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| Registros recuperados: 74 | |
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| Nicolas, Jean-louis; Corre, S; Gauthier, Gilles; Robert, Rene; Ansquer, Dominique. |
| Scallop Pecten maximus larvae have been cultured at the Argenton and Tinduff (Brittany, France) hatcheries with antibiotic treatment (chloramphenicol at 8 ppm) for 15 yr. Without treatment, outbreak of disease has normally occurred between Day 12 and Day 19 or sometimes earlier. A bacteriological study of larvae reared with and without antibiotic was performed over a 4 yr period. Among the collected strains, 2 clusters (C and F) of vibrios were present at high densities only in larvae cultured without treatment. One cluster (C) was routinely isolated over the 4 yr of study, while the other (F) was collected only in the third year. Their virulence with respect to scallop larvae and their lack of infectivity with respect to oyster larvae were demonstrated in... |
| Tipo: Text |
Palavras-chave: Larvae; Bivalve; Vibrio; Scallop. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00090/20077/17716.pdf |
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| Pernet, Fabrice; Browman, Howard I. |
| Aquaculture now produces more seafood than wild capture fisheries and this production is expected to at least double by 2050. Representing almost half of global production, marine aquaculture will contribute to sustainably feeding the growing humanity. However, climate change will undoubtedly challenge the future growth of marine aquaculture. Temperature and sea-level rise, shifts in precipitation, freshening from glacier melt, changing ocean productivity, and circulation patterns, increasing occurrence of extreme climatic events, eutrophication, and ocean acidification are all stressors that will influence marine aquaculture. The objective of this themed article set was to bring together contributions on the broad theme of the potential impacts,... |
| Tipo: Text |
Palavras-chave: Adaptation; Bivalve; Blue economy; Carbon; Climate change; Marine diseases; Mitigation; Ocean acidification; Plasticity; Salmon; Seaweed; Sustainability. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00682/79406/81951.pdf |
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| Pernet, Fabrice; Lupo, Coralie; Bacher, Cedric; Whittington, Richard J.. |
| Emerging diseases pose a recurrent threat to bivalve aquaculture. Recently, massive mortality events in the Pacific oyster Crassostrea gigas associated with the detection of a microvariant of the ostreid herpesvirus 1 (OsHV-1 µVar) have been reported in Europe, Australia and New Zealand. Although the spread of disease is often viewed as a governance failure, we suggest that the development of protective measures for bivalve farming is presently held back by the lack of key scientific knowledge. In this paper, we explore the case for an integrated approach to study the management of bivalve disease, using OsHV-1 as a case study. Reconsidering the key issues by incorporating multidisciplinary science could provide a holistic under-standing of OsHV-1 and... |
| Tipo: Text |
Palavras-chave: Bivalve; Disease management; Epidemiology; Multidisciplinary; Risk. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00314/42537/41912.pdf |
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| 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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| Dupuy, Christine; Pastoureaud, Annie; Ryckaert, Mireille; Sauriau, Pierre-guy; Montanie, Hélène. |
| To assess the in situ impact of oysters Crassostrea gigas on planktonic protist and bacteria communities and the potential contribution of protozoa to their food resource intake, the abundance and the diversity of protists and bacteria were followed in 2 Atlantic coastal ponds, with and without oysters. The protist biomass in such ponds was high, with a maximum in spring of 982 mug C l(-1) and a minimum in winter of 179 pg C l(-1). Whatever the season, the presence of oysters (20 m(-2) corresponding to an average of 23 mg dry weight m(-2)) induced a significant decrease in >5 pm protist abundance. On the contrary, planktonic organisms <5 pm, such as Chlorophyta flagellates and bacteria, developed similarly in both ponds. It can be assumed that such... |
| Tipo: Text |
Palavras-chave: Trophic link; Bacteria; Protists; Microbial food web; Coastal pond; Food source; Oysters; Bivalve. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-822.pdf |
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| Botana, Luis M.; Hess, Philipp; Munday, Rex; Nathalie, Arnich; Degrasse, Stacey L.; Feeley, Mark; Suzuki, Toshiyuki; Van Den Berg, Martin; Fattori, Vittorio; Gamarro, Esther Garrido; Tritscher, Angelika; Nakagawa, Rei; Karunasagar, Iddya. |
| Background Seafood toxins pose an important risk to human health, and maximum levels were imposed by regulatory authorities throughout the world. Several toxin groups are known, each one with many analogues of the major toxin. Regulatory limits are set to ensure that commercially available seafood is not contaminated with unsafe levels. Scope and Approach The mouse bioassay was used to measure the toxicity in seafood extracts to determine if a sample exceeded regulatory limits. The advantage of this approach was to provide an estimation of the total toxicity in the sample. As instrumental methods of analysis advance and serve as replacements to the mouse bioassay, the challenge is translating individual toxin concentrations into toxicity to determine... |
| Tipo: Text |
Palavras-chave: Marine toxins; Toxicity Equivalency Factors; FAO; WHO; Bivalve; Mollusc. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00358/46960/46874.pdf |
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| Poitevin, Pierre; Thébault, Julien; Siebert, Valentin; Donnet, Sébastien; Archambault, Philippe; Doré, Justine; Chauvaud, Laurent; Lazure, Pascal. |
| The Northwest Atlantic is a key region with an essential role in global climate regulation, redistributing heat and influencing the carbon cycle. However, little is known about its evolution before 1950, mainly because of the lack of long-term instrumental measurements. The hard parts of long-lived marine biota hold the potential to extend instrumentally derived observation by several decades or centuries and enhance our understanding of global climate processes. Here, we investigate the effects of local, regional, and large-scale climate variability on the marine bivalve, Arctica islandica (Linnaeus, 1767) from Saint-Pierre and Miquelon (SPM). This archipelago lies at the boundary zone between the cold Labrador Current in the north and the warm Gulf... |
| Tipo: Text |
Palavras-chave: Arctica islandica; Paleoecology; North Atlantic; Sub polar gyre; Labrador current; Bivalve; Sclerochronology; Climate change. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62050/66198.pdf |
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| Prudence, Marie; Moal, Jeanne; Boudry, Pierre; Daniel, Jean-yves; Quere, Claudie; Jeffroy, Fanny; Mingant, Christian; Ropert, Michel; Bedier, Edouard; Van Wormhoudt, A; Samain, Jean-francois; Huvet, Arnaud. |
| This study investigated the non-neutrality of genetic polymorphism in two alpha-amylase genes (AMYA and AMYB) in the oyster Crassostrea gigas. Bi-parental oyster families, bred to be polymorphic for markers in these genes, were monitored for growth and survival for 1 year under standard culture conditions in two French production sites. Within-family genotype frequencies indicated that the two amylase genes were closely linked (c. 1.7 cM). Within two of three families, significant differences in growth were observed between genotypes at one of the two production sites, suggesting that this polymorphism is not neutral and might be under selection because of its role in digestive function. Estimated daily yields were different between amylase genotypes,... |
| Tipo: Text |
Palavras-chave: Growth; Genotype; Digestive enzyme; Bivalve; Alpha amylase. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1691.pdf |
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| Cavelier, Patricia; Cau, Julien; Morin, Nathalie; Delsert, Claude. |
| While our knowledge of bivalve gametogenesis has progressed in recent times, more molecular markers are needed in order to develop tissue imaging. Here, we identified stem cell and mitotic markers to further characterize oyster early gametogenesis, mainly through immunofluorescence microscopy. Intense alkaline phosphatase activity, a non-specific marker for stem cells, was detected on the outer edge of the gonad ducts at the post-spawning stage, suggesting an abundance of undifferentiated cells very early during the sexual cycle. This observation was confirmed using an antibody against Sox2, a transcription factor specific for stem or germline cells, which labeled cells in the gonad duct inner mass and ciliated epithelium early during the initial oyster... |
| Tipo: Text |
Palavras-chave: Germline cells; Cell cycle; Reproduction; Bivalve; Marine invertebrates. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00409/52100/52809.pdf |
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| Rossi, Francesca; Colao, Elodie; Jose Martinez, Maria; Klein, Judith C.; Carcaillet, Frederique; Callier, Myriam; De Wit, Rutger; Caro, Audrey. |
| Sulphur-oxidising endosymbiont-bearing bivalves often inhabit seagrass meadows, where they can control sulphide levels and variably contribute to carbon cycling, by feeding on endosymbiotic bacteria and/or on particulate organic matter from the water column. The patterns of variability in their feeding mode and their spatial distribution within the seagrass meadows are however poorly studied. Seagrass beds form naturally patchy habitats with seagrass-sand edges that may have variable effects on different organisms. The present study aims at understanding differences in feeding mode and abundance of the endosymbiont-bearing bivalve Loripes lacteus (sensu Poli, 1791) as well as the physiological conditions of its endosymbiotic populations between edge and... |
| Tipo: Text |
Palavras-chave: Bivalve; Food web; Mediterranean; Seagrass; Stable isotopes; Symbiosis. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00138/24911/26373.pdf |
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| Huvet, Arnaud; Jeffroy, F; Fabioux, C; Daniel, Jean-yves; Quillien, Virgile; Van Wormhoudt, A; Moal, Jeanne; Samain, Jean-francois; Boudry, Pierre; Pouvreau, Stephane. |
| To examine further a previously reported association between amylase gene polymorphism and growth in the Pacific oyster Crassostrea gigas, ecophysiological parameters and biochemical and molecular expression levels of alpha-amylase were studied in Pacific oysters of different amylase genotypes. Genotypes that previously displayed significantly different growth were found to be significantly different for ingestion and absorption efficiency. These estimated parameters, used in a dynamic energy budget model, showed that observed ingestion rates (unlike absorption efficiencies) allowed an accurate prediction of growth potential in these genotypes. The observed association between growth and amylase gene polymorphism is therefore more likely to be related to... |
| Tipo: Text |
Palavras-chave: Ingestion; Gene expression; Bivalve; Alpha amylase. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-5165.pdf |
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| Fuhrmann, Marine; Delisle, Lizenn; Petton, Bruno; Corporeau, Charlotte; Pernet, Fabrice. |
| The Pacific oyster, Crassostrea gigas, is an osmoconforming bivalve exposed to wide salinity fluctuations. The physiological mechanisms used by oysters to cope with salinity stress are energy demanding and may impair other processes, such as defense against pathogens. This oyster species has been experiencing recurrent mortality events caused by the Ostreid herpesvirus 1 (OsHV-1). The objectives of this study were to investigate the effect of salinity (10, 15, 25 and 35‰) on energetic reserves, key enzyme activities and membrane fatty acids, and to identify the metabolic risk factors related to OsHV-1-induced mortality of oysters. Acclimation to low salinity led to increased water content, protein level, and energetic reserves (carbohydrates and... |
| Tipo: Text |
Palavras-chave: Bivalve; Disease; Environment; Metabolism; Mortality risk; Salinity. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00427/53886/54958.pdf |
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| Damee, Nicolas. |
| La conservation des échantillons a souvent constitué un problème tant pour les chimistes que pour les biologistes. Si les chimistes semblent satisfaits de leurs techniques de conservation, les biologistes quant à eux sont indécis du fait que l'action toxique se modifie au cours du temps et selon la technique employée (réfrigération, congélation, lyophilisation, conservation en azote liquide à -196°C). Le présent rapport constitue une étude préliminaire qui, si elle est poursuivie, pourrait permettre de déterminer le mode de conservation le plus approprié pour chaque type d'échantillons. |
| Tipo: Text |
Palavras-chave: Conservation; Bio-essai; Pourcentage net d'anomalies (PNA); Sédiment; Bivalve. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00037/14828/12144.pdf |
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| Registros recuperados: 74 | |
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