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Registros recuperados: 46
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Cod (Gadus morhua) rearing attempts in France ArchiMer
Suquet, Marc; Omnes, Marie-helene; Normant, Yvon; Petton, Bruno; Severe, Armelle; Fauvel, Christian; Barone, Herve; Quemener, Loic; Buchet, Vincent; Pasco, Laurent; Menard, E; Gaignon, Jean-louis.
Because of its rapid growth, its good reputation and the promising aquaculture experiences conducted in Norway and Scotland, cod is considered as a good candidate for cold water aquaculture. The aim of this paper is to present the work carried out in France since 1999: the selection of cod as a promising candidate for aquaculture and the assessment of its rearing performances in this environment.
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00170/28142/26362.pdf
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Bilan des « Journées Surmortalité des huîtres creuses, Crassostrea gigas » du Programme P7 « Aquaculture Durable » des 8 et 9 décembre 2009 ArchiMer
Cochennec-laureau, Nathalie; Baud, Jean-pierre; Bedier, Edouard; Boudry, Pierre; Huvet, Arnaud; Nicolas, Jean-louis; Pepin, Jean-francois; Petton, Bruno.
Ce bilan comprend deux parties : la première est dédiée à une synthèse des travaux présentés lors des journées « Surmortalités des huîtres creuses, Crassostrea gigas » les 8 et 9 décembre 2009 et, la seconde partie, à une proposition d'un projet de recherche spécifique 2010-2012 en complément des propositions de « sortie de crise ». Contexte Les mortalités estivales de l'huître creuse, Crassostrea gigas, sont décrites depuis une vingtaine d'années en France mais également au Japon, en Corée, aux USA et en Australie. Ces phénomènes ou « syndrome des mortalités estivales » ont fait l'objet d'une étude pluridisciplinaire en France entre 2001 et 2006 (Défi MOREST). Toutefois, en 2008 et 2009, l'ostréiculture française a du faire face à deux épisodes de...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/acte-7393.pdf
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Influence of feeding regime and temperature on development and settlement of oyster Ostrea edulis (Linnaeus, 1758) larvae ArchiMer
Robert, Rene; Vignier, Julien; Petton, Bruno.
Under controlled conditions of food density and temperature, larval performances (ingestion, growth, survival and settlement success) of the flat oyster, Ostrea edulis, were investigated using a flow-through rearing system. In the first experiment, oyster larvae were reared at five different phytoplankton densities (70, 500, 1500, 2500 and 3500 μm3 μL−1: ≈1, 8, 25, 42 and 58 cells μL−1 equivalent TCg), and in the second, larvae were grown at four different temperatures (15, 20, 25 and 30°C). Overall, larvae survived a wide range of food density and temperature, with high survival recorded at the end of the experiments. Microalgae concentration and temperature both impacted significantly larval development and settlement success. A mixed diet of Chaetoceros...
Tipo: Text Palavras-chave: Ostrea edulis; Larvae; Temperature; Feeding regime; Flow-through; DEB parameters.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00377/48817/49295.pdf
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Nanoplastics impaired oyster free living stages, gametes and embryos ArchiMer
Tallec, Kevin; Huvet, Arnaud; Di Poi, Carole; Gonzalez-fernandez, Carmen; Lambert, Christophe; Petton, Bruno; Le Goic, Nelly; Berchel, Mathieu; Soudant, Philippe; Paul-pont, Ika.
In the marine environment, most bivalve species base their reproduction on external fertilization. Hence, gametes and young stages face many threats, including exposure to plastic wastes which represent more than 80% of the debris in the oceans. Recently, evidence has been produced on the presence of nanoplastics in oceans, thus motivating new studies of their impacts on marine life. Because no information is available about their environmental concentrations, we performed dose-response exposure experiments with polystyrene particles to assess the extent of micro/nanoplastic toxicity. Effects of polystyrene with different sizes and functionalization (plain 2-μm, 500-nm and 50-nm; COOH-50 nm and NH2-50 nm) were assessed on three key reproductive steps...
Tipo: Text Palavras-chave: Oyster; Embryos; Gametes; Microplastics; Nanoplastics.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00453/56419/58090.pdf
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Immune-suppression by OsHV-1 viral infection causes fatal bacteraemia in Pacific oysters ArchiMer
De Lorgeril, Julien; Lucasson, Aude; Petton, Bruno; Toulza, Eve; Montagnani, Caroline; Clerissi, Camille; Vidal-dupiol, Jeremie; Chaparro, Cristian; Galinier, Richard; Escoubas, Jean Michel; Haffner, Philippe; Degremont, Lionel; Charriere, Guillaume; Lafont, Maxime; Delort, Abigail; Vergnes, Agnes; Chiarello, Marlene; Faury, Nicole; Rubio, Tristan; Leroy, Marc; Perignon, Adeline; Regler, Denis; Morga, Benjamin; Alunno-bruscia, Marianne; Boudry, Pierre; Le Roux, Frederique; Destoumieux-garzon, Delphine; Gueguen, Yannick; Mitta, Guillaume.
Infectious diseases are mostly explored using reductionist approaches despite repeated evidence showing them to be strongly in fluenced by numerous interacting host and environmental factors. Many diseases with a complex aetiology therefore remain misunderstood. By developing a holistic approach to tackle the complexity of interactions, we decipher the complex intra-host interactions underlying Pacific oyster mortality syndrome affecting juveniles of Crassostrea gigas, the main oyster species exploited worldwide. Using experimental infections reproducing the natural route of infection and combining thorough molecular analyses of oyster families with contrasted susceptibilities, we demonstrate that the disease is caused by multiple infection with an initial...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00461/57234/59228.pdf
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A single regulatory gene is sufficient to alter Vibrio aestuarianus pathogenicity in oysters ArchiMer
Goudenege, David; Travers, Marie-agnes; Lemire, Astrid; Petton, Bruno; Haffner, Philippe; Labreuche, Yannick; Tourbiez, Delphine; Mangenot, Sophie; Calteau, Alexandra; Mazel, Didier; Nicolas, Jean-louis; Jacq, Annick; Le Roux, Frederique.
Oyster diseases caused by pathogenic vibrios pose a major challenge to the sustainability of oyster farming. In France since 2012 a disease affecting specifically adult oysters has been associated with the presence of Vibrio aestuarianus. Here, by combining genome comparison, phylogenetic analyses and high throughput infections of strains isolated before or during the recent outbreaks, we show that virulent strains cluster into two V. aestuarianus lineages independently of the sampling dates. The bacterial lethal dose was not different between strains isolated before or after 2012. Hence the emergence of a new highly virulent clonal strain is unlikely. Each lineage comprises nearly identical strains, the majority of them being virulent, suggesting that...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00226/33685/32530.pdf
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Connectivities with shellfish farms and channel rivers are associated with mortality risk in oysters ArchiMer
Gangnery, Aline; Normand, Julien; Duval, Cyrielle; Cugier, Philippe; Grangeré, Karine; Petton, Bruno; Petton, Sebastien; Orvain, Francis; Pernet, Fabrice.
Oyster diseases have major consequences on fisheries and aquaculture. In France, young Pacific oysters Crassostrea gigas are severely hit by the ostreid herpesvirus, whereas adults suffer mortalities presumably caused by pathogenic bacteria. Here we investigated the origin and spread of mortalities that affect both young and adult oysters, and we identified and compared their risk factors. Mortality was monitored in 2 age classes of oysters deployed in early spring at 39 sites spread over a 37 km2 surface area inside and outside of shellfish farms. Environmental data obtained from numerical modelling were used to investigate risk factors. Mortality of young oysters associated with ostreid herpesvirus occurred in the oyster farming area. Hydrodynamic...
Tipo: Text Palavras-chave: Aquaculture; Bivalve; Disease; Epidemiology and health; Ecological modelling; Hydrodynamic connectivity.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00588/69983/67896.pdf
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Populations, not clones, are the unit of vibrio pathogenesis in naturally infected oysters ArchiMer
Lemire, Astrid; Goudenege, David; Versigny, Tiphaine; Petton, Bruno; Calteau, Alexandra; Labreuche, Yannick; Le Roux, Frederique.
Disease in oysters has been steadily rising over the past decade, threatening the long-term survival of commercial and natural stocks. Our understanding and management of such diseases are of critical importance as aquaculture is an important aspect of dealing with the approaching worldwide food shortage. Although some bacteria of the Vibrio genus isolated from diseased oysters have been demonstrated to be pathogenic by experimental infection, direct causality has not been established. Little is known about the dynamics of how the bacterial population hosted by oysters changes during disease progression. Combining experimental ecology, a high-throughput infection assay and genome sequencing, we show that the onset of disease in oysters is associated with...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00244/35565/34107.pdf
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Species-specific mechanisms of cytotoxicity toward immune cells determine the successful outcome of Vibrio infections ArchiMer
Rubio, Tristan; Oyanedel, Daniel; Labreuche, Yannick; Toulza, Eve; Luo, Xing; Bruto, Maxime; Chaparro, Cristian; Torres, Marta; De Lorgeril, Julien; Haffner, Philippe; Vidal-dupiol, Jeremie; Lagorce, Arnaud; Petton, Bruno; Mitta, Guillaume; Jacq, Annick; Le Roux, Frederique; Charriere, Guillaume; Destoumieux-garzon, Delphine.
Vibrio species cause infectious diseases in humans and animals, but they can also live as commensals within their host tissues. How Vibrio subverts the host defenses to mount a successful infection remains poorly understood, and this knowledge is critical for predicting and managing disease. Here, we have investigated the cellular and molecular mechanisms underpinning infection and colonization of 2 virulent Vibrio species in an ecologically relevant host model, oyster, to study interactions with marine Vibrio species. All Vibrio strains were recognized by the immune system, but only nonvirulent strains were controlled. We showed that virulent strains were cytotoxic to hemocytes, oyster immune cells. By analyzing host and bacterial transcriptional...
Tipo: Text Palavras-chave: T6SS; Toxin; Dual RNA-seq; Cytolysis; Pathogenesis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00507/61837/65900.pdf
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Determination of risk factors for herpesvirus outbreak in oysters using a broad-scale spatial epidemiology framework ArchiMer
Pernet, Fabrice; Fuhrmann, Marine; Petton, Bruno; Mazurie, Joseph; Bouget, Jean-francois; Fleury, Elodie; Daigle, Gaetan; Gernez, Pierre.
Marine diseases have major impacts on ecosystems and economic consequences for aquaculture and fisheries. Understanding origin, spread and risk factors of disease is crucial for management, but data in the ocean are limited compared to the terrestrial environment. Here we investigated how the marine environment drives the spread of viral disease outbreak affecting The Pacific oyster worldwide by using a spatial epidemiology framework. We collected environmental and oyster health data at 46 sites spread over an area of 300 km2 along an inshore-offshore gradient during an epizootic event and conducted risk analysis. We found that disease broke out in the intertidal farming area and spread seaward. Mortalities and virus detection were observed in oysters...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00450/56130/57670.pdf
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Influence of one selected Tisochrysis lutea strain rich in lipids on Crassostrea gigas larval development and biochemical composition ArchiMer
Da Costa, F.; Petton, Bruno; Mingant, Christian; Bougaran, Gael; Rouxel, Catherine; Quere, Claudie; Wikfors, G. H.; Soudant, P.; Robert, Rene.
Effects of a remarkably high overall lipid Tisochrysis lutea strain (T+) upon gross biochemical composition, fatty acid (FA), sterol and lipid class composition of Crassostrea gigas larvae were evaluated and compared with a normal strain of Tisochrysis lutea (T) and the diatom Chaetoceros neogracile (Cg). In a first experiment, the influence of different single diets (T, T+ and Cg) and a bispecific diet (TCg) was studied, whereas, effects of monospecific diets (T and T+) and bispecific diets (TCg and T+Cg) were evaluated in a second experiment. The strain T+ was very rich in triglycerides (TAG: 93–95% of total neutral lipids), saturated FA (45%), monounsaturated FA (31–33%) and total fatty acids (4.0–4.7 pg cell−1). Larval oyster survival and growth rate...
Tipo: Text Palavras-chave: Larvae; Lipids; Oyster; Tisochrysis lutea.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00251/36258/36063.pdf
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Differential basal expression of immune genes confers Crassostrea gigas resistance to Pacific Oyster Mortality Syndrome ArchiMer
De Lorgeril, Julien; Petton, Bruno; Lucasson, Aude; Perez, Valérie; Stenger, Pierre-louis; Degremont, Lionel; Montagnani, Caroline; Escoubas, Jean Michel; Haffner, Philippe; Allienne, Jean-françois; Leroy, Marc; Lagarde, Franck; Vidal Dupiol, Jeremie; Gueguen, Yannick; Mitta, Guillaume.
Background: As a major threat to the oyster industry, Pacific Oyster Mortality Syndrome (POMS) is a polymicrobial disease affecting the main oyster species farmed across the world. POMS affects oyster juveniles and became panzootic this last decade, but POMS resistance in some oyster genotypes has emerged. While we know some genetic loci associated with resistance, the underlying mechanisms remained uncharacterized. So, we developed a comparative transcriptomic approach using basal gene expression profiles between different oyster biparental families with contrasted phenotypes when confronted to POMS (resistant or susceptible). Results: We showed that POMS resistant oysters show differential expression of genes involved in stress responses, protein...
Tipo: Text Palavras-chave: Pacific oyster; Oyster disease; Resistance; OsHV-1; Antiviral molecular pathways; Invertebrate immunity..
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00602/71369/69811.pdf
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Interaction between toxic dinoflagellate Alexandrium catenella exposure and disease associated with herpesvirus OsHV-1μVar in Pacific oyster spat Crassostrea gigas ArchiMer
Lassudrie, Malwenn; Soudant, Philippe; Nicolas, Jean-louis; Fabioux, Caroline; Lambert, Christophe; Miner, Philippe; Le Grand, Jacqueline; Petton, Bruno; Hegaret, Helene.
Blooms of toxic dinoflagellates can co-occur with mass mortality events associated with herpesvirus OsHV-1 μVar infection that have been decimating Pacific oyster Crassostrea gigas spat and juveniles every summer since 2008 in France. This study investigated the possible effect of a harmful dinoflagellate, Alexandrium catenella, a producer of Paralytic Shellfish Toxins (PSTs), upon the oyster spat–herpesvirus interaction. Oyster spat from a hatchery were challenged by cohabitation with oysters contaminated in the field with OsHV-1 μVar and possibly other pathogens. Simultaneously, the oysters were exposed to cultured A. catenella. Infection with OsHV-1 μVar and PST accumulation were measured after 4 days of experimental exposure. Exposure to Alexandrium...
Tipo: Text Palavras-chave: Crassostrea gigas; OsHV-1 mu Var; Harmful algal blooms; Alexandrium; Host-pathogen interaction; PST accumulation.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00269/38000/36101.pdf
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Low pH reduced survival of the oyster Crassostrea gigas exposed to the Ostreid herpesvirus 1 by altering the metabolic response of the host ArchiMer
Fuhrmann, Marine; Richard, Gaëlle; Quere, Claudie; Petton, Bruno; Pernet, Fabrice.
Environmental change in the marine realm has been accompanied by emerging diseases as new pathogens evolve to take advantage of hosts weakened by environmental stress. Here we investigated how an exposure to reduced seawater pH influenced the response of the oyster Crassostrea gigas to an infection by the Ostreid herpesvirus type I (OsHV-1). Oysters were acclimated at pH 8.1 or pH 7.8 and then exposed to OsHV-1. Their survival was monitored and oyster tissues were sampled for biochemical analyses. The survival of oysters exposed to OsHV-1 at pH 7.8 was lower (33.5%) than that of their counterparts at pH 8.1 (44.8%) whereas levels of OsHV-1 DNA were similar. Energetic reserves, fatty acid composition and prostaglandin levels in oyster did not vary...
Tipo: Text Palavras-chave: Acidification; Bivalve; Disease; Environment; Metabolism; Mortality risk.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00472/58334/60887.pdf
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Long dsRNAs promote an anti-viral response in Pacific oyster hampering ostreid herpesvirus 1 replication ArchiMer
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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Ancestral gene acquisition as the key to virulence potential in environmental Vibrio populations ArchiMer
Bruto, Maxime; Labreuche, Yannick; James, Adele; Piel, Damien; Chenivesse, Sabine; Petton, Bruno; Polz, Martin F.; Le Roux, Frederique.
Diseases of marine animals caused by bacteria of the genus Vibrio are on the rise worldwide. Understanding the eco-evolutionary dynamics of these infectious agents is important for predicting and managing these diseases. Yet, compared to Vibrio infecting humans, knowledge of their role as animal pathogens is scarce. Here we ask how widespread is virulence among ecologically differentiated Vibrio populations, and what is the nature and frequency of virulence genes within these populations? We use a combination of population genomics and molecular genetics to assay hundreds of Vibrio strains for their virulence in the oyster Crassostrea gigas, a unique animal model that allows high-throughput infection assays. We show that within the diverse Splendidus...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00452/56370/57967.pdf
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Influence of low temperatures on the survival of the Pacific oyster (Crassostrea gigas) infected with Ostreid herpesvirus type 1 ArchiMer
Pernet, Fabrice; Tamayo, David; Petton, Bruno.
Mortalities of oyster seed of Crassostrea gigas associated with ostreid herpes virus OsHV-1 μVar have been observed in many oyster producing countries since 2008. The objective of this study was to further investigate whether low temperature treatments can offer a viable option to mitigate oyster mortalities. An experiment was set-up to further evaluate the effect of low temperature treatments (10 and 13°C vs. 21°C) and their duration (6 d to 83 d) on the survival of oysters previously infected with OsHV-1 μVar by means of exposure to field conditions in areas where mortalities were occurring. Average survival of oysters infected with OsHV-1μVar was 71% after 83 d at low temperatures compared to only 23% in controls maintained at 21°C. During...
Tipo: Text Palavras-chave: Bivalve; Disease; OsHV-1; Oyster; Temperature; Virus.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00259/37047/35555.pdf
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Temperature modulate disease susceptibility of the Pacific oyster Crassostrea gigas and virulence of the Ostreid herpesvirus type 1 ArchiMer
Delisle, Lizenn; Petton, Bruno; Burguin, Jean Francois; Morga, Benjamin; Corporeau, Charlotte; Pernet, Fabrice.
Temperature triggers marine diseases by changing host susceptibility and pathogen virulence. Oyster mortalities associated with the Ostreid herpesvirus type 1 (OsHV-1) have occurred seasonally in Europe when the seawater temperature range reaches 16–24 °C. Here we assess how temperature modulates oyster susceptibility to OsHV-1 and pathogen virulence. Oysters were injected with OsHV-1 suspension incubated at 21 °C, 26 °C and 29 °C and were placed in cohabitation with healthy oysters (recipients) at these three temperatures according to a fractional factorial design. Survival was followed for 14 d and recipients were sampled for OsHV-1 DNA quantification and viral gene expression. The oysters were all subsequently placed at 21 °C to evaluate the potential...
Tipo: Text Palavras-chave: Bivalve; Health; Marine disease; Mortality risk; Temperature; Virulence.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00442/55337/56847.pdf
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Qualification zoo-sanitaire du naissain de captage 2014 de l'huître creuse Crassostrea gigas (QUALIF) - Détection précoce des maladies en épreuve thermique de laboratoire ArchiMer
Petton, Bruno; Le Grand, Jacqueline; Riobe, Marion; Mingant, Christian; Ratiskol, Dominique; Petton, Sebastien; Alunno-bruscia, Marianne.
Depuis 2008, des mortalités massives d’huîtres creuses âgées de moins d’un an sont relevées sur le littoral français dès que la température de l’eau de mer atteint le seuil de 16°C. Ces mortalités de naissains sont associées à la détection du virus OsHV-1 μVar. Depuis 2010, des travaux de qualification zoo-sanitaire ont montré qu’environ un lot de naissains de captage sur deux était infecté par le virus avant l’apparition des mortalités dans le milieu naturel. En 2014, dans le cadre de la première action QUALIF, les résultats de la qualification zoo-sanitaire des naissains du captage de l’année 2013 à l’échelle nationale ont mis en évidence le caractère infectieux des maladies développées par ces naissains porteurs latents d’OsHV-1 μVar. L’objectif 2015 du...
Tipo: Text Palavras-chave: Huitre creuse; Naissain; Maladie; OsHV-1 μVar; Epreuve thermique.; Pacific oyster; Seed; Disease; OsHV-1 μVar; Thermal challenge..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00335/44587/44305.pdf
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Scallop larval survival from erythromycin treated broodstock after conditioning without sediment ArchiMer
Holbach, Marine; Robert, Rene; Boudry, Pierre; Petton, Bruno; Archambault, Philippe; Tremblay, Rejean.
Pathogenic bacteria are known to be one of the main factors affecting Pecten maximus larval survival in hatcheries. As a result, juvenile production often relies on the use of antibiotics during larval culture. However, limitations of the usage of chemicals such as chloramphenicol in aquaculture have been reinforced due to their negative environmental impact and alternatives are accordingly needed. Thus, the importance of bacterial transfer from oocytes to larvae has been studied here as well as procedures to limit larval mortality in P. maximus. In order to reduce bacterial contamination during larval development, we focused on two periods, broodstock conditioning and post-fertilization. The animals were conditioned for 2 months with two erythromycin...
Tipo: Text Palavras-chave: Scallop; Broodstock conditioning; Larval survival; Vibriosis.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00240/35171/33675.pdf
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