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Registros recuperados: 30
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Testage de souches d'huîtres plates Ostrea edulis tolérantes à Bonamia ostreae: élevage contrôlé, écophysiologie et modélisation de la croissance ArchiMer
Haure, Joel.
Since the 1960's, breeding of the flat oyster Ostrea edulis has been under threat from two protozoan parasites, one of which is Bonamia ostrea. Several attempts have been made to introduce flat oysters of the Ostrea genus on the French coast, without much success. The IFREMER genetics laboratory. at Ronce les Bains has used selective pressure with Bonamia ostrea to obtain bonamiosis-resistant strains of the flat oyster, Ostrea edulis. The growth and physiology of these animaIs was studied in an intensive breeding system in which the algae Skeletonema costatum was used as fodder. The growth performance of the tolerant animals was compared with that of non-selected controls over a period of three years (1994,1995,1996). An analysis of the results showed the...
Tipo: Text Palavras-chave: Ostrea edulis; Skeletonema costatum; Ecophysiologie; Modélisation; Elevage intensif; Bonamia ostreae; Ostrea edulis; Skeletonema costatum; Ecophysiology; Modelisation; Intensive culture; Bonamia ostreae.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00108/21961/19555.pdf
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Observations des éléments structuraux intervenant dans les mécanismes de nutrition préingestifs chez l'huître japonaise Crassostrea gigas ArchiMer
Barille, Laurent.
Recent feeding-physiology experiments have shown that the Japanese oyster Crassostrea gigas was able to operate a selection among inorganic and organic particles before ingestion. However, the underlying mechanisms are not well understood. Anatomical observations of different structures which may play a raie in the selection processes are brought together and submitted to the actual knowledge on bivalve feeding. The mantle lobes, the ciliary structure of the ordinary filaments, the marginal ventral groove and the labial palps are described.
Tipo: Text Palavras-chave: Nutrition; Crassostrea gigas; Huîtres; Ecophysiologie.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-3077.pdf
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Journées Conchylicoles IFREMER Centre de Nantes 3 et 4 avril 2001 ArchiMer
Goulletquer, Philippe; Le Moine, Olivier; Rivet, Florence; Conche, Nelly; Dupuy, Beatrice.
Les journées conchylicoles sont organisées tous les 2 ans par le Département RA afin d'effectuer un point sur l'avancement des travaux de recherche. Elles se veulent être un lieu de discussion et d'échanges entre les différents laboratoires et doivent permettre des présentations orales, y compris par les techniciens de ces laboratoires. C'est une des seules occasions de lieu d'information directe, et de regroupement de l'ensemble des acteurs de ces programmes pendant 2 journées. Lors des journées organisées en 1999, la participation des structures régionales et départementales de transfert avait déjà permis un transfert d'information des résultats IFREMER vers celles-ci. En plus de leur participation, une présentation orale de leurs activités respectives a...
Tipo: Text Palavras-chave: Réseau Surveillance; Virologie; Ecophysiologie; Immunologie; Physiologie; Système de production; Bactériologie; Génétique.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00200/31116/29527.pdf
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Journées conchylicoles 1997 Ifremer Nantes les 18 et 19 mars 1997 ArchiMer
IFREMER.
Ce rapport synthétise les communications faites lors des "Journées conchylicoles", sur les travaux scientifiques de l'Ifremer en soutien aux activités conchylicoles
Tipo: Text Palavras-chave: Immunité; Ecloserie; Génétique; Pathologie; Ecophysiologie; Système d'élevage; Claires ostréicoles.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00200/31113/29524.pdf
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Ecophysiologie de coquillages contaminés par des microalgues toxiques : premiers essais ArchiMer
Rohmer, Véronique.
Afin d'évaluer les effets d'une contamination expérimentale par des microalgues toxiques sur la filtration,· des bivalves (Pecten maximus, Crassostrea gigas et Mytilus edulis) ont été alimentés pendant quelques heures avec différents régimes : des cultures très toxiques (Alexandrium tamarense, souche japonaise), moyennement toxique (A. minutum, souche française) et non toxique (A. tamarense, souche anglaise) de dinoflagellés, et une culture non toxique témoin d'une chlorophycée : Tetraselmis suesica. Les différents essais réalisés montrent que l'utilisation de rouge neutre ne permet pas de comparer les activités valvaires dans les conditions expérimentales. L'enregistrement direct de l'activité valvaire est intéressant mais difficilement reproductible dans...
Tipo: Text Palavras-chave: Pecten maximus; Mytilus edulis; Crassostrea gigas; Ecophysiologie; Microalgues toxiques; Paralytic Shellfish Poison.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00429/54043/55314.pdf
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Les besoins écophysiologiques des larves d'huitres creuse Crassostrea gigas en conditions contrôlees : effet de la température, de la nourriture et modélisation de la croissance ArchiMer
Rico Villa, Benjamin.
Nowadays, spat production of Pacific oyster Crassostrea gigas relies on rearing techniques under controlled conditions in hatchery. In this context, an extensive research in aquaculture is necessary because larval development and metamorphosis are critical for hatchery management. Firstly, a diet consisted in a Haptophyceae: Isochrysis affinis galbana (clone T-ISO) and a Bacillariophyceae: Chaetoceros calcitrans forma pumilum demonstrated its efficiency to supply the nutritional needs throughout the whole larval rearing. Then, a flow-through rearing system was developed and coupled with a continuous hydrobiological data recorder to provide basic information for ecophysiology research through different trophic levels and/or temperature throughout larval...
Tipo: Text Palavras-chave: Crassostrea gigas; Larve; Huître; Croissance; Ecophysiologie; Microalgues; Température; Système d’élevage; Modélisation; Crassostrea gigas; Larvae; Oyster; Growth; Ecophysiology; Microalgae; Temperature; Rearing System; Modelling.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00012/12308/9102.pdf
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Eléments d'écophysiologie d'huîtres Crassostrea gigas issues du bassin de Marennes-Oléron ArchiMer
Goulletquer, Philippe; Lagarde, Franck.
Le bassin de Marennes-Oléron est le premier site ostréicole européen. Depuis 1988 des mortalités chroniques apparaissent sur les élevages conchylicoles. En 1996, un programme de suivi de mortalité et des paramètres environnementaux a été développé. Les différentes conclusions retenues au cours des années antérieures font état de brusques variations de température suspectées dans l'apparition de ces mortalités. Une approche écophysiologique des huîtres par l'intermédiaire de la mesure de respiration a permis de déterminer l'effet significatif d'un stress thermique (∆T=28°C). La maturité sexuelle apparaît également comme un facteur prépondérant dans la demande métabolique. A l'issue de cette étude, il apparaît que les huîtres matures et de surcroît stressées...
Tipo: Text Palavras-chave: Ecophysiologie; Physiologie; Huître creuse; Bassin de Marennes-Oléron.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00076/18761/16332.pdf
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Summer mortality of the Pacific cupped oyster Crassostrea gigas in the Bay of Marennes-Oleron (France) ArchiMer
Goulletquer, Philippe; Soletchnik, Patrick; Le Moine, Olivier; Razet, Daniel; Geairon, Philippe; Faury, Nicole.
A comprehensive research program has been developed since 1995 to focus on C. gigas abnormal mortality rates occurring regularly during the summer period in the Bay of Marennes Oleron (France). Several subprojects were carried out including in-vitro ecophysiological studies to asses l) the relationship between reproductive status, scope for growth and mortality, 2) effects of stress temperature on physiological functions. Meanwhile, field studies concerned monitoring surveys of calibrated oyster populations at various emersion time and geographic sites. A database was developed and incorporated into a geographic information system (GIS) to overlay several layers of information and establish relationship among environmental parameters and mortality rates....
Tipo: Text Palavras-chave: Marennes Oleron bay; In situ continuous monitoring; Ecophysiology; Stress; Environmental conditions; Summer mortality; Crassostrea gigas; Marennes Oléron; In situ en continu; Suivis environnementaux; Ecophysiologie; Stress; Conditions environnementales; Mortalité estivale; Crassostrea gigas.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/acte-3093.pdf
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Modélisation de l'affinage de l'huître Crassostrea gigas alimentée avec la diatomée Skeletonema costatum ArchiMer
Meleder, Vona; Barille-boyer, Anne-laure; Baud, Jean-pierre; Barille, Laurent; Cognie, Bruno; Rosa, Philippe.
The traditional fattening of the oyster Crassostrea gigas in oyster ponds of the French Atlantic Coast is submitted to natural environmental fluctuations. In order to reduce the growth variability of the soft parts of the bivalve, an intensive fattening process was developed, where the conditions of temperature, particulate organic and inorganic matter (POM and PIM) are controlled. This process relies on the production of the diatom Skeletonema costatum, which is then distributed to the oysters at an average concentration of 4–5 mg POM·L–1. An ecophysiological model of the oyster C. gigas, which simulates the evolution of somatic and gonad–reserve compartments, was applied to these conditions in order to analyse the bivalve responses. Experimentation was...
Tipo: Text Palavras-chave: Modélisation; Affinage; Ecophysiologie; Crassostrea gigas; Skeletonema costatum; Modelling; Oyster fattening; Ecophysiology; Crassostrea gigas; Skeletonema costatum.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00021/13248/10285.pdf
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Etude comparative des caractéristiques écophysiologiques et des performances de croissance de l'huître creuse Crassostrea gigas diploïde et triploïde en milieu contrôlé ArchiMer
Haure, Joel; Fortin, Adeline; Dupuy, Beatrice; Nourry, Max; Palvadeau, Hubert; Papin, Mathias; Penisson, Christian; Martin, Jean-louis.
Introduction: Marine farming in France is currently very widely dominated by oyster farming. French oyster production totals 148,467 tons, for a turnover of close to 280 million euros, making France the leading European producer. The two main species concerned are the cup oyster, Crassostrea gigas (140,000 tons) and the flat oyster, Ostrea edulis (2,000 tons), the production of which has collapsed since 1970 following successive epizootics of Marteilia refringens and Bonamia ostreae. French oyster farming is thus in a situation of quasi single-crop farming, with more than 90% of tonnage pertaining to the cup oyster (FAO data from 1993). This situation of quasi single-crop farming leads to the pessimistic observation that one hypothetical crisis in the...
Tipo: Text Palavras-chave: Growth; Ecophysiology; Oyster; Crassostrea Gigas; Eeproduction; Milieu Controle; Croissance; Triploide; Diploide; Ostreidae; Huitre; Crassostrea Gigas; Ecophysiologie; Reproduction.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-1509.pdf
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Journées Conchylicoles IFREMER Centre de Nantes 12 et 13 mars 2003 ArchiMer
Prou, Jean; Conche, Nelly; Taillade, Sylvie.
Ce rapport synthétise les communications faites lors des "journées conchylicoles" sur les travaux scientifiques de l'Ifremer en soutien aux activités conchylicoles
Tipo: Text Palavras-chave: Génétique; Immunologie; Pathologie; Physiologie; Ecophysiologie; Système d'élevage.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00200/31115/29526.pdf
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Optimisation des conditions hydrobiologiques pour la conservation de l'huître creuse Crassostrea gigas en système re-circulé ArchiMer
Buzin, Florence.
The maintenance of bivalve commercialisation du ring periods when sales are prohibited represents a major economic issue for shellfish-farming. To ensure their survival and to preserve the oyster Crassostrea gigas quality, their storage in land-based systems has been studied i) out of water in a cold room at 3°C with controlled humidity, enabling the bivalve sensory quality to be retained for 15 days, and ii) in recirculating systems in immersed conditions for 30 days. For the latter, the oysters were stored at 167 kg.m3 density in a tank equipped with an air-lift system, with water treated with UV and thermoregulated. A minimum of food was supplied to avoid mass tissue loss. A temperature of 16°C was defined as optimal to limit mortality and to avoid...
Tipo: Text Palavras-chave: Crassostrea gigas; Huître Pacifique; Système re-circulé; Ecophysiologie; Sauvegarde; Modélisation; Crassostrea gigas; Pacific oyster; Recirculating system; Ecophysiology; Safeguard; Modelling.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00092/20350/17995.pdf
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Modélisation de la dynamique du microphytobenthos des vasières intertidales du bassin de Marennes-Oléron. Effets des synchroniseurs physiques sur la régulation de la production ArchiMer
Guarini, Jean-marc.
The study aimed at quantifying the spatio-temporal evolution of microphytobenthic biomass in intertidal mudflats of Marennes-Oléron Bay. To reach this goal, a dynamic model has been proposed, including processes of primary production, active migration of epipelic diatoms and biomass lasses due to mortalities on one hand and resuspension in the water column during submersion on the other hand. The spatialisation is given by a hydrodynamic madel which calculates the water height everywhere. The photic environment of microphytobenthos is described in a discrete way, by means of two layers: the biofilm of epipelic algae « S »on the top of the sediment and the fust centimeter of the mud « F ». The endogenous vertical migration rhythm of epipelic algae controls...
Tipo: Text Palavras-chave: Microphytobenthos; Vasière intetidale; Modélisation; Dynamique de la biomasse; Expérimentation; Ecophysiologie; Couplage physique/biologie; Microphytobenthos; Intertidal mudflat; Modelling; Dynamics of the biomass; Experimentation; Ecophysiology; Physics/biology coupling.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00439/55029/56462.pdf
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Feeding responses of Crassostrea gigas (Thunberg) to inclusion of different proportions of toxic dinoflagellates in their diet ArchiMer
Bardouil, Michele; Bohec, Madeleine; Bougrier, Serge; Lassus, Patrick; Truquet, Philippe.
An experimental flow-through system allowing determination of the feeding behaviour of individual molluscs was used to study oysters exposed to mixed diets composed of varying proportions of the diatom Thalassiosira weissflogii and two strains (toxic and nontoxic) of the dinoflagellate Alexandrium larnarense. Our results show that, when compared to a T. weissflogii unialgal diet, even a diatomltoxic dinoflagellate ratio as low in biomass as 90/10 reduced clearance rates and biodeposit production by oysters. Consumption was slightly but significantly decreased for a 50/50 diatomltoxic dinoflagellate mixture. For the toxic dinoflagellate unialgal diet, ingestion, absorption and consumption were completely inhibited. Thus, the inclusion of low amounts of...
Tipo: Text Palavras-chave: Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiologie; Toxine paralysante des coquillages; Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiology; Paralytic shellfish poison.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00017/12788/9729.pdf
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Impact de la pollution aux hydrocarbures sur l'écophysiologie et la pathologie des bivalves d'intérêt commercial de la Côte Atlantique ArchiMer
Martin, Jean-louis; Haure, Joel; Thebault, Anne; Goulletquer, Philippe.
The evaluation of the ecological and economical consequences of the hydrocarbon pollution of the Erika implies the setting up of monitorings, analysis and experiments in the short, medium and long term. Among the consequences to be evaluated, a great deal of attention has to be paid to the direct impact on the biology and production performances of the main shellfish species as about 30% of the national production (around 130,000 tons of oysters and 60,000 tons of mussels per year) is cultivated in the impacted area. The main difficulty in evaluating the effects of the contaminants on a distinct part of the ecosystem which is mostly dominated by a cultured population dwells in the different approaches to set up as well as the variability of the answers...
Tipo: Text Palavras-chave: Pathologie; Ecophysiologie; Conchyliculture; Impact; Hydrocarbures; Pollution.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3308.pdf
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Les facteurs écophysiologiques et génétiques ainsi que la ploïdie influencent-ils la réponse de l'huître creuse, Crassostrea gigas, à une infection par des Vibrio ? ArchiMer
Castagnet, Sophie.
Depuis une quinzaine d'années, des mortalités massives d'huîtres creuses Crassostrea gigas, sont observées sur le littoral français durant la période estivale. Des études ont démontré que les mortalités sont plurifactorielles et qu'elles sont la résultante d'interactions entre l'environnement, l'huître (physiologie et génétique) et certains agents infectieux. Durant ce stage, les interactions entre l'huître creuse et deux bactéries de genre Vibrio (Vibrio splendidus et Vibrio aestuarianus), fréquemment associées aux mortalités, ont été étudiées, afin de tenter de comprendre le lien entre les facteurs de l'hôte (origine génétique et physiologie de la reproduction) et les vibrions (production d'un facteur de virulence), pouvant impacter la sensibilité de...
Tipo: Text Palavras-chave: Ecophysiologie; Génétique; Huître creuse; Crassostrea gigas; Vibrio splendidus; Vibrio aestuarianus; Microbiologie.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00033/14442/11741.pdf
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L'adaptation ecophysiologique et sanitaire de l'ecrevisse turque Astacus leptodactylus a des milieux saumatres: Contribution a l'astaciculture ArchiMer
Barbe, D; Lautier, J; Vernet, G; Vey, A.
This influence of salt media on different aspects of biological cycle and on most common pathogenic agents of Turkish freshwater crayfish Astacus leptodactylus is investigated survival and growing of juveniles O super(+) and intermediary individuals 1 super(+) are also studied. Total osmotic metabolism and reproduction, have been recorded. It appears that youngest individuals are particularly sensitive to low salinities (7 ppt.). Intermediary ones are more resistant nevertheless salinity does not improve neither survival nor growing. Copulation, laying and pleopod egg fixation are particularly affected by salt waters. The only promising application of salinity parameter on astaciculture could be whether prophylactic or curative treatment with concentrated...
Tipo: Text Palavras-chave: Astacus leptodactylus; Malacostraca; Infectious diseases; Sexual reproduction; Growth; Mortality; Survival; Osmotic adaptations; Crayfish culture; Pathology; Metabolism; Salinity; Ecophysiology; Astaciculture; Régulation osmotique; Reproduction; Survie; Croissance; Pathologie; Ecophysiologie; Salinité; Astacus leptodactylus; Ecrevisse.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-1185.pdf
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Efflorescences toxiques des eaux côtières françaises. Ecologie, écophysiologie, toxicologie ArchiMer
Berland, Brigitte; Lassus, Patrick.
Tandis que certa ines efflorescences micro-algales provoquent de sérieuses nuisances par leur développement exubérant, d'autres sont nocives en raison des toxines qu'elles produisent. Ces proliférations,  dangereuses pour les organismes marins, mais aussi pour les consommateurs de fruits de mer, sont étudiées en France depuis 1983. Dès 1989, devant l'ampleur des phénomènes observés au niveau national et européen, un programme scientifique réunissant de nombreux in stituts et laboratoires, le PNEAT, a été créé afin de fédérer les moyens mis en oeuvre dans des disci plines aussi diverses que l'écologie, la biologie cellulaire, l'écophysiologie, la toxicologie et la chimie. Les résultats obtenus au cours de la période 1989-1995 sont présentés à la fois pour...
Tipo: Text Palavras-chave: Efflorescences; Cycle biologique; Allélopathie; Taxonomie; Ecophysiologie; Broutage; Phycotoxines; Toxicologie; Chimie extractive; Toxinogenèse; Bioaccumulation.
Ano: 1997 URL: https://archimer.ifremer.fr/doc/00450/56179/57726.pdf
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Modélisation écologique des populations de palourdes roses (Paphia rhomboïdes) et d'amandes de mer (Glycymeris glycymeris) en Manche ArchiMer
Savina, Marie.
Diversity and abundance of the benthic fauna in the Channel Sea have favoured the development of fisheries, particularly those of shellfish (scallop, warty venus, common cockle, dog cockle, banded carpet shell, surf clam...) and also attracted the interest of scientists. Some large scientific programs were carried out in the seventies to study benthos distribution in this area. Among the main listed bivalves, the dog cockle (Glycymeris glycymeris) and the banded carpet shell (Paphia rhomboïdes) are particularly widespread in the Channel Sea and in the "Golfe Normand-Breton", where they are ones of the most abundant species in terms of biomass. In view of their halieutic interest and the existence of an important database describing their distribution,...
Tipo: Text Palavras-chave: Shellfish fisheries; Growth; Ecophysiology; Distribution of benthic invertebrates; Numerical ecological space distributed deterministic modelling; Glycymeris glycymeris; Paphia rhomboïdes; Golfe Normand Breton; Channel Sea; Exploitation des bivalves sauvages; Croissance; Ecophysiologie; Répartition des invertébrés benthiques; Modélisation numérique écologique spatialisée déterministe; Glycymeris glycymeris; Paphia rhomboïdes; Golfe Normand Breton; Manche.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/2004/these-1.pdf
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Variabilité et bioénergétique de la reproduction chez l'huître creuse Crassostrea gigas ArchiMer
Enriquez Diaz, Marta Rosalia.
The variability in reproductive cycle of Pacific oyster, Crassostrea gigas, was evaluated in situ (Bay of Veys, BOV and Marennes-Oléron bay, MOB) and in hatchery culture conditions. Two trophic levels were tested over one year: high food level (HFL) and low food level (LFL). We observed that the phytoplanktonic concentration (chlorophyll a) was the principal factor that influenced gametogenesis intensity and duration. The oysters reared within a high trophic ration (BOV and HFL) shown a hyper-gonad development. However, the spawning efficiency was reduced and partial. Therefore, the resorption period was prolonged until winter. Meanwhile, the oysters reared in a low trophic ration (MOB and LFL) produced a normal gonad with a total spawning in summer and...
Tipo: Text Palavras-chave: Aquaculture; Crassostrea gigas; Genetic factor; Ecophysiology; Gametogenesis; Aquaculture; Crassostrea gigas; Bilan énergétique; Ecophysiologie; Gamétogénèse.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-1095.pdf
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