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| Registros recuperados: 59 | |
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| Pouvreau, Stephane; Bernard, Ismael; Le Souchu, Pierrick; Queau, Isabelle; Talarmain, Eric; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Neaud-masson, Nadine; Bedier, Edouard; Fleury, Elodie; Martin, Anne-genevieve; Claude, Serge; Langlade, Aime; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Hitier, Benoist; Robert, Stephane; Guilpain, Patrice; Grizon, James; Seugnet, Jean-luc; Guesdon, Stephane; Quemener, Loic; Repecaud, Michel; Barbot, Stephane; Guillemot, Anne; Nonnotte, Lidwine; Duros, Wenceslas; Bonnat, Armel; Tarot, Stephane; Mille, Dominique; Geay, Amelie; Bouquet, Anne-lise. |
| La conchyliculture, et principalement l’élevage de l’huître creuse, Crassostrea gigas, constitue la principale activité aquacole française. Cette activité repose, en grande partie, sur le recrutement naturel de l’espèce qui assure 70% des besoins en jeunes huîtres (naissain) : cette activité de collecte s’appelle le captage. Les deux principaux centres de captage en France sont les bassins d’Arcachon et de Marennes-Oléron. Or, depuis une dizaine d'années, sur le bassin d'Arcachon, le captage devient très variable: à des années de captage nul (par exemple les années 2002, 2005, 2007) ou faible (2009, 2010, 2011) succèdent des années excellentes voire pléthoriques (les années 2003, 2006, 2008). A Marennes-Oléron, cette variabilité existe, même si elle est... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00135/24649/22682.pdf |
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| Pouvreau, Stephane; Maurer, Daniele; Auby, Isabelle; Soletchnik, Patrick; Mille, Dominique; Bernard, Ismael; Bedier, Edouard. |
| In France, spatfall of Pacific Oysters occurs traditionally in two shellfish area of the south west of France: the Marennes-Oléron bay and the Arcachon basin. The spat collected in both sites ensures approx. 70 % of the need of the French oysters production (the other part is produced in hatcheries). But, since ten years, recruitment have become highly variable especially in Arcachon basin. For instance, in this site, spatfall (assessed at the end of the reproductive season) can vary between 50 oysters per collector to more than 20 000 oysters per collector (Figure 1). This huge variation arise questions from oysters producers and the French National Committee for Shellfish Culture want to get some explanations of the phenomenon. It is well known that... |
| Tipo: Text |
Palavras-chave: Larvae; Reproduction; Recruitment; Spatfall; Crassostrea gigas. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/acte-4543.pdf |
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| Degremont, Lionel; Boudry, Pierre; Soletchnik, Patrick; Bedier, Edouard; Ropert, Michel; Samain, Jean-francois. |
| Three successive generations were produced between 2001 and 2003 to assess to what extent genetic variability exists for survival in juvenile oysters Crassostrea gigas. For each generation, two groups were selected for their high ("R" for resistant) and low ("S" for susceptible) survival. Significant differences in mortality were observed during the first year in Riviere d'Auray (RA) (Brittany-France). However, low and similar mortality were observed for both groups, with no significant difference between groups in the first and second generation in this site, where the first summer is the critical, sensitive period with a clear age effect. In Baie des Veys (BDV) (Normandie-France), where mortalities usually mainly affect adults, mortality between groups,... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Spat; Spatial variations; Survival; Rearing; Mollusc culture; Marine molluscs; Environmental factors; Nursery grounds; Mortality causes; Biological age; Aquaculture techniques. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3385.pdf |
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| Huvet, Arnaud; Degremont, Lionel; Labreuche, Yannick; Daniel, Jean-yves; Dubrunfaut, Thomas; Boudry, Pierre; Haure, Joel; Bedier, Edouard; Ropert, Michel; Herpin, Amaury; Cunningham, Charles; Moal, Jeanne; Samain, Jean-francois. |
| Summer mortality associated with juveniles of the oyster Crassostrea gigas is the result of a complex interaction between the host, pathogens and environment. Divergent selection based on summer survival have been applied to produce families with resistant and susceptible progeny. Here, we describe the use of suppression subtractive hybridization to generate 150 clones that were differentially regulated between resistant and susceptible F2 progeny. The nucleotide sequence of these 150 clones was determined. Among the 25 unique sequences that matched with the products of known genes, those putatively implicated in energy generation (12%) and immune function (16%), systems suspected to be implicated in summer mortality, were extended and analyzed by real... |
| Tipo: Text |
Palavras-chave: Selection; Gene; Genetic; Summer mortality; Crassostrea gigas; Pacific oysters. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3447.pdf |
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| Degremont, Lionel; Boudry, Pierre; Bedier, Edouard; Ropert, Michel; Soletchnik, Patrick; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois. |
| The French project "Morest", coordinated by IFREMER, aims to understand the causes of the summer mortalities in Crassostrea gigas. In 2001, three sets of families were bred following a nested half-sib mating design. 17 half-sib families (HSF) were obtained in this first generation (G1) and reared in 3 sites. Significant differences in survival were observed among HSF, and some HSF showed high levels of mortality in all sites, clearly indicating a genetic basis for survival. In 2002, a second generation (G2), including divergent selection and inbred lines, was constituted. Monitoring of survival and growth of G2s were the same as in 2001. Significant differences in survival were found between the offspring of the "high" and "low" selected groups and between... |
| Tipo: Text |
Palavras-chave: Summer; Oyster culture; Juveniles mortality; Genetics; Commercial species; Breeding. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-3346.pdf |
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| Degremont, Lionel; Boudry, Pierre; Soletchnik, Patrick; Bedier, Edouard; Ropert, Michel; Samain, Jean-francois. |
| Three successive generations were produced between 2001 and 2003 to assess to what extent genetic variability exists for this trait in juvenile oysters Crassostrea gigas. For each generation, two groups were selected for their high ("R" for resistant) and low ("S" for susceptible) survival. Significant differences of mortality were observed during the first year in Rivière d'Auray (RA) (Brittany-France). However, low and similar mortality were observed for both groups, with no significant difference between groups in the first and second generation in this site, where the first summer is the critical sensitive period with a clear age effect. In Baie des Veys (BDV) (Normandie-France), where mortalities usually mainly affect adults, mortality between... |
| Tipo: Text |
Palavras-chave: Genetic variability; Genetic; Summer mortality; Crassostrea gigas; Pacific oysters. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3442.pdf |
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| Garcia, Celine; Arzul, Isabelle; Chollet, Bruno; Francois, Cyrille; Goubet, Anne; Joly, Jean-pierre; Miossec, Laurence; Robert, Maeva; Cuvelier, Nicolas; Lefebvre, Alain; Le Gagneur, Eric; Ropert, Michel; Mouillard, Gilbert; Gerla, Daniel; Le Gal, Dominique; Rocher, Gregory; Langlade, Aime; Bedier, Edouard; Nourry, Max; Martin, Jean-louis; Costantini, Louis; Masson, Jean-claude; Martin, Anne-genevieve. |
| Created in 1986, the REPAMO network (Network of mollusc pathology), is a national zoosanitary surveillance network of shellfish health status along the French coasts. Its activities are in keeping with two European Directives, 91 /67/EEC and 95/70/EC and are a patt of the institutional tasks ofIfremer. The aims of the network are to prevent the introduction and spread of exotic pathogens and to survey the evolution of notifiable pathogens already present in France. The network focused on the survey of listed diseases (bonamiosis and marteiliosis of flat oyster) in two areas under agreement process (Banc de Granville and zone X). In 2004, no sample couId be analysed to these two areas because of the difficulty to obtain flat oysters (sparse oyster beds,... |
| Tipo: Text |
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Etat de santé; Network; Surveillance; Pathology; Molluscs; Shellfish; Health status. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00086/19702/17343.pdf |
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| Mazurie, Joseph; Langlade, Aime; Fleury, Pierre-gildas; Bouget, Jean-francois; Claude, Serge; Foucart, Marie; Bedier, Edouard. |
| This study is the second part of a former report rapport Ifremer DRV/RST/RA/LCB/2002-08 dealing with rearing methods, growth and mortality performances, and problems encountered by the oyster farmers from Quiberon Bay (2800 ha of leases) : the first report relied on a survey achieved in july 200l, about 18 oyster farmers, and 2 diving campaigns (july and october 2001) on 2 years old oyster batches from the same farmers. Il is now completed by a last campaign of diving in october 2002, on 7 parcels out of the 18, still bearing the initial oysters. The analysed enterprises vary in particular by the location and depth of their concession inside the bay, but also by their rearing scheme : a majority favours seedings with 18 month old oysters or more, according... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassastrea gigas; Baie de Quiberon; Croissance; Mortalité; Pratiques culturales; Rentabilité économique; Cupped oyster; Crassostrea gigas; Mortality; Rearing practices; Profitability; Bay of Quiberon; .growlh. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00102/21322/18944.pdf |
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| Samain, Jean-francois; Ropert, Michel; Bedier, Edouard; Soletchnik, Patrick; Mazurie, Joseph; Le Coz, Florence; Blin, Jean-louis; Mille, Dominique; Pajot, Régis; Haffray, Patrick; Bacher, Cedric; Grangere, Karine; Grangere, Karine; Pouvreau, Stephane; Bourles, Yves; Gohin, Francis; Woerther, Patrice; Boudry, Pierre. |
| Summer mortality has been reported in the Pacific oyster, Crassostrea gigas, for many years in Japan, US and Europe. It affects both adults and juveniles and the causes of this phenomenon are complex. Environmental, physiological or pathological putative causes were studied all over the world. Recently, the MOREST project ((MORtalitEStivale) a multidisciplinary project (2001-2005) focused on his problem led to a better understanding of this phenomenon in France. The results showed in these geographical conditions, the main interactions between the oysters, their environment and certain pathogens. |
| Tipo: Text |
Palavras-chave: Interaction model; Environmental parameters; Summer mortality; Crassostrea gigas; Pacific oyster. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/2006/acte-3476.pdf |
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| Soletchnik, Patrick; Ropert, Michel; Bedier, Edouard; Costil, K. S.; Dubois, Brice; Degremont, Lionel; Bouget, Jean-francois; Martin, Jean-louis; Enriquez-diaz, M.; Faury, Nicole; Le Moine, Olivier; Renault, Tristan; Gagnaire, Beatrice; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois. |
| Field characterization of summer mortality was performed in France in the frame of the Morest project. Natural and hatchery spat were compared between three oyster production areas in France. Regardless of the natural or hatchery origin, oysters died during the reproduction period after temperature reaches 19 degree C. Thus, in southern areas, temperature accelerated gametogenesis of small spat (10mm) as well as adults, and mortality appeared for the two age classes. In contrast, sexual maturation proceeded more slowly in northern where spat mortality was lower compared to 18 months old oysters. However, critical gametogenesis and temperature were not sufficient to induce mortalities, as observed in examples with stable environment. Alternatively sediment... |
| Tipo: Text |
Palavras-chave: Seasonal variation; Oyster culture; Mortality causes; Hatcheries; Gametogenesis; Environmental factors; Crassostrea gigas; Oysters. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-3348.pdf |
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| Robert, Stephane; Bedier, Edouard. |
| Le réseau national d’observation de la moule bleue MYTILOBS a été mis en place en 2012 sur le littoral atlantique en réponse aux interrogations sur les mauvais résultats rencontrés sur la croissance et la qualité des moules sur bouchot, dans certaines zones de production, les trois années précédentes, notamment en 2011. Sa mise à l’eau, prévue en décembre 2011, a été repoussée au mois de mars 2012. Des cinq régions productrices de moules sur bouchot, quatre ont été retenues comme sites test. Chaque région est identifiée par une zone géographique et un lieu dit : la Bretagne Nord en baie du Mont Saint Michel par Le Vivier-sur-mer, La Bretagne Sud en baie de Vilaine par Pont Mahé, Les Pays de Loire dans le Pertuis Breton par l’Aiguillon, le Poitou-Charentes... |
| Tipo: Text |
Palavras-chave: Mytilus edulis; Moules; Bouchot; Mortalité; Croissance; Température; Phytoplancton; Réseau; Biométrie; Environnement. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00166/27720/25914.pdf |
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| Degremont, Lionel; Maurouard, Elise; Nourry, Max; Seugnet, Jean-luc; Bedier, Edouard; Fleury, Elodie; Langlade, Aime; Pernet, Fabrice; Pouvreau, Stephane; Le Souchu, Pierrick; Normand, Julien; D'Amico, Florence; Rumebe, Myriam; Cantin, Christian; Barret, Jean; Le Gall, Patrik; Baud, Jean-pierre; Cochennec-laureau, Nathalie; Gervasoni, Erika; Pelissier, Pablo. |
| Ce rapport présente la comparaison des mortalités de deux lots de naissains de Crassostrea gigas dans plusieurs bassins conchylicoles et déterminer le gain de survie obtenu par la sélection pour des huîtres diploïdes |
| Tipo: Text |
Palavras-chave: Mortalités; Huître creuse; Crassostrea gigas; Sélection génétique; Naissain. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00065/17644/15180.pdf |
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| Ropert, Michel; Rauflet, Fabienne; Soletchnik, Patrick; Geairon, Philippe; Bedier, Edouard; Bouget, Jean-francois. |
| Temperature affects undoubtedly the 3 working sites where, systematically, the observation of the first abnormal mortalities coincides with a water temperature of around 19°C. The nature of the processes implied could have a "cumulative" effect, affecting the physiology (this phenomenon has been observed with other marine species) or a "threshold" effect, acting only as a trigger. The question has not been answered yet. The kinetics of the thermic evolution around the mortality period has to be studied in depth in order to understand if this temperature acts more as an "associated factor", during a chronic stress period, or during an acute stress, as suggested by the "on-bottom/off bottom" mortality model of the Marennes Oléron Bay [12]. |
| Tipo: Text |
Palavras-chave: MOREST; Mortalité; Stress; Température; Risque thermique; Physiologie; Crassostrea gigas; Huîtres. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3408.pdf |
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| Marchand, Michel; Amouroux, Isabelle; Bedier, Edouard; Belin, Catherine; Claisse, Didier; Daniel, Anne; Denis, Jacques; Lampert, Luis; Le Mao, Patrick; Maisonneuve, Christine; Ropert, Michel. |
| L’Ifremer opère de façon coordonnée à l’échelle de l’ensemble du littoral métropolitain plusieurs réseaux de surveillance : le réseau de contrôle microbiologique (REMI), le réseau de surveillance du phytoplancton et des phycotoxines (REPHY), le réseau d’observation de la contamination chimique (ROCCH, ex-RNO) et le réseau de surveillance benthique (REBENT). Ils sont mis en oeuvre pour répondre aux objectifs environnementaux de la Directive Cadre sur l’Eau (DCE), aux obligations des Conventions régionales marines (OSPAR et Barcelone) et aux objectifs sanitaires réglementaires concernant le suivi de la salubrité des coquillages des zones de pêche et de production conchylicoles. La surveillance de la survie et de la croissance des mollusques est assurée par... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00032/14346/11630.pdf |
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| Ropert, Michel; Mazurie, Joseph; Bedier, Edouard; Le Coz, Florence; Soletchnik, Patrick. |
| L'objectif de ce thème est de préciser les relations entre Mortalités et Environnement, en déclinant cette relation à travers les "risques environnementaux" caractérisés depuis le début du programme MOREST. La température, les bassins versant etlou l'eau douce, la ressource trophique, le compartiment sédimentaire, autant de facteurs impliqués directement ou indirectement dans les processus de mortalités de Crassostrea gigas. Ces facteurs d'influence "externe" sont étudiés à différentes échelles d'espace ("nationale", "régionale", "sites") et de temps (annuelle, mensuelle, bimensuelle, journalière, horaire, infra horaire) en s'appuyant sur des données issues de bases institutionnelles (REMORA', REPHY~, METEO-FRANCE) et sur les résultats de terrain obtenus... |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00304/41536/40744.pdf |
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| Marchand, Michel; Amouroux, Isabelle; Bedier, Edouard; Belin, Catherine; Claisse, Didier; Durand, Gaetane; Soudant, Dominique. |
| Ce document constitue une synthèse nationale proposée en complément des bulletins de la surveillance publiés chaque année par les Laboratoires Environnement Ressources (LER) de l’Ifremer. Elle présente les principaux résultats obtenus jusqu’en 2008 par les différents réseaux de surveillance, réseau de contrôle microbiologique (REMI), réseau de surveillance phytoplancton et phycotoxines (REPHY), réseau d’observation de la contamination chimique (ROCCH) et réseau mollusques des ressources aquacoles (REMORA). Le réseau de contrôle microbiologique (REMI) permet d’évaluer les niveaux de contamination microbiologique dans les coquillages et de détecter les épisodes de contamination. Les données de surveillance permettent également d’estimer la qualité... |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00014/12573/9443.pdf |
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| Bedier, Edouard. |
| Determination of rearing data enabled production of sea bass fry for three years in Station DEVA-SUD, CNEXO, France. The larval breeding process is described. The food consists of the ROlÎfer Brachionus plicatilis, then nauplii and 1 mm long metanauplii of the Brachiopod Artemia salina. Weaning on dry pellets oceurs when larvae are 35 days old when an optimum temperature curve is respected. Production of season 1977-78 was 380 000 two month old weaned fry. |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00342/45288/44752.pdf |
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| Degremont, Lionel; Boudry, Pierre; Bedier, Edouard; Ropert, Michel; Soletchnik, Patrick; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois. |
| In the scope of the Morest program, 3 series of bi-parental families of cupped oyster consisting of full and half-sib have been created in 2001, and then studied on a regular basis on several sites over the summer period. In October, major survival differences had been demonstrated between the 3 families. The average survival rate for the half-sib families monitored on the three sites varies from 17 to 97 %. Some of them showed high mortality for the three sites, indicating a strong genetic basis (h2 = 0.81 - 0.29) to the variations observed regarding survival. To a lesser extent, growth differences between the studied half-sib families indicate a weaker heritability for this character. .... |
| Tipo: Text |
Palavras-chave: Physiologie; Génétique; Naissain; Sélection; Croissance; Survie; Huîtres; Crassostrea gigas. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-3490.pdf |
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| Pouvreau, Stephane; Le Souchu, Pierrick; Breerette, Stephane; Claude, Serge; Langlade, Aime; Bouget, Jean-francois; Hitier, Benoist; Martin, Anne-genevieve; Bedier, Edouard. |
| Dans le cadre d’un réseau national (VELYGER), la Baie de Bourgneuf (partie Nord de la Baie) a fait l’objet en 2009 d’un suivi détaillé de la reproduction de l’huître creuse, Crassostrea gigas : gamétogenèse et ponte des adultes, abondance et développement larvaire ainsi qu’intensité et survie du captage sur collecteurs. Les résultats de ce suivi ont été mis en ligne, sous la forme de bulletin hebdomadaire, en temps quasi-réel sur le site : http://www.ifremer.fr/velyger. Il ressort, en 2009, que : (1) la gamétogenèse des huîtres s’est déroulée favorablement en permettant une ponte massive dans la première quinzaine de juillet, plus précoce mais aussi plus importante que sur des sites traditionnels (Arcachon et Marennes-Oléron) ; (2) les larves ont été... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12273/9064.pdf |
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| Registros recuperados: 59 | |
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