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| Registros recuperados: 225 | |
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| Renault, Tristan. |
| Among the infectious diseases observed in bivalve molluscs, viral infections are often not well known because of a certain inadequacy of the diagnostic techniques usually applied during instances of mortality. In fact, photonic microscopy was still the base method for analysing specimens in several laboratories working on pathologies in molluscs. This technique is insufficient in the event of a pathology of viral etiology if it is not supplemented by other approaches such as the electronic microscope, research of cytopathogenic effects on cell lines or detection of the infectious agent with the help of specific reagents (specific antibodies and nucleic probes). Moreover, since no bivalve mollusc cell line is currently available, in vitro research of... |
| Tipo: Text |
Palavras-chave: Virologie; Mollusques; Détection; Maladie; Herpesviridae. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/publication-2903.pdf |
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| Arzul, Isabelle; Renault, Tristan. |
| In 1972, Farley reported the presence of herpes-type viral particles in adult American oysters (Crassostrea virginica) for the first time. Since then, this pathogen has been detected in various marine bivalve species, usually associated with massive mortality events. To date, herpes-type viruses have been detected in the following species: C gigas, Ostrea edulis, O. angasi, Tiostrea chilensis, Ruditapes decussatus, R. philippinarum and most recently, Pecten maximus. |
| Tipo: Text |
Palavras-chave: Pathogènes; Bivalves; Herpesvirus; Herpesviridae. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/acte-3266.pdf |
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| Batista, Frederico M.; Lopez-sanmartin, Monserrat; Boudry, Pierre; Navas, Jose I.; Ruano, Francisco; Renault, Tristan; Fonseca, Vera G.; Leitao, Alexandra. |
| Cytogenetic abnormalities associated with viral infections, including from viruses of the Herpesvirales order, have been reported in vertebrate species. Ostreid herpesvirus 1 (OsHV-1) has been detected worldwide during mortality outbreaks of the Pacific oyster Crassostrea gigas. On the other hand, a high proportion of aneuploid cells in somatic tissues have been observed in C. gigas. In this study, we analysed the putative association between aneuploidy levels and the detection of OsHV-1 in gills of C. gigas, the Portuguese oyster C. angulata and their F1 hybrids cultured in Ria Formosa (Portugal). OsHV-1 was detected by PCR in 5.4% of the total of oysters analysed (n = 111) namely in 11.1%, 8.0% and 1.7% of C. gigas, C. angulata and F1 hybrid... |
| Tipo: Text |
Palavras-chave: Aneuploidy; Ostreid herpesvirus 1; Oyster; Crassostrea. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00215/32581/35759.pdf |
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| Faucet, Jerome; Maurice, Manuelle; Gagnaire, Beatrice; Renault, Tristan; Burgeot, Thierry. |
| As the marine mussel Mytilus edulis is commonly used as a sentinel species, it would be useful to develop a primary culture of the target organs most often in contact with the marine environment. This study reports an improved method for dissociating the digestive gland and gills of M. edulis and considers the effect of mussel storage on cell viability and functionality before culture initiation. Viability and enzymatic activities such as those of esterase and peroxidase were monitored by flow cytometry, a sensitive, objective technique allowing large volumes of cells to be counted within a short time. A primary culture of digestive gland showed more than 75% viability after 72 h. Mussels were maintained in an aquarium containing clean, oxygenated seawater... |
| Tipo: Text |
Palavras-chave: Mytilus edulis; Gill; Flow cytometry; Digestive gland; Cell culture. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-936.pdf |
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| Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno; Maffart, Patricia. |
| Progeny of Crassostrea virginica oysters, introduced into France in 1992, were reared during 1992 and 1993, to test their growth performances. These assays were performed to investigate the possible replacement of Crassostrea gigas with a non indigenous species, Crassostrea virginica. During the summer of 1993, sporadic mass mortalities (80-90%) occurred among young, Crassastrea virginica, oysters reared in the IFREMER nursery in La Tremblade (Charente Maritime). |
| Tipo: Text |
Palavras-chave: Histology; Crassostrea virginica; Mortality; Oysters. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/1995/acte-2975.pdf |
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| Francois, Cyrille; Joly, Jean-pierre; Garcia, Celine; Miossec, Laurence; Arzul, Isabelle; Robert, Maeva; Omnes, Emmanuelle; Chollet, Bruno; Renault, Tristan. |
| The Ifremer Repamo network (REseau de PAthologie des MOllusques) is the national surveillance network in charge of monitoring marine mollusc health on French coastlines. It is commissioned to enforce the official regulations and to provide a public service, under the supervision of the competent authority (DGAL Veterinary Directorate) in the Ministry.of Agriculture and Fisheries. Its goals are to prevent the introduction and the dissemination of infectious agents, in particular pathogens involved in reportable diseases, and to monitor the changes in the pathogens already present on the French coasts. |
| Tipo: Text |
Palavras-chave: Network; Surveillance; Mollusks; Pathogens; Regulations. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6946.pdf |
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| Francois, Cyrille; Miossec, Laurence; Garcia, Celine; Arzul, Isabelle; Joly, Jean-pierre; Robert, Maeva; Ferrand, Sylvie; Chollet, Bruno; Renault, Tristan. |
| Created in 1992, the Repamo network (REseau de PAthologie des MOllusques Mollusc Pathology Network) is in charge of the surveillance and monitoring of the marine molluscs health status along the French coast. It has a regulatory mission (European legislation 91/67 and 95/70) as well as a public service activity under the supervision of the Ministry of Agriculture and Fisheries through the DPMA. It aims at preventing the introduction and propagation of pathogenic agents, in particular the noticeable agents, and monitoring the evolution of those already present on the national territory. These activities are part of the institutional missions of the Ifremer. The missions of the network are the following: 1) surveillance of the evolution of noticeable... |
| Tipo: Text |
Palavras-chave: Mortalités; Maladies; Pathologie; Mollusques; Réseau surveillance; REPAMO. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/acte-3715.pdf |
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| Lapegue, Sylvie; Renault, Tristan. |
| The most known and certainly the most important contribution of genetics to the oyster indus try is the development of the triploid cupped oyster. Released for the first time in the 1980s, the triploid oyster has triplets of chromosomes instead of pairs. Currently, triploid oysters are obtained by crossing diploid and tetraploid oysters. These oysters are characterized by a near lack of milt in summer, which makes them generally popular with consumers, and by a faster growth, allowing a shorter production cycle. In parallel, the exploitation of natural resistance in the diversity of French oysters has been considered to improve the health of farmed populations which is a major challenge for the sustainability of aquaculture farms. Currently, the... |
| Tipo: Text |
Palavras-chave: Huître creuse; Triploïdie; Sélection; Maladies; Ostréiculture; Cupped oyster; Triploidy; Selection; Disease; Shellfish farming. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00498/60931/64326.pdf |
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| Renault, Tristan. |
| Although viruses have been associated with mortality outbreaks in different mollusc species, little information is available on their exact affiliation and taxonomic position. Herpes viruses have attracted particular attention because of their economic and ecological impact on both farmed and wild marine molluscs over the past 20 years. Investigations based on molecular approaches have been carried out on the herpes virus infecting Pacific oysters in France. Molecular and ultra-structural data were used to classify the virus under the name ostreid herpesvirus 1 (OsHV-1), as the first known species in the family Malacoherpesviridae. Since 2008, massive mortality outbreaks were reported in several Crassostrea gigas oyster farms in France, Ireland, and the... |
| Tipo: Text |
Palavras-chave: Molluscs; Pacific cupped oyster; Herpes virus; Ostreid herpesvirus 1; Excess mortality. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00069/18000/15562.pdf |
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| Pauletto, Marianna; Segarra, Amelie; Montagnani, Caroline; Quillien, Virgile; Faury, Nicole; Le Grand, Jacqueline; Miner, Philippe; Petton, Bruno; Labreuche, Yannick; Fleury, Elodie; Fabioux, Caroline; Bargelloni, Luca; Renault, Tristan; Huvet, Arnaud. |
| Double-stranded RNA (dsRNA)-mediated genetic interference (RNAi) is a widely used reverse genetic tool for determining the loss-of-function phenotype of a gene. Here, the possible induction of an immune response by long dsRNA was tested in a marine bivalve (Crassostrea gigas), as well as the specific role of the subunit 2 of the nuclear factor kappa B inhibitor (I kappa B2). This gene is a candidate of particular interest for functional investigations in the context of oyster mass mortality events, as Cg-I kappa B2 mRNA levels exhibited significant variation depending on the amount of ostreid herpesvirus 1 (OsHV-1) DNA detected. In the present study, dsRNAs targeting Cg-I kappa B2 and green fluorescent protein genes were injected in vivo into oysters... |
| Tipo: Text |
Palavras-chave: Anti-viral response; RNA interference; Inhibitor of NF-kappa B; Marine bivalve; Ostreid herpesvirus 1. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00409/52011/52698.pdf |
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| Le Deuff, Rose-marie; Renault, Tristan. |
| Among the Iridovirus related infections frequently described on many teleosts fish species, Viral Erythrocytic Necrosis (VEN) (Pinto et al., 1989), Epizootic Haematopoietic Necrosis Virus (EHNV) (Langdon et al., 1988) as weil as Lymphocystis Disease Virus (LDV) are not considered to directly cause fatality. Indeed, Lymphocystis outbreaks of farmed fish could be observed in some cases, as a consequence of a bacterial double infection or cannibalism (Ahne ef al., 1991; Moate et al., 1992). Here, we report for the first time a strong LDV infection, and an additional physical stress responsible for mortalities of reared sea bream, Sparus aurata, from Toulon area, on French Mediterranean coast. Although, since the first report of Lymphocystis in sea bream under... |
| Tipo: Text |
Palavras-chave: Mortalities; Sparus aurata; Fish; Iridovirus. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-2886.pdf |
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| 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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| 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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| Renault, Tristan; Haffner, Philippe; Baudin Laurencien, F.; Breuil, Gilles; Bonami, Jean-robert. |
| Since 1986, an unknown disease causing high mortalities appeared in Ifremer's Pacific OceanologicaI Center (Tahiti) nursery of sea bass (Lates calcarifer). opathology of lesions involving both centraI nervous system (CNS) and eye retina, and the tuation exists in South-East Asian countries (Indonesia, Philippines, Malaysia and Singapore), and in northem Australia. This paper describes the histmorphology of a new fish virus, which is believed to be the aetiological agent of high mortalities among sea bass larvae. |
| Tipo: Text |
Palavras-chave: Virus like; Lates calacrifer; Hatchery; Mortality. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/publication-2885.pdf |
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| Registros recuperados: 225 | |
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