloid copepod belonging to the Acartiidae family was determined in Thau lagoon. Indeed, the copepod involvement in the life cycle of the parasite Marteilia refringens affecting the bivalve productions is suspected. Mesozooplanktonic community .was monitored twice a month. over two years at a fixed station in the lagoon. Sampling has identified P. grani as the acartiid dominant species in summer. From April to January, the copepod is found in the water column while from February to early April it remains in the sediment as diapausing eggs. The analysis of the population structure (size spectmm, contribution of developmental stages and sex ratio) has revealed that there are in between 6 and 9...
Tipo: Text Palavras-chave: Paracartia grani; Cycle de vie; Production d'oeufs; Oeufs de diapause; Mésozooplancton; Marteilia refringens; Mytilus galloprovincialisa; Ruditapes decussatus; PCR; Hybridation in situ; Lagune de Thau; Paracartia grani; Life cycle; Egg production; Diapause eggs; Mesozooplankton; Marteilia refringens; Mytilus galloprovincialis; Ruditapes decussatus; PCR; In situ hybridization; Thau lagoon.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00118/22931/21482.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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Epidémiologie moléculaire des espèces Marteilia en Europe ArchiMer
Le Roux, Frédérique; Audemard, Corinne; Cochennec, Nathalie; Thebault, Anne; Berthe, Franck.
Responsible for massive epizootics, the Marteilia type parasites are very dangerous infectious agents for oysters. As a matter of fact, in France the spreading out of the parasitosis caused by Marteilia refringens disturbed dangerously the flat oyster, Ostrea edulis, production; destroying a large percentage of the farms on the Atlantic coast. The fight against marteiliose implies a good management of the contamination risk, that is to say the identification of the parasite(s), the characterization of the host(s), vector(s) or reservoir(s) and the understanding of the parasite's transmission mode.
Tipo: Text Palavras-chave: Bivalves; Biologie Moléculaire; Marteilia refringens; Epidémiologie.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3271.pdf
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Essai de culture de l'huître plate Ostrea edulis dans le bassin d'Arcachon. Résultats préliminaires ArchiMer
Robert, Rene; Pichot, Yves; Comps, Michel.
From 1988 to 1989, a study has been conducted pertaining to the growth of the flat oyster Ostrea edulis, as well as Marteilia refringens and Bonamia ostreae outbreaks. Commercial mono specific farming (flat oysters), with low density or mixed (flat and hollow oysters) along with higher density, has been taking place in the Arcachon basin oceanographic sectors, where main hydrobiological parameters were acquired simultaneously. The excellent growth of the flat oyster was witnessed in mono specific farming. However this growth was average in mixed farming, probably due to higher total oyster density and interspecies competition. Regardless of the type of farming, Marteilia refringens infection was very quick and may have been related to climatic bay water...
Tipo: Text Palavras-chave: Basin of Arcachon; Pathology; Bonamia ostreae; Marteilia refringens; Growth; Ostrea edulis; Bassin d'Arcachon; Pathologie; Bonamia ostreae; Marteilia refringens; Croissance; Ostrea edulis.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/rapport-1592.pdf
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Etude de la dynamique des populations zooplanctoniques au sein d'une claire ostréicole ArchiMer
Sajus, Marie-celine.
Marteilia refringens est un protozoaire parasite de l'huître plate Ostrea edulis, à l'origine de mortalités dramatiques en élevage depuis les années 1970. En zone endémique, le seul moyen de contrôle de la marteiliose, est une gestion du risque de contamination. Dans ce cadre, la connaissance du cycle parasitaire de Marteilia refringens est primordiale. Les travaux réalisés à ce sujet ont permis de poser l'hypothèse d'un cycle hétéroxène. Le parasite a été détecté par PCR puis localisé au sein des tissus par hybridation in situ au sein d'une espèce de copépode Calanoide prélevée dans une claire ostréicole. A ce stade, cette espèces peut être considéré comme un hôte de Marteilia refringens. Notre étude consistait à mettre en évidence la dynamique des...
Tipo: Text Palavras-chave: Marteilia refringens; Parasitologie; Huître plate; Ostrea edulis; Eau de mer; Zooplancton; Claires ostréicoles.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00032/14351/11635.pdf
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Etude de la dynamique du parasite Marteilia refringens chez son hôte Ostrea edulis ArchiMer
Barnaud, Antoine.
Après une synthèse des principaux agents pathogènes en conchyliculture, l'auteur présente le protozoaire Marteilia refringens, parasite majeur de l'huître plate Ostrea edulis en Europe, dont le cycle reste inconnu. Suit une étude expérimentale de la dynamique du parasite dans l'huître, intégrée à un modèle d'étude de la marteiliose en claire ostrécole, montrant l'existence d'une fenêtre temporelle d'infection et aboutissant à une nouvelle hypothèse de cycle parasitaire. Ces résultats sont enfin mis en relation avec la détection récente de Marteilia refringens dans le copépode Acartia grani, hôte intermédiaire potentiel.
Tipo: Text Palavras-chave: Marteilia refringens; Ostrea edulis; Huître; Conchyliculture; Pathologie; Paramyxea.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00109/22038/19683.pdf
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Etude du cycle de Marteilia refringens dans l'Etang de Thau ArchiMer
Comps, Michel.
Since the beginning of the epizooty of the flat oyster Ostrea edulis on the Atlantic coast (Comps, 1970), it has been observed that the parasitosis did not develop in the Mediterranean Sea in oysters from the Thau lagoon even though a large part of the culture is made up of young oysters from Brittany. However, some episodic studies only rarely found the presence of Marteilia refringens in the oysters from the lagoon.
Tipo: Text Palavras-chave: Marteilia refringens; Ostrea edulis; Pathologie; Parasite.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/acte-6078.PDF
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Etude d'un lot de moules transférées dans un centre touché par l'épizootie affectant l'huître plate ArchiMer
Tige, Gilbert; Rabouin, Marie-agnès.
L'examen de Mytilus edulis sur coupes histologiques révélant la présence de différents stade de Marteilia refringens, (Grizel et coll. 1974), nous avons essayé de vérifier si ce mollusque était un hôte accidentel ou non de Marteilia refringens. Pour cela, un lot de moules provenant d'une rivière non atteinte par l'épizootie, fut placé en élevage, de Novembre 1974 à Mars 1976, en rivière de Penzé, centre touché par la maladie. Au cours de l'essai, seul un faible pourcentage de moules se parasitait, le lot de moules restait de bonne qualité et les mortalités étaient minimes.
Tipo: Text Palavras-chave: Mytilus edulis; Pathologie; Parasite; Marteilia refringens.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/00015/12624/9509.pdf
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Experimental transmission of Marteilia refringens with special consideration of its life cycle ArchiMer
Berthe, Franck; Pernas, Maria; Zerabib, Maamar; Haffner, Philippe; Thebault, Anne; Figueras, Antonio.
Ever since its first description the paramyxean parasite Marteilia refringens has been recognised as one of the most significant pathogens of bivalve molluscs. The existence of a complex life cycle has been postulated by many authors. However, the transmission route of M. refringens and its life cycle remain unresolved. Experimental observations are presented here that may help lead to a satisfactory hypothesis of the M. refringens life cycle. Trials were performed to test the infectivity of purified early and late stages of M. refringens by different routes of inoculation. Horizontal transmission was also tested by cohabitation with carriers in experimental tanks. Field cohabitation and exposure to natural sources of the parasite helped examine the role...
Tipo: Text Palavras-chave: Marteilia refringens; Ostrea edulis; Transmission trial.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-2742.pdf
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Impact de Marteilia refringens et de Bonamia ostreae sur l'ostréiculture bretonne ArchiMer
Grizel, Henri.
Two successive diseases struck the flat oyster Ostrea edulis farms in Brittany. These two epizooties lead to some changes in the farming practices. The oyster culture developed towards the open ocean, in the sublitoral part. New techniques have been developed for the culture and collection. The flat oyster has been partially replaced by the cupped oyster Crassostrea gigas whose production went from 3 000 to 16 000 tonnes. They also had heavy consequences on the regional economy. The important mortalities decimated the stocks. The production dropped by about 17 000 tonnes from 1910 to 1982. For the same period of time, profits from the sale of the produced flat oysters dropped from 131.6 million to 65.2 million francs. Numerous companies reduced the surface...
Tipo: Text Palavras-chave: Bonamia ostreae; Marteilia refringens; Crassostrea gigas; Crassostrea angulata; Ostrea edulis; Huître; Pathologie.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-5924.PDF
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In situ hybridization detection of initial infective stages of Marteilia refringens (Paramyxea) in its host Mytilus galloprovincialis ArchiMer
Carrasco, N; Arzul, Isabelle; Berthe, Franck; Furones, M.
Tipo: Text Palavras-chave: Mussel; Marteilia refringens; In situ hybridization; Gills; Early stages; Connective tissue.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3941.pdf
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Infection dynamics of Marteilia refringens in flat oyster Ostrea edulis and copepod Paracartia grani in a claire pond of Marennes-Oleron Bay ArchiMer
Audemard, Corinne; Sajus, Marie-céline; Barnaud, Antoine; Sautour, Benoît; Sauriau, Pierre-guy; Berthe, Franck.
The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M refringens in French shallow-water oyster ponds ('claires'). This study reconsidered M refringens transmission dynamics in the light of this finding, taking into account not only oyster infection dynamics and environmental factors but also data concerning the copepod host. P. grani population dynamics in the claire under study revealed that this species is the dominant planktonic copepod in this confined ecosystem. During winter, M refringens overwintered in O. edulis, with P. grani...
Tipo: Text Palavras-chave: Claire pond; Infection dynamics; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-2858.pdf
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Marteilia refringens and Marteilia pararefringens sp. nov. are distinct parasites of bivalves and have different European distributions ArchiMer
Kerr, R.; Ward, G. M.; Stentiford, G. D.; Alfjorden, A.; Mortensen, S.; Bignell, J. P.; Feist, S. W.; Villalba, A.; Carballal, M. J.; Cao, A.; Arzul, Isabelle; Ryder, D.; Bass, D..
Marteilia refringens causes marteiliosis in oysters, mussels and other bivalve molluscs. This parasite previously comprised two species, M. refringens and Marteilia maurini, which were synonymized in 2007 and subsequently referred to as M. refringens ‘O-type’ and ‘M-type’. O-type has caused mass mortalities of the flat oyster Ostrea edulis. We used high throughput sequencing and histology to intensively screen flat oysters and mussels (Mytilus edulis) from the UK, Sweden and Norway for infection by both types and to generate multi-gene datasets to clarify their genetic distinctiveness. Mussels from the UK, Norway and Sweden were more frequently polymerase chain reaction (PCR)-positive for M-type (75/849) than oysters (11/542). We did not detect O-type in...
Tipo: Text Palavras-chave: Marteilia refringens; Marteilia pararefringens; ITS1 rDNA; IGS rDNA; Paramyxida; Ascetosporea; Mytilus edulis; Ostrea edulis.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00444/55566/57177.pdf
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Needle in a haystack: involvement of the copepod Paracartia grani, in the life-cycle of the oyster pathogen Marteilia refringens ArchiMer
Audemard, Corinne; Le Roux, Frédérique; Barnaud, Antoine; Collins, Catherine; Sautour, B; Sauriau, Pierre-guy; De Montaudouin, X; Coustau, C; Combes, C; Berthe, Franck.
Marteilia refringens is a major pathogen of the European flat oyster, Ostrea edulis Linnaeus. Since its description, the lifecycle of this protozoan parasite has eluded discovery. Attempts to infect oysters experimentally have been unsuccessful and led to the hypothesis of a complex life-cycle involving several hosts. Knowledge of this life-cycle is of central importance in order to manage oyster disease. However, the exploration of M. refringens life-cycle has been previously limited by the detection tools available and the tremendous number of species to be screened in enzootic areas. In this study, these two restrictions were circumvented by the use of both molecular detection tools and a mesocosm with low biodiversity. Screening of the entire fauna of...
Tipo: Text Palavras-chave: Experimental transmission; In situ hybridization; PCR; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-2778.pdf
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