Consulta: creatorFacets:"Bedier, Edouard"
Registros recuperados: 59
Data/hora: 11/06/2024 09:41:39

Observer, Analyser et Gérer la variabilité de la reproduction et du recrutement de l’huître creuse en France : Le Réseau Velyger. Rapport annuel 2011
Provedor de dados: 5
Autores: 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
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00135/24649/22682.pdf

Temporal variability in the Pacific oyster spatfall along the French Coast: a new monitoring project
Provedor de dados: 5
Autores: 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

Effects of age and environment on the summer mortality in cupped oyster Crassostrea gigas during the first two years
Provedor de dados: 5
Autores: 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

Selective breeding to improve resistance against summer mortality in the Pacific oyster Crassostrea gigas : results after 3 generations
Provedor de dados: 5
Autores: Boudry, Pierre; Degremont, Lionel; Bedier, Edouard; Samain, Jean-francois.
Summer mortality of adults and juveniles has been reported in the Pacific oyster, Crassostrea gigas, for many years and in several countries. The French multidisciplinary program "Morest" aims to investigate the causes of the summer mortality in Crassostrea gigas. Within this program, we designed multi-site field experiments to assess to what extent genetic variability exists for summer mortality in French populations of C. gigas and to determine whether selective breeding could improve survival.
Tipo: Text
Palavras-chave: Growth; Resistance; Selective breeding; Genetic; Crassostrea gigas; Pacific oyster; Summer mortality.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-3448.pdf

The identification of genes from the oyster Crassostrea gigas that are differentially expressed between progeny exhibiting opposed susceptibility to summer mortality
Provedor de dados: 5
Autores: 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

Genetic basis of summer mortality in juvenile cupped oysters
Provedor de dados: 5
Autores: 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

Effect of age and environment on the summer mortality in cupped oyster Crassostrea gigas during the first two years
Provedor de dados: 5
Autores: 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

Bilan 2004 du réseau REPAMO - Réseau national de surveillance zoosanitaire des mollusques marins
Provedor de dados: 5
Autores: 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

Pratiques culturales et mortalités d'huîtres creuses Crassostrea gigas en baie de Quiberon, en 2001-2002. Bilan des enquêtes, plongées et prélèvements sur 18 semis en 2001-2002
Provedor de dados: 5
Autores: 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

Possibilities to prevent Crassostrea gigas oyster summer mortality in France
Provedor de dados: 5
Autores: 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

Characterization of summer mortalities of C. gigas oyster in France in relation to environmental parameters
Provedor de dados: 5
Autores: 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

Réseau national d'observation de la moule bleue Mytilus edulis - MYTILOBS. Campagne 2012
Provedor de dados: 5
Autores: 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

Suivi national des mortalités au stade naissain d'un lot témoin et d'un lot à survie améliorée pour Crassostrea gigas
Provedor de dados: 5
Autores: 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

Le risque thermique : caractérisation des environnements thermiques des 3 sites atliers de MOREST en lien avec les mortalités observées sur le terrain
Provedor de dados: 5
Autores: 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

Qualité du milieu marin littoral. Synthèse nationale de la surveillance Edition 2010
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00032/14346/11630.pdf

Défi MOREST - Mortalités estivales de l'huître creuse Crassostrea gigas - Caractérisation des facteurs de risques associés au mortalites estivales - Synthèse du thème I - Évaluation des risques dans les écosystèmes conchylicoles. (La Rochelle 14- 15 mars 2006)
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00304/41536/40744.pdf

Qualité du Milieu Marin Littoral. Synthèse Nationale de la Surveillance. Edition 2009
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00014/12573/9443.pdf

Pilot scale production of sea bass (Dicentrarchus labrax) fry
Provedor de dados: 5
Autores: 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
Ano: 1981
URL: http://archimer.ifremer.fr/doc/00342/45288/44752.pdf

Mortalités estivales et croissance du naissain de l'huître creuse Crassostrea gigas : étude de familles sélectionnées
Provedor de dados: 5
Autores: 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

Reproduction de l’huître creuse, Crassostrea gigas, en Baie de Bourgneuf : Mise en place d’un suivi en 2009 dans le cadre du projet national Velyger
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12273/9064.pdf

Summer mortality in juvenile cupped oysters : response to selection in the field and in laboratory
Provedor de dados: 5
Autores: Degremont, Lionel; Bedier, Edouard; Soletchnik, Patrick; Ropert, Michel; Samain, Jean-francois; Boudry, Pierre.
The French project "Morest", coordinated by IFREMER, aims to a better understanding of the causes of summer mortalities in juvenile oysters by a multidisciplinary approach. Within this program, a first generation (G1) was bred in 2001 to assess to what extent genetic variability exists for this trait in French populations. 17 half-sib families (HSF) including 44 full-sib families (FSF) were obtained in the G1, and each FSF was reared in three sites along the French coast during the summer period. Significant differences in survival were observed among HSF, clearly indicating a genetic basis for survival. Estimation of heritability for survival was very high: 0.81 &amp;#61617; 0.29. In 2002, 3 "good" HSF and 3 "bad" HSF were selected on their survival...
Tipo: Text
Palavras-chave: Selection; Genetic; Mortalities; Crassostrea gigas; Oyster.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3439.pdf

Réseau national de suivi des performances de l'huître creuse (Crassostrea gigas). Synthèse des résultats des stations nationales REMORA. Année 2006
Provedor de dados: 5
Autores: Bedier, Edouard; Claude, Serge; Simonne, Charlotte; D'Amico, Florence; Palvadeau, Hubert; Guilpain, Patrice; Le Gall, P; Pien, S.
En 2006, le cheptel d'origine d'huîtres adultes présentait un poids moyen individuel de 28,8g. La mise à l'eau s'est effectuée entre le 13 et le 17 mars 2006 sur les stations Manche et Atlantique et le 20 mars en Méditerranée. Au niveau national, la croissance observée en 2006 pour les adultes s'avère bonne, avec des valeurs supérieures à la moyenne en Normandie (+9,6%), en Bretagne Nord (+24,7%) et dans les Pays de la Loire (+11,7%). En revanche, les performances sont médiocres dans le bassin d'Arcachon (-13,3%). En Méditerranée, le poids atteint en décembre est plus faible que la normale (-8,5%), en raison des conditions de malaïgues qui ont prévalu sur l'étang de Thau. Sur les autres secteurs, les croissances sont moyennes. Les mortalités observées chez...
Tipo: Text
Palavras-chave: Remora; Qualité; Croissance; Mortalité; Basse Normandie; Remonor; Huître creuse; Crassostrea gigas; Remora; Quality; Growth; Mortality; Normandy; Remonor; Cupped (gigas) oyster; Crassostrea gigas.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-3642.pdf

Genetic and reproduction strategy in Crassostrea gigas mortality
Provedor de dados: 5
Autores: Moal, Jeanne; Bedier, Edouard; Fleury, Pierre-gildas; Langlade, Aime; Le Coguic, Yvette; Degremont, Lionel; Boudry, Pierre; Le Coz, Jean-rene; Pouvreau, Stephane; Enriquez-diaz, M.; Lambert, Christophe; Quere, Christele; Soudant, Philippe; Samain, Jean-francois.
Bi-parental families were produced in hatchery and tested in the field in 2001. Two sets of 5 families were constituted, selected on their high (R) and low (S) survival. These two sets were reared in Brittany from March to November 2002. Samplings were performed twice a month to obtain data on biometry, survival, reproductive cycle, biochemical composition, adenylate energy charge, hemolymph parameters (ions and defense system) and muscle strength. "R" and "S" oysters exhibited different reproductive effort and spawning strategy. "R" oysters allocated less energy in gonad than "S" ones and presented a complete spawning at the end of August contrary to the "S" which spawns partially. Mortality started in July when the seawater temperature reached 19 degree...
Tipo: Text
Palavras-chave: Summer; Reproduction; Oyster culture; Mortality; Genetic diversity; Commercial species; Breeding.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3345.pdf

Les surmortalités des naissains d’huîtres creuses, Crassostrea gigas : acquis des recherches en 2010
Provedor de dados: 5
Autores: Cochennec-laureau, Nathalie; Baud, Jean-pierre; Pepin, Jean-francois; Benabdelmouna, Abdellah; Soletchnik, Patrick; Lupo, Coralie; Garcia, Celine; Arzul, Isabelle; Boudry, Pierre; Huvet, Arnaud; Pernet, Fabrice; Bachere, Evelyne; Bedier, Edouard; Petton, Bruno; Gaussem, Florian; Stanisiere, Jean-yves; Degremont, Lionel.
Depuis 2008, la filière ostréicole française doit faire face à des surmortalités exceptionnelles des naissains d’huîtres creuses, Crassostrea gigas, (huîtres de moins d’un an) comprises entre 60 et 90% dans tous les sites d’élevage. Des cas de mortalité similaires ont été décrits en Irlande, dans les îles anglo-normandes, au Portugal en 2009 et au Royaume-Uni en 2010. Récemment deux épisodes de mortalité, associés à la présence d’un virus OsHV1 μvar (ou un variant très proche) ont été également décrits en Nouvelle Zélande (décembre 2010) et en Australie (janvier 2011) soulignant la vulnérabilité de la filière ostréicole dans le monde. L’objectif de ce document est de faire un point sur les recherches menées depuis l’apparition de ce phénomène et de...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14423/11719.pdf

Bilan 2007 du réseau REPAMO - Réseau national de surveillace de la santé des mollusques marins
Provedor de dados: 5
Autores: Francois, Cyrille; Garcia, Celine; Arzul, Isabelle; Chollet, Bruno; Ferrand, Sylvie; Joly, Jean-pierre; Miossec, Laurence; Robert, Maeva; Cuvelier, Nicolas; Le Gagneur, Eric; Ropert, Michel; Mouillard, Gilbert; Gerla, Daniel; Annezo, Jean-pierre; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Nourry, Max; Martin, Jean-louis; Chabirand, Jean-michel; Fillon, Alain; Robert, Stephane; Courtois, Olivier; D'Amico, Florence; Rumebe, Myriam; Pichot, Yves; Le Gall, Patrik; Bouchoucha, Marc; Baldi, Yoann; Ravel, Christophe.
Créé en 1992, le réseau REPAMO (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s'inscrit dans le cadre de deux Directives Européennes, les Directives 91 /67/CEE et 95/70/CE. Les objectifs du réseau sont de prévenir l'introduction et la propagation d'organismes pathogènes, en particulier ceux à déclaration obligatoire et de surveiller l'évolution de ceux déjà présents sur le territoire national. Ces activités font parties des missions institutionnelles de l'IFREMER. La surveillance assurée par le réseau vise en premier lieu les infections à déclaration obligatoire présentes en France, la bonamiose à Bonamia ostreae et la Marteiliose à Marteilia refringens chez l'huître...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Mollusques; Coquillages; Santé.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00086/19708/17349.pdf

Projet Velyger (2008-2010) : Observer, Analyser et Gérer la variabilité du recrutement de l’huître creuse en France. Rapport de synthèse
Provedor de dados: 5
Autores: Pouvreau, Stephane; Bernard, Ismael; Le Souchu, Pierrick; Huvet, Arnaud; Talarmain, Eric; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Neaud-masson, Nadine; Bedier, Edouard; Martin, Anne-genevieve; Claude, Serge; Langlade, Aime; Bouget, Jean-francois; Hitier, Benoist; Stanisiere, Jean-yves; Breerette, Stephane; Robert, Stephane; Guilpain, Patrice; Seugnet, Jean-luc; Guesdon, Stephane; Soletchnik, Patrick; Le Moine, Olivier; Dumas, Franck; Quemener, Loic; Barbot, Stephane; Repecaud, Michel; Mille, Dominique; Geay, A; Bouquet, Anne-lise.
L’ostréiculture constitue la principale activité aquacole française. Cette activité de quasi-monoculture, basé sur l’élevage de l’huître creuse, Crassostrea gigas, repose en grande partie sur le recrutement naturel de l’espèce qui assure 70% des besoins en jeunes huîtres (naissain). Or, depuis une dizaine d'années, dans les bassins d'Arcachon et de Marennes-Oléron, principaux centres de captage français pour l’huître creuse, la collecte du naissain ou captage devient encore plus variable qu’auparavant: à des années de captage presque nul (par exemple les années 2002, 2005, 2007) succèdent des années où il est surabondant (par exemple les années 2003 ou 2006). En parallèle, et probablement en raison du progressif réchauffement des eaux, la reproduction de...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00054/16489/13995.pdf

Bilan 2009 du réseau REPAMO - Réseau national de surveillace de la santé des mollusques marins
Provedor de dados: 5
Autores: Francois, Cyrille; Joly, Jean-pierre; Garcia, Celine; Miossec, Laurence; Saulnier, Denis; Pepin, Jean-francois; Arzul, Isabelle; Omnes, Emmanuelle; Tourbiez, Delphine; Faury, Nicole; Haffner, Philippe; Chollet, Bruno; Robert, Maeva; Cobret, Laetitia; Renault, Tristan; Rauflet, Fabienne; Le Gagneur, Eric; Ropert, Michel; Mouillard, Gilbert; Gerla, Daniel; Annezo, Jean-pierre; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Breerette, Stephane; Chabirand, Jean-michel; Grizon, James; Robert, Stephane; Courtois, Olivier; Rumebe, Myriam.
Créé en 1992, le réseau REPAMO (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s'inscrit dans le cadre de la Directive Européenne 2006/88/CE. Les objectifs du réseau sont de prévenir l'introduction et la propagation d'organismes pathogènes, en particulier ceux à déclaration obligatoire et de surveiller l'évolution de ceux déjà présents sur le territoire national. Ces activités font parties des missions institutionnelles de l'IFREMER. La surveillance assurée par le réseau vise en premier lieu les infections à déclaration obligatoire présentes en France, la bonamiose à Banamia ostreae chez l'huître plate Ostrea edulis et la marteiliose à Marteilia refringens chez...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Etat de santé.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00086/19711/17352.pdf

Observer, Analyser et Gérer la variabilité de la reproduction et du recrutement de l’huître creuse en France : Le Réseau Velyger. Rapport annuel 2012
Provedor de dados: 5
Autores: Pouvreau, Stephane; Bellec, Gwenael; Le Souchu, Pierrick; Queau, Isabelle; Talarmain, Eric; Alunno-bruscia, Marianne; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Fleury, Elodie; Langlade, Aime; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Hitier, Benoist; Bedier, Edouard; Robert, Stephane; Guilpain, Patrice; Grizon, James; Seugnet, Jean-luc; Guesdon, Stephane; Lagarde, Franck; Le Gall, Patrik; Messiaen, Gregory; Roque D'Orbcastel, Emmanuelle; Gohin, Francis; Bryere, Philippe; Quemener, Loic; Repecaud, Michel; Bucas, Karenn; 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, 2012). A Marennes-Oléron, cette variabilité existe, mais s’avère...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00135/24648/22681.pdf

Bilan des « Journées Surmortalité des huîtres creuses, Crassostrea gigas » du Programme P7 « Aquaculture Durable » des 8 et 9 décembre 2009
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2010/acte-7393.pdf

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). II. Response to selection for survival and its influence on growth and yield
Provedor de dados: 5
Autores: Degremont, Lionel; Bedier, Edouard; Boudry, Pierre.
Response to divergent selection for "high" and "low" survival during the summer period, from July to October, was investigated in juvenile (six-month-old) Pacific oysters, Crassostrea gigas, by producing two sets of progenies in 2002 (Generation 2) and three sets of progenies in 2003 (Generation 3). A strict between-family approach was used and resistance of these selected progenies to summer mortality was assessed in three sites along French coasts, to determine their response to selection and estimate realized heritability of the trait. A significant difference in survival was observed between the "high" and "low" selected groups at all sites for all sets of progenies, indicating a significant genetic component. High realized heritabilities for survival...
Tipo: Text
Palavras-chave: Crassostrea gigas; Heritability; Juveniles; Summer mortality; Survival; Growth.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2009/publication-6950.pdf

Performance of Penaeus stylirostris After Six Generations of Selection for Growth
Provedor de dados: 5
Autores: Goyard, Emmanuel; Penet, Laurent; Chim, Liet; Cuzon, Gerard; Bedier, Edouard; Bureau, D.
Tipo: Text
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00174/28479/26819.pdf

Bilan 2013 du réseau Repamo - Réseau national de surveillance de la santé des mollusques marins
Provedor de dados: 5
Autores: Francois, Cyrille; Joly, Jean-pierre; Garcia, Celine; Lupo, Coralie; Travers, Marie-agnes; Tourbiez, Delphine; Chollet, Bruno; Faury, Nicole; Haffner, Philippe; Dubreuil, Christine; Serpin, Delphine; Renault, Tristan; Cordier, Remy; Hebert, Pascale; Le Gagneur, Eric; Parrad, Sophie; Gerla, Daniel; Cheve, Julien; Penot, Julia; Le Gal, Dominique; Lebrun, Luc; Le Gac-abernot, Chantal; Langlade, Aime; Bedier, Edouard; Palvadeau, Hubert; Grizon, James; Chabirand, Jean-michel; Robert, Stephane; Seugnet, Jean-luc; Rumebe, Myriam; Le Gall, Patrick; Bouchoucha, Marc; Baldi, Yoann; Masson, Jean-claude.
Créé en 1992, le réseau Repamo (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s’inscrit dans le cadre de la Directive Européenne 2006/88/CE. Repamo a pour objectif de détecter précocement les infections dues à des organismes pathogènes exotiques et émergents affectant les mollusques marins sauvages et d’élevage.  L’étude des hausses de mortalités a été poursuivie avec 52 interventions complètes ayant conduit au recueil de commémoratifs et à la collecte d’échantillons de mollusques marins pour analyses en pathologie. Des hausses de mortalités d’huîtres creuses (Crassostrea gigas) (44 interventions) ont été recensées dans la majorité des bassins de production de mai à...
Tipo: Text
Palavras-chave: Réseau Surveillance; Pathologie; Mollusques; Coquillages; Santé.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00197/30798/29167.pdf

Effects of age and environment on survival of summer mortality by two selected groups of the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Degremont, Lionel; Boudry, Pierre; Ropert, Michel; Samain, Jean-francois; Bedier, Edouard; Soletchnik, Patrick.
This study investigated the effects of age (first or second summer of life) and environment (three study sites on French coasts) on summer mortality in Crassostrea gigas, using three generations of oysters produced during the Morest project. For each generation, two groups of oysters, selected either as 'resistant' (R) or 'susceptible' (S) to summer mortality at the age of 6 months in Rivière d'Auray (RA, South Brittany), were evaluated. In Ronce (Marennes-Oléron Bay) and RA, R oysters had low mortality during their first and second summers, while mortality was higher during the second summer in Baie des Veys (BDV, Normandy). In RA, S oysters exhibited higher mortality during their first summer than during their second, while the opposite result was found...
Tipo: Text
Palavras-chave: Summer mortality; Age; Environment; Genetic; Crassostrea gigas.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2009/publication-6972.pdf

Genetically based resistance to summer mortality in the Pacific oyster (Crassostrea gigas) and its relationship with physiological, immunological characteristics and infection processes
Provedor de dados: 5
Autores: Samain, Jean-francois; Degremont, Lionel; Soletchnik, Patrick; Haure, Joel; Bedier, Edouard; Ropert, Michel; Moal, Jeanne; Huvet, Arnaud; Bacca, Helene; Van Wormhoudt, A; Delaporte, Maryse; Costil, K; Pouvreau, Stephane; Lambert, Christian; Boulo, Viviane; Soudant, Philippe; Nicolas, Jean-louis; Leroux, Frederique; Renault, Tristan; Gagnaire, Beatrice; Geret, Florence; Boutet, Isabelle; Burgeot, Thierry; Boudry, Pierre.
Summer mortality of Pacific oysters is known in several countries. However no specific pathogen has been systematically associated with this phenomenon. A complex combination of environmental and biological parameters has been suggested as the cause and is now starting to be identified. A high genetic basis was found for survival in oysters when a first generation (G1) was tested in three sites during summer. This paper presents a synthesis on physiological characteristics of two selected groups ('R' and 'S', from families selected for resistance and susceptibility to summer mortality respectively), of the second and third generations. R and S showed improvement or reduction of survival compared with the control in both field and laboratory trials...
Tipo: Text
Palavras-chave: ROS; Temperature; Stress; Hemocytes; Reproduction; Genetic selection; Resistant oyster; Crassostrea gigas; Pacific Oyster; Summer mortality.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2809.pdf

Validation in commercial conditions of the response to selection of the European flat oyster Ostrea edulis for resistance to Bonamia ostreae
Provedor de dados: 5
Autores: Bedier, Edouard; Langlade, Aime; Angeri, Stéphane; Brizard, Raphael; Nerlovic, V.; Glize, Philippe; Haffray, Philippe.
Since the outbreaks of the parasitosis with Marteilia refringens and Bonamia ostreae in the last 60's, the French production of the European flat oyster dropped from 20000 mT to less than 1500 mT currently, leaving the French shellfish farming in situation of virtually monoculture of the Pacific cupped oyster Crassostrea gigas. To sustain this traditional culture, Ifremer has developed, at the experimental level, a genetic selection for a better tolerance to Bonamia ostreae which led to an improvement of survivals. The transfer of these results to the business scale requires the control of the reproduction in hatchery and the adaptation of the cycle of production to the constraints of seedlings in deep water as practised in Brittany (France). That's why a...
Tipo: Text
Palavras-chave: Selection; Genetic; Bonamia ostreae; Parasite; Ostrea edulis; Oyster.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-3313.pdf

Genetical basis of the plasticity of resource allocation in the Pacific oyster (Crassostrea gigas)
Provedor de dados: 5
Autores: Ernande, Bruno; Haure, Joel; Degremont, Lionel; Bedier, Edouard; Boudry, Pierre.
Phenotypic and genetic correlations between fitness-related life-history traits - such as survival, growth and reproductive allocation - have to be considered to better understand selective processes, both in the wild and in breeding programs. Quantitative genetic experiments, based on nested half-sib mating designs, were perfomed in the Pacific oyster C. gigas (1) to estimate genetic variance and the response to selection and (2) to document phenotypic and genetic trade-offs between life history traits. Physiological trade-offs, i.e. plastcity of resource allocation, were shown to vary among genotypes. Genetic polymorphism was primarily observed for the the plasticity of reproductive effort. In addition, the degree of plasticity in reproductive effort...
Tipo: Text
Palavras-chave: Genetic polymorphism; Genetic; Plasticity; Genetical basis; Crassostrea gigas; Pacific oysters.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/acte-3443.pdf

Suivi environnemental de l'estuaire de l'Aber Wrac'h dans le cadre des travaux d'extension du port de Landéda. Deux premières années d'études / juillet 2005 - septembre 2007
Provedor de dados: 5
Autores: Piriou, Jean-yves; Bedier, Edouard.
As part of the extension of the port in Landeda, an environmental monitoring program of the Aber Wrac'h estuary was commissioned by the Spatial Planning Unit of the city of Brest (BMA), the administrative body that oversees port construction. The goal of this programme was to monitor the potential impact of the construction on the nearby marine environment. Surveys were carried out from July 2005 to September 2007 and provided the following results...
Tipo: Text
Palavras-chave: Biométrie; Métaux lourds; HAP; TBT; Echerichia coli; Huîtres.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-4362.pdf

Bilan 2012 du réseau REPAMO - Réseau national de surveillance de la santé des mollusques marins
Provedor de dados: 5
Autores: Francois, Cyrille; Joly, Jean-pierre; Garcia, Celine; Lupo, Coralie; Travers, Marie-agnes; Pepin, Jean-francois; Hatt, Philippe-jacques; Arzul, Isabelle; Omnes, Emmanuelle; Tourbiez, Delphine; Faury, Nicole; Haffner, Philippe; Huchet, Eve; Dubreuil, Christine; Chollet, Bruno; Renault, Tristan; Cordier, Remy; Hebert, Pascale; Le Gagneur, Eric; Parrad, Sophie; Gerla, Daniel; Annezo, Jean-pierre; Terre-terrillon, Aouregan; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Hittier, Benoist; Grizon, James; Chabirand, Jean-michel; Robert, Stephane; Seugnet, Jean-luc; Rumebe, Myriam; Le Gall, Patrik; Bouchoucha, Marc; Baldi, Yoann; Masson, Jean-claude.
Créé en 1992, le réseau Repamo (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s’inscrit dans le cadre de la Directive Européenne 2006/88/CE. Les objectifs du réseau sont de prévenir l’introduction et la propagation d’organismes pathogènes, en particulier ceux à réglementés et de surveiller l’évolution de ceux déjà présents sur le territoire national. Ces activités font partie des missions institutionnelles de l’IFREMER.   L’étude des hausses de mortalités (protocole II) a été poursuivie avec 52 interventions complètes ayant conduit au recueil de commémoratifs et à la réalisation d’échantillons de mollusques marins pour analyses en pathologie. Des hausses de mortalités...
Tipo: Text
Palavras-chave: Réseau; Pathologie; Mollusques; Coquillages; Santé; Surveillance.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00143/25470/23625.pdf

RESCO - REseau d'Observations Conchylicoles : Campagne 2012
Provedor de dados: 5
Autores: Fleury, Elodie; Bedier, Edouard.
Le réseau d’observations conchylicoles RESCO assure, depuis 2009, le suivi de lots sentinelles d'huîtres creuses Crassostrea gigas sur des sites ateliers disposés sur l'ensemble du littoral français. Leur suivi permet d'acquérir des données nationales de croissance et de mortalité, de traduire la dynamique spatio-temporelle des performances d’élevage et ainsi de participer à la compréhension des phénomènes observés. Pour ce faire, des lots sentinelles d’huîtres correspondant à différentes origines (captage ou écloserie, diploïdes ou triploïdes) et à différents stades d’élevage (naissain ou adultes 18 mois) sont déployés simultanément sur 13 sites ateliers représentant les grandes régions conchylicoles du littoral français. En parallèle des suivis de...
Tipo: Text
Palavras-chave: Crassostrea gigas; Huître creuse; Mortalité; Croissance; Température; Enregistrement haute fréquence; Herpes virus; Vibrio aesturianus; Agent pathogène.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00142/25346/23429.pdf

Apport d'un programme de génétique à une filière de production aquacole : l'exemple de l'ostréiculture
Provedor de dados: 5
Autores: Lapegue, Sylvie; Bedier, Edouard; Goyard, Emmanuel; Degremont, Lionel; Baud, Jean-pierre; Gerard, Andre; Goulletquer, Philippe; Boudry, Pierre.
Two oyster species are currently present along the French coasts : the indigenous European flat oyster (Ostrea edulis), and the Pacific cupped oyster (Crassostrea gigas), that has been introduced from Japan since the beginning of the 70ies. The flat oyster successively suffered from two protozoan diseases during the 60ies and its production decreased from 20 000 tons/year by that time to 1 500 tons/year nowadays. Consequently, the oyster production is principally (99%) based upon the Pacific oyster species with approximately 150 000 tons/year among which 90% are grown from the natural spat. However, the hatchery production of this species is developing and was estimated to 400 to 800 millions spat in 2002. Moreover, strengthened relationships between...
Tipo: Text
Palavras-chave: Growth; Selection; Genetic breeding; Genetic; Ostrea edulis; Crassostrea gigas; Oysters; Croissance; Sélection; Amélioration génétique; Génétique; Ostrea edulis; Crassostrea gigas; Huîtres.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2003/acte-3491.pdf

Genetic variation and trade-offs for reproduction ans survival in the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Boudry, Pierre; Degremont, Lionel; Bedier, Edouard; Pouvreau, Stephane; Normand, Julien; Ernande, Bruno.
To date, the most significant method to genetically reduce reproductive effort in the Pacific oyster (Crassostrea gigas) has been through the production of triploids, especially since the development of tetraploid lines allowing the breeding of 'natural' triploids. Gametogenesis of triploid oysters is strongly reduced compared with diploids, although they are not fully sterile and can produce viable gametes and some progenies when crossed with diploids. Reduced reproductive allocation and higher heterozygocity are commonly proposed as the main reasons why triploids often present superior yield compared with diploids. Temperature and food availability are known to favour gametogenesis in triploids, but the existence of genetic variation for this trait...
Tipo: Text
Palavras-chave: Selective breeding; Reproduction; Genetic variation; Crassostrea gigas; Pacific oyster; Genetic.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-3445.pdf

Amylase polymorphism affects growth in the cupped oyster Crassostrea gigas
Provedor de dados: 5
Autores: Huvet, Arnaud; Samain, Jean-francois; Boudry, Pierre; Bedier, Edouard; Ropert, Michel; Van Wormhoudt, A.
The better understanding of physiological and environmental factors that determine optimal food conversion efficiencies is of major interest for the cupped oyster Crassostrea gigas for which the strong increase of aquaculture has been correlated in France with a decrease in productivity due to competition between aquatic species for limited food supplies at grow-out sites. To investigate the non-neutrality of the polymorphism of amylase, a key enzyme for carbohydrate assimilation, in oyster physiology, we report in the present paper the growth and survival measurement of amylase genotypes within five bi-parental C. gigas families, bred to be polymorph at the two PCR-RFLP amylase markers, and reared over one year under standard culture conditions in two...
Tipo: Text
Palavras-chave: Amylase markers; Growth; Amylase Polymorphism; Genetic; Oysters; Crassostrea gigas.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-3311.pdf

Bilan 2008 du réseau REPAMO - Réseau national de surveillance de la santé des mollusques marins
Provedor de dados: 5
Autores: Francois, Cyrille; Garcia, Celine; Arzul, Isabelle; Joly, Jean-pierre; Miossec, Laurence; Chollet, Bruno; Ferrand, Sylvie; Robert, Maeva; Tourbiez, Delphine; Omnes, Emmanuelle; Cobret, Laetitia; Faury, Nicole; Haffner, Philippe; Saulnier, Denis; Pepin, Jean-francois; Renault, Tristan; Antajan, Elvire; Rauflet, Fabienne; Ropert, Michel; Mouillard, Gilbert; Gerla, Daniel; Annezo, Jean-pierre; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Nourry, Max; Chabirand, Jean-michel; Fillon, Alain; Robert, Stephane; Courtois, Olivier.
Créé en 1992, le réseau REPAMO (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s'inscrit dans le cadre de la Directive Européenne 2006/88/CE. Les objectifs du réseau sont de prévenir l'introduction et la propagation d'organismes pathogènes, en particulier ceux à déclaration obligatoire et de surveiller l'évolution de ceux déjà présents sur le territoire national. Ces activités font parties des missions institutionnelles de l'IFREMER. La surveillance assurée par le réseau vise en premier lieu les infections à déclaration obligatoire présentes en France, la bonamiose à Bonamia ostreae chez l'huître plate Ostrea edulis et la marteiliose à Marteilia refringens chez...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Etat de santé.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00086/19709/17351.pdf

Relative importance of family, site, and field placement timing on survival, growth, and yield of hatchery-produced Pacific oyster spat (Crassostrea gigas)
Provedor de dados: 5
Autores: Degremont, Lionel; Bedier, Edouard; Soletchnik, Patrick; Ropert, Michel; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois; Boudry, Pierre.
Summer mortality has been reported in the Pacific oyster, Crassostrea gigas, for many years in different parts of the world. The causes of this phenomenon are complex. The multidisciplinary program "MOREST", coordinated by IFREMER, was initiated to understand the causes of summer mortality of Crassostrea gigas juveniles in France and to reduce its impact on oyster production. Within this program, three successive groups of bi-parental families were bred in a hatchery in 2001 and placed in the field during summer in three sites (Ronce, Riviere d'Auray, and Baie des Veys). This paper reports the relative importance of family, site and field placement timing for three characters of major importance for oyster production: survival, growth, and yield. At the...
Tipo: Text
Palavras-chave: Juvenile; Crassostrea gigas; Oysters; Yield; Growth; Survival.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1693.pdf

Bilan 2010 du réseau Repamo - Réseau national de surveillance de la santé des mollusques marins
Provedor de dados: 5
Autores: Guichard, Benjamin; Francois, Cyrille; Joly, Jean-pierre; Garcia, Celine; Saulnier, Denis; Pepin, Jean-francois; Arzul, Isabelle; Omnes, Emmanuelle; Tourbiez, Delphine; Faury, Nicole; Haffner, Philippe; Chollet, Bruno; Robert, Maeva; Renault, Tristan; Rauflet, Fabienne; Le Gagneur, Eric; Ropert, Michel; Mouillard, Gilbert; Gerla, Daniel; Annezo, Jean-pierre; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Brerette, Stéphane; Chabirand, Jean-michel; Grizon, James; Robert, Stephane; Courtois, Olivier; Rumebe, Myriam; Cantin, Christian.
Créé en 1992, le réseau REPAMO (REseau de PAthologie des MOllusques) est un réseau de surveillance de la santé des mollusques marins du littoral français. Son activité s’inscrit dans le cadre de la Directive Européenne 2006/88/CE. Les objectifs du réseau sont de prévenir l’introduction et la propagation d’organismes pathogènes, en particulier ceux à déclaration obligatoire et de surveiller l’évolution de ceux déjà présents sur le territoire national. Ces activités font parties des missions institutionnelles de l’IFREMER. La surveillance assurée par le réseau vise en premier lieu les infections à déclaration obligatoire présentes en France, la bonamiose à Bonamia ostreae chez l’huître plate Ostrea edulis et la marteiliose à Marteilia refringens chez...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Santé; Surveillance.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00059/17050/14599.pdf

Observer, Analyser et Gérer la variabilité de la reproduction et du recrutement de l’huître creuse en France : Le Réseau Velyger. Rapport annuel 2013
Provedor de dados: 5
Autores: Pouvreau, Stephane; Petton, Sebastien; Queau, Isabelle; Bellec, Gwenael; Talarmain, Eric; Le Souchu, Pierrick; Alunno-bruscia, Marianne; Auby, Isabelle; Maurer, Daniele; D'Amico, Florence; Passoni, Sarah; Barbier, Claire; Tournaire, Marie-pierre; Rigouin, Loic; Rumebe, Myriam; Fleury, Elodie; Langlade, Aime; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Palvadeau, Hubert; Bedier, Edouard; Robert, Stephane; Pepin, Jean-francois; Grizon, James; Seugnet, Jean-luc; Chabirand, Jean-michel; Le Moine, Olivier; Guesdon, Stephane; Lagarde, Franck; Mortreux, Serge; Le Gall, Patrik; Messiaen, Gregory; Roque D'Orbcastel, Emmanuelle; Quemener, Loic; Repecaud, Michel; Bucas, Karenn; 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, 2012, 2013). A Marennes-Oléron, cette variabilité existe, mais...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00200/31091/29499.pdf

Bilan 2005 du réseau REPAMO - Réseau national de surveillance zoosanitaire des mollusques marins
Provedor de dados: 5
Autores: Garcia, Celine; Arzul, Isabelle; Chollet, Bruno; Ferrand, Sylvie; Francois, Cyrille; 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; Chabirand, Jean-michel; Fillon, Alain; Robert, Stephane; Courtois, Olivier; D'Amico, Florence; Rumebe, Myriam; Pichot, Yves; Le Gall, Patrik.
Created in 1992, the REPAMO network (Network of mollusc pathology), is a national zoosanitary surveillance network of shellfish health status along the French coasts. Ils activities are in keeping with two European Directives, 91167/EEC and 95170/EC and are a part of the institutional tasks of Ifremer. The aims of the network are to prevent the introduction and spread of exotic pathogens and to sm'vey 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 (Granville bed and zone X). In 2005, only samples of the Granville bed could be analysed due to the difflculty to obtain flat oysters (sparse oyster beds, beds...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Etat de santé; Network; Surveillance; Pathology; Molluscs; Shellfish; Health status.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00086/19704/17346.pdf

Etude comparative en cytométrie en flux des fonctions estérases et du métabolisme oxydatif d'hémocytes d'huîtres saines, parasitées, sensibles et résistantes au protozoaire Bonamia ostrea
Provedor de dados: 5
Autores: Cochennec, Nathalie; Garcia, Sandrine; Bedier, Edouard.
In order to fight Bonamiosis, the applicable means are very limited and mostly based on a quick and precocious diagnostic aimed at avoiding the propagation of the disease and a rise in the "resistance" through genetic selection. Various works are conducted in order to understand the oysters' defence mechanisms against this parasite, and then to develop new prophylaxis and fighting methods. In our laboratory, we focus on cellular compartments, the circulating haemocytes, in which B. ostreae multiplies, and their interaction with the parasite.
Tipo: Text
Palavras-chave: Protozoaire; Huître; Hémocytes; Cytométrie en flux; Bonamia ostreae; Biologie cellulaire.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/acte-3275.pdf

Nutrition and reproduction are key parameters in the interaction process leading to Crassostrea gigas oyster summer mortality in France
Provedor de dados: 5
Autores: Samain, Jean-francois; Degremont, Lionel; Soletchnik, Patrick; Ropert, Michel; Bedier, Edouard; Mazurie, Joseph; Mazurie, Joseph; Martin, Jean-louis; Moal, Jeanne; Mathieu, Michel; Pouvreau, Stephane; Lambert, Christophe; Escoubas, Jean-michel; Nicolas, Jean-louis; Le Roux, Frédérique; Renault, Tristan; Burgeot, Thierry; Bacher, Cedric; Boudry, Pierre.
Complex interactions between oyster, environment and pathogens were observed during the MOREST (2001-2005) project on summer mortality events of Crassostrea gigas oysters in France. The talk will show how nutrition level increasing reproductive intensity generates a risk for pathogen infection under synergistic effect of temperature and stress. Moreover, a genetic component is associated to specific reproductive performances and spawning behaviour. To better understand origin of such resistance or susceptibility to summer mortality, other characteristics as stress susceptibility, energy management and hemocyte activities of oysters from the two phenotypes were compared. This first comparison suggests interactions between stress, reproduction and defence...
Tipo: Text
Palavras-chave: Genetic; Pathologie; Mortality; Crassostrea gigas; Pacific oyster; Reproduction; Nutrition; Physilogy.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/2006/acte-3467.pdf

Le risque sédimentaire
Provedor de dados: 5
Autores: Bedier, Edouard; Fleury, Pierre-gildas; Langlade, Aime; Haure, Joel; Le Roux, A.; Ropert, Michel; Rauflet, Fabienne; Soletchnik, Patrick.
The "sedimentary risk" has been identified since the mid-nineties in the Marennes Oléron Bay. The proximity of the sediment (from 0 to 15cms) increases the mortality rate. Depending on the year, mortality can be 10 to 20 % higher than in "high" conditions (50 to 70cms). These zootechnic results, gathered since 1996 on the working site of Ronces – Perquis, lead to the research of a pathogenic agent or a toxic substance released by the sediment. Studies conducted between 2002 and 2003 [12, 18] did not allow the identification of any pathogenic agents and ruled out the infectious risk. In 2004, the chemical risk (sulphides, ammoniacal nitrogen) was studied on 4 sites (3 working sites + Quiberon). In 2004, the "on-bottom/off bottom" mortality model of the...
Tipo: Text
Palavras-chave: MOREST; Hydrologie; Zootechnie; Sédimentologie; Mortalités; Crassostrea gigas; Huîtres.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-3411.pdf

An amylase gene polymorphism is associated with growth differences in the Pacific cupped oyster Crassostrea gigas
Provedor de dados: 5
Autores: 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

Ressources génétiques chez l'huître creuse Crassostrea gigas : variabilité, différenciation et adaptation aux conditions de production en Charente Maritime
Provedor de dados: 5
Autores: Huvet, Arnaud; Boudry, Pierre; Baud, Jean-pierre; Nourry, Max; Phelipot, Pascal; Gerard, Andre; Ledu, Christophe; Heurtebise, Serge; Cornette, Florence; Blouin, Frederic; Bedier, Edouard; Lapegue, Sylvie.
es marqueurs génétiques, particulièrement bien adaptés à ces problématiques car hypervariables, ont été mis au point récemment dans notre laboratoire en collaboration avec le laboratoire Génome et Populations de Montpellier (CNRS). Ils permettent désormais l'analyse approfondie et la discrimination fine de populations d'huîtres creuses Crassostrea gigas et de rechercher si certaines d'entre-elles n'auraient pas des caractéristiques intéressantes pour l'ostréiculture locale (croissance, résistance estivale, affinage ... ). La diffusion de telles populations auprès de la profession serait plus rapide car il s'agit de la même espèce. Selon les recommandations du CIEM, il faut effectuer une mise en quarantaine des huîtres importées (après contrôles sanitaires)...
Tipo: Text
Palavras-chave: Génétique; Génétique des populations; Marqueurs génétiques; Microsatellite; Huître creuse; Crassostrea gigas.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00044/15563/12952.pdf

Bilan 2003 du réseau REPAMO - Réseau national de surveillance zoosanitaire des mollusques marins
Provedor de dados: 5
Autores: Arzul, Isabelle; Garcia, Celine; Joly, Jean-pierre; Miossec, Laurence; Chollet, Bruno; Robert, Maeva; Cuvelier, Nicolas; Lefebvre, Alain; Le Gagneur, Eric; Kopp, Joel; Mouillard, Gilbert; Gerla, Daniel; Le Saux, Jean-claude; Raguenes, Pierre; Le Gal, Dominique; Langlade, Aime; Bedier, Edouard; Nourry, Max; Martin, Jean-louis; Fillon, Alain.
The REPAMO network (network ofmollusc pathology), created in 1986, ensures the survey of shellfish health status along French coasts according? to European Directives 91/67/EEC and 95/70/EEC. The aims of the network are 1 - to prevent the introduction and spread of exotic pathogens, 2-to study the means to decrease the impact of pathogens already present and to survey their evolution. In 2003, the REPAMO network focused on the survey oflisted diseases (bonamiosis and marteiliosis) in two areas under agreement process (Banc de Granville and zone X) and on the study of abnormal morlalities. Number of reported abnormal morlalities has increased in 2003. This rise can be partly explained by the recent network restructuring, but also by the summer heatwave and...
Tipo: Text
Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Etat de santé; Network; Surveillance; Pathology; Molluscs; Shellfish; Health status.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00086/19699/17340.pdf

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). I. Estimation of genetic parameters for survival and growth
Provedor de dados: 5
Autores: Degremont, Lionel; Ernande, Bruno; Bedier, Edouard; Boudry, Pierre.
The multidisciplinary project "MOREST" aims to improve our understanding of causes of summer mortality in Crassostrea gigas juveniles in France and to reduce its impact on oyster production. As pail of the MOREST project, 43 full-sib families nested within 17 half-sib families were produced, planted out and tested in 3 sites during summer 2001 to assess to what extent genetic variability exists for this trait. A strong genetic basis was found for survival as narrow-sense heritability estimates ranged from 0.47 to 1.08, with higher values in sites where summer mortality was higher. Genetic correlations across sites were positive and very high for survival, indicating no genotype by environment interaction. In contrast, lower genetic variation was observed...
Tipo: Text
Palavras-chave: Growth; Survival; Juveniles; Heritability; Crassostrea gigas.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2457.pdf

Microsatellite-associated heterosis in hatchery-propagated stocks of the shrimp Penaeus stylirostris
Provedor de dados: 5
Autores: Bierne, Nicolas; Bezuart, Ivan; Vonau, Vincent; Bonhomme, François; Bedier, Edouard.
Correlation between DNA microsatellite heterozygosity and growth rate was investigated in two hatchery-propagated stocks of the shrimp Penaeus stylirostris, which had been genetically isolated from wild founders for 17 generations, and from each other for five more generations. presumed demographic history of these populations suggested that they were maintained at small effective population sizes. and this was confirmed by significant changes in allelic frequencies between the two stocks. Despite a small sample size (n = 60) and a small number of loci screened, a significant positive correlation was detected between microsatellite tri-locus heterozygosity and growth rate in one of the two stocks (r = 0.3, P = 0.02). In the other stock (n = 48), the...
Tipo: Text
Palavras-chave: Penaeus stylirostris; Heterozygosity; Marker associated heterosis; Inbreeding depression; Microsatellites.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-753.pdf

Response to divergent selection for resistance to summer mortality in Pacific oyster spat : genetic parameters and correlated responses with subsequent survival and growth
Provedor de dados: 5
Autores: Boudry, Pierre; Bedier, Edouard; Ernande, Bruno; Degremont, Lionel.
The multidisciplinary program "MOREST" aims to improve our understanding of causes of summer mortality in Crassostrea gigas juveniles in France and to reduce its impact on oyster production. As part of this program, four successive generations of families were bred between 2001 and 2005 in our research hatchery in La Tremblade. Survival and growth were recorded in the field in three sites along the French coast (Ronce, Rivière d'Auray and Baie des Veys). The first generation (44 full-sib families nested within 17 half-sib families) was tested during summer 2001 to assess to what extent genetic variability exists for spat survival.  An important genetic basis was found (estimated narrow-sense heritability among sites = 0.83 ± 0.40). In contrast, lower...
Tipo: Text
Palavras-chave: Survival; Growth; Genetic parameters; Summer mortality; Selection; Genetic; Crassostrea gigas; Pacific oysters.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-3458.pdf

L'amélioration des performances de l'huître plate européenne Ostrea edulis par la sélection génétique
Provedor de dados: 5
Autores: Bedier, Edouard; Baud, Jean-pierre; Cochennec, Nathalie; Cornette, Florence; Gerard, Andre; Goyard, Emmanuel; Joly, Jean-pierre; Kopp, Joel; Langlade, Aime; Le Coguic, Yvette; Mazurie, Joseph; Nourry, Max.
The European flat oyster Ostrea edulis has been considered as the traditional French oyster for a very long time and has now nearly disappeared from our farms, as a consequence of the two successive epizootic of the Marteilia refringens parasite and Bonamia ostreae. The actual quasi monoculture of Crassostrea gigas has made necessary the search for a diversification in oyster culture, including the search for a new start of the indigenous flat oyster culture. The Ifremer has been conducting parallel works since 1985 in order to better understand the biology of the parasite as well as to try and select different lines of flat oyster resistant to Bonamia ostreae.
Tipo: Text
Palavras-chave: Bonamia ostrea; Huître plate; Sélection Génétique; Ostrea edulis.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/acte-3274.pdf

Les pratiques culturales peuvent-elles permettre de réduire la surmortalité du naissain d'huîtres creuses? Récapitulatif des essais d'élevage et expérimentations zootechniques menés sur le territoire français entre 2008 et 2010
Provedor de dados: 5
Autores: Soletchnik, Patrick; Mazurie, Joseph; Allain, Gwenhael; Bedier, Edouard; Benabdelmouna, Abdellah; Blin, Jean-louis; Bouquet, Anne-lise; Cochet, Hélène; Degremont, Lionel; Gaussem, Florian; Gervasoni, Erika; Glize, Philippe; Petton, Bruno; Roussel, Pierre-yves; Pernet, Fabrice.
This paper summarizes knowledge about relations between husbandry practices and oyster spat mortalities since 2008 in France. These relations are strictly analyzed from a panel of experiments set on the shore (in outdoor experiments) by Ifremer teams and technical institutes all over French coasts. Results show some practices are able to reduce spat mortality with some influencing factors relevant of spat quality (sanitary status, natural or genetic selection) or husbandry practices. Spat “free” of virus is able to survive up to 90% when it is isolated and confined in ponds or nursery, during an epidemic crisis. When outbreaks occurred in oyster beds, natural or nursery spat died in almost same proportions. In 2010, some studies conducted in Mediterranean...
Tipo: Text
Palavras-chave: Surmortalité; Naissain; Huître creuse; OsHV-1; Pratiques culturales; Mortality; Spat; Cupped oyster; Crassostrea gigas; OsHV-1; Cultural practices.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00032/14280/25847.pdf

Impact du sédiment sur les mortalités estivales de naissain d'huîtres creuses Crassostrea gigas en baie de Quiberon
Provedor de dados: 5
Autores: Bedier, Edouard; Knoery, Joel Radford; Fleury, Pierre-gildas; Quiniou, Francoise; Langlade, Aime; Cozic, Amandine; Delesmont, Edith; Delesmont, Régis; Caisey, Xavier; Lecureuil, Laetitia.
The phenomenon of summer mortalities of the Pacific cupped oyster Crassostrea gigas is observed in France since the beginning of the 90's. These mortalities are classically associated to younger stages and summer temperatures and occur during the reproduction period of the animal. The studies undertaken during the project Morest (2001-2005), showed that a number of biological and environmental risks, the interaction of them induces lethal stresses for animals in physiological weakness, exists in summer. Among these risks, that which is withstood by the oysters bred close to the sediment proved to be significant in intertidal areas. In Quiberon bay (southern Brittany, France), the breeding practices of sowing oysters in deep water is thus likely to expose...
Tipo: Text
Palavras-chave: Huître; Crassostrea gigas; Mortalité; Sédiment; Composé réduit; Flux; Sulfure; Ammonium; Oyster; Crassostrea gigas; Mortality; Sediment; Reduced compound; Flux; Sulphide; Ammonia.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00108/21956/19550.pdf