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Registros recuperados: 139
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Acquisition de donnée en continu sur la matière particulaire de la Baie estuarienne de Marennes-Oléron pendant le bloom printaniter planctonique : effet sur le taux de filtration de l'huître Crassostrea gigas ArchiMer
Heral, Maurice; Razet, Daniel; Prou, Jean.
The continuous obtention of different signals has been achieved for 9 days at a -fixed station during May 1988. The speed and direction of the currents have been monitoring concurrently with "in situ" turbidity and fluorescence in relation with the meteorological conditions. The concentration in particulate matter and the planktonic fluorescence fluctuated in direct relation with the water depth, the speed of the current and with the origin of the water masses. The oysters submitted to these large fluctuated conditions showed not constant filtration rate. The filtration calculated by turbidimeters (2 1 h-l g-1 dry weight) was three time less than the one achieved with fluorimeters (61 h-l g-1 dry weight). The filtration rate were fluctuated but not in...
Tipo: Text Palavras-chave: France; Marennes Oleron bay; Acquirring of continous data; Filtration; Crassostrea gigas; Particular matter; Marennes Oléron; Aquisition données; Courantologie; Filtration; Crassostrea gigas; Matière particulaire.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-3021.pdf
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Amélioration de l'évaluation des stocks de mollusques cultivés en Charente- Maritime ArchiMer
Bacher, Cedric; Deslous-paoli, Jean-marc; Heral, Maurice; Prou, Jean.
The expansion of shellfish culture businesses (oysters, mussels, clams...) gives way to a competition for the use of limited food resources, especially in the Marennes-Oléron basin where water circulation is slow. Increasing the amount of cultivated molluscs leads, from a biological point of view, to:- a drop in growth performances- a rise in chronic mortalities, higher and higher, due to a weakness in the physiological state with a lack of stocks which would have compensated the habitat seasonal shortages (end of winter, etc...)- a greater weakness to diseases, linked to a deficient physiological state and a density rise which increases the proximity rate and thus, parasite propagation speed.For these primary reasons, and for the future of oyster culture,...
Tipo: Text Palavras-chave: Modélisation; Estimation; Echantillonnage; Mollusques; Marennes Oléron; Evaluation stocks.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-3841.PDF
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Approche de l'état physiologique de l'huître creuse Crassostrea gigas au cours d'un cycle saisonnier à Marennes-Oléron ArchiMer
Moal, Jeanne; Samain, Jean-francois; Bodoy, Alain; Le Coz, Jean-rene.
The energy charge was measured for two Crassostrea gigas populations, during an annual survey at Marennes Oleron, to appreciate the condition of health of these oysters. It is assumed that the actual decrease in production of this area is related to a biomass overload which affects the oysters by lowering their scope for growth. Energy charge, an index developped by ATKINSON (1968), defines the energy equilibrium of organisms. It is the adenylic nucleotide ratio: E.C = (ATP + 1/2ADP)/ATP + ADP + AMP). We have measured this parameter to determine the state of health of these oysters. A methodological study has been conducted previously to define the conditions of sampling, conservation and extraction for a HPLC assay. The HPLC method (high performance...
Tipo: Text Palavras-chave: Marennes Oleron; Seasonal variations; Crassostrea gigas; Physiological indice; Nucleotides; Energy charge; Marennes Oléron; Cycle saisonnier; Crassostrea gigas; Indiced physiologique; Nucléotides; Charge énergétique.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-2869.pdf
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Aquaculture traditionnelle de l'huître creuse (Crassostrea gigas - Thunberg) sur le littoral français. Affinage automnal en bassins semi-fermés (claires ostréicoles) ArchiMer
Soletchnik, Patrick; Le Moine, Olivier; Goulletquer, Philippe; Geairon, Philippe; Razet, Daniel; Faury, Nicole; Fouche, Dominique; Robert, Stephane.
L'aquaculture des huîtres est une activité traditionnelle en France depuis le moyen âge. Sur la côte atlantique, dans le bassin de Marennes Oléron, la commercialisation annuelle de C. gigas atteint environ 50 000 tonnes. Cette région bénéficie d'une infrastructure de claires ostréicoles, anciens marais salants, où les huîtres sont affinées avant commercialisation. L'huître est un produit de consommation festif dont les 3/4 se commercialisent durant les fêtes de fin d'année. A l'heure actuelle les techniques d'affinage, visant à améliorer la qualité (goût, coloration, engraissement des huîtres), sont peu fiables. Malgré les aléas météorologiques de la saison automnale, des cultures de diatomées (Skeletonema costatum) sont réalisées avec succès en bassins...
Tipo: Text Palavras-chave: Claires ostréicoles; Affinage; Huître creuse; Crassostrea gigas; Marennes Oléron.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00199/31047/29464.pdf
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Bilan de la surveillance microbiologique du bassin de Marennes-Oléron et de la rive droite de la Gironde (Avril 1989 - Décembre 1992) ArchiMer
Faury, Nicole; Ratiskol, Jacqueline; Ratiskol, Gilles.
La surveillance bactériologique de 1989 à 1992 du bassin de Marennes-Oléron et de la rive droite de la Gironde met en évidence la bonne qualité du milieu. Les dépassements de la norme (>300 coliformes fécaux/100 g de chair et liquide intervalvaire) sont peu fréquents. Quelques pollutions sporadiques peuvent apparaître, le plus souvent en été, et sont liées au dysfonctionnement passager des systèmes d'assainissement (postes de relèvement, stations d'épuration) ou aux infiltrations d'eaux usées dans les réseaux pluviaux. L'application de la directive européenne de 1991 aurait une incidence limitée sur le classement des zones de production conchylicoles du bassin de Marennes-Oléron.
Tipo: Text Palavras-chave: Bactériologie; Surveillance; Coliformes fécaux; Marennes Oléron; Gironde.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00014/12497/9344.pdf
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Capacité trophique du bassin de Marennes-Oléron : couplage d'un modèle de transport particulaire et d'un modèle de croissance de l'huître Crassostrea gigas ArchiMer
Bacher, Cedric.
The trophic relationship between a population of cultivated oysters and potential food was modeled in Marennes-Oleron Bay. Coupling the transport process of particulate matter with assimilation by a population of oysters was achieved through a box mode!. Transport between boxes was based on a mass conservation equation. Parameters were derived from volumes of the boxes, tidal movements and residual 110ws between boxes, and were computed from a numerical hydrodynamical model. Consumption, assimilation and respiration terms were put into an energetic budget equation which enabled simulation of growth. A result of the model was the variability of growth along an axis from North to South, which was related to the oysters' accumulated consumption of food....
Tipo: Text Palavras-chave: Marennes Oleron Bay; Growth; Energetic budget; Crassostrea gigas; Trophic capacity; Box model; Marennes Oléron; Croissance; Bilan énergétique; Crassostrea gigas; Capacité trophique; Modèle en boîtes.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/publication-2882.pdf
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Cartographie des fonds de la Seudre ArchiMer
Massard, Emilie; Geairon, Philippe.
Ce poster présente la bathymétrie du fond de Seudre. Les mesures s'effectuent par couplage d'un sondeur hydrographique à un GPS différentiel à bord d'une embarcation, permettant ainsi l'acquisition et la spatialisation de données en temps réel. Le traitement géostatique a ensuite lieu à partir d'un logiciel spécialisé pour obtenir une cartographie de la cote altimétrique du fond.
Tipo: Text Palavras-chave: Marennes Oléron; Cartographie; GPS; Seudre; Bathymétrie.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/acte-4038.pdf
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Cartographie krigée des mollusques suspensivores compétiteurs trophiques des huîtres du bassin de Marennes-Oléron : l'implications pour la planification de l'échantillonnage ArchiMer
Sauriau, Pierre-guy; Bacher, Cedric.
Stock assessement of wild soft-bottom mol/uses has been part of a general approach to shellfish management in oyster farming in Marennes-Oleron Bay. A sampling survey is described as a stratified random sampling after optimum allocation of the sample sire in each stratum. The aim of this study is ta ilIustrate the use of kriging techniques in the case of suspension-feeders. Regarding suspension-feeding molluscs. trophic competitors of the oyster Crassostrea gigas the whole stratified design produced an estimation with a precision around 25%. Then the geostatistical technique. i.e. kriging was used to depict the spatial and variability patterns of several trophic groups. The biomass data are expressed in ash-free. dry-weight units. In addition, the...
Tipo: Text Palavras-chave: Marennes Oléron; Crassostrea gigas; Krigeage; Suspensivore; Echantillonnage stratifié; Peuplement benthique.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/publication-3055.pdf
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Composition de la matière organique particulaire dans les eaux du bassin de Marennes-Oléron : apport énergétique pour la nutrition de l'huître ArchiMer
Heral, Maurice; Razet, Daniel; Maestrini, Serge; Garnier, Jacqueline.
A twice monthly study shows that the major amount of organic material is from detrtic origin, and is brought in winter, when valeus of mineral seston are very high. In the sping time, phytoplancton blooms, do not make up for lack of detritic material where as in the summer, oceanic phytoplancton is composed of important amounts of carbohydrates. Available food is defined as sum of protids, lipids and carbohydrates and mesured in energetic therms. This allows to foretell the amount of food that molluscs ar likely to assimilate.
Tipo: Text Palavras-chave: Marennes Oléron; Nutrition; Matière organique; Crassostrea gigas; Huîtres.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/acte-3003.pdf
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Contribution à la mise en place de critères de qualité des huîtres creuses Crassostrea gigas affinées en claires ArchiMer
Gras, Marie-paule; Gras, Paul; Cosnard, Michel; Garnier, Jacqueline.
The oysters fattened in the "claires" have a very appreciated quality. Representative criters of this quality: index of condition, the glycogen content, color of gills of molluscs by the pigment called "marennine" and indx of shape of shells are studied for the Japanses oysters Crassostrea gigas (Thunberg)
Tipo: Text Palavras-chave: Ostréiculture; Claires à huître; Crassostrea gigas; Marennine; Verdissement; Marennes Oléron; Charente Maritime.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00009/12009/8701.pdf
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Contribution à l'identification de l'impact des perceurs O. erinacea et O. inornata au cours de la campagne d'évalutation des stocks d'huîtres 2001 ArchiMer
Robert, Stephane; Le Moine, Olivier; Guilpain, Patrice; Soletchnik, Patrick; Faury, Nicole; Razet, Daniel; Geairon, Philippe; Goulletquer, Philippe; Seugnet, Jean-luc.
L' apparition de phénomène de prédation des huîtres par des bigorneaux perceurs n'est pas nouveau. Elle a été régulièrement constatée par la profession ostréicole. C'est ainsi qu 'on a pu enregistrer une destruction massive des bancs d'élevage de la baie de Bourgneuf en 1938. Des problèmes similaires ont été enregistrés dans la région de La Rochelle et à Arcachon en 1932, où des subventions on été allouées pour le ramassage d'Ocenebra erinacea. Ces phénomènes étaient alors liés à cette espèce Atlantique. L'apparition d'Ocenebrelilis inornatus, également connu sous le nom d'Ocenebra inornata, a été signalée en 1995 dans le bassin de Marennes Oléron par P.G. Sauriau comme nouvelle espèce de perceurs. Cette description a été concomitante avec l'augmentation...
Tipo: Text Palavras-chave: Ostréiculture; Impact; Bigorneaux perceurs; Ocenebra erinacea; Ocenebra inornata; Marennes Oléron; Charente-Maritime.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00031/14233/11509.pdf
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Crepidula fornicata L. dans le bassin de Marennes-Oléron - Rapport préliminaire 1982 ArchiMer
Deslous Paoli, Jean-marc.
Des prélèvements dans le bassin de Marennes-Oléron ont permis de localiser les fortes charges de Crepidula fornicata L. principalement dans le centre du bassin (le long du banc de Charret et dans le courant d'Oléron). En ces deux points la charge fraîche cumulée a été estimée à environ 2 700 tonnes. La structure de population fait apparaître une croissance moyenne de 20, 19, 17 et 12 millimètres respectivement pour les 1ère, 2ème, 3ème et 4ème années avec une variabilité très importante dès la première année. 74,5% des animaux constituent des chaines primaires d'en moyenne six individus fixés sur des coquilles de crépidules mortes. La période de reproduction s'étale vraisemblablement du mois d'avril au mois de septembre et 25% des individus portent des...
Tipo: Text Palavras-chave: Crepidula fornicata; Population; Croissance; Reproduction; Marennes Oléron.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00092/20356/18017.pdf
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Croissance de l'huître creuse Crassostrea gigas dans le bassin de Marennes-Oléron de 1987 à 1998 ArchiMer
Le Moine, Olivier; Geairon, Philippe.
This report aims to study the oyster Crassostrea gigas growth and production over a 12 years time's span in the Bay of Marennes Oleron. Results of 12 years of oyster growth did not show any significant oyster biological productivity decrease, nor trend. In contrast, annual growth showed a large variability, which will be correlated with environmental conditions. Moreover, annual growth variability was greater than the variability due to site location, but the Ronce experimental site. The later, located in the south west part of the Bay of Marennes Oleron, has been the leading oyster growth site since 1989. The annual shell growth variability was greater than oyster dry meat weight fluctuation. Both 1990 and 1991 years were characterized by the largest...
Tipo: Text Palavras-chave: Marennes Oleron bay; Crassostrea gigas; Monitoring network; Oyster growth and production; Marennes Oléron; Crassostrea gigas; Réseau de surveillance; Production; Croissance.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/rapport-1588.pdf
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Croissance des huîtres plates en claire et conditions hydrologiques ArchiMer
Trochon, Pierre.
S
Tipo: Text Palavras-chave: Huîtres; Ostrea edulis; Croissance; Claires ostréicole; Seudre; Marennes Oléron.
Ano: 1960 URL: http://archimer.ifremer.fr/doc/00004/11497/8067.pdf
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Croissance et qualité de l'huître Crassostrea gigas Thunberg en élevage dans le bassin de Marennes-Oléron ArchiMer
Deslous-paoli, Jean-marc.
In 1979-1980, the main growth o oysters Crassostrea gigas, in the basin of Marennes-Oleron occured in June and July. The available amount of food and the energetic requirements for the reproduction are important factors determining growth. Tissue weight decreased after spawning until the end of the winter, and this decrease might be related to the high quantities of inorganic particles, in the seston, at that period of the year.
Tipo: Text Palavras-chave: Marennes Oleron; Seston; Growth; Crassostrea gigas; Oysters; Marennes Oléron; Seston minéral; Croissance; Crassostrea gigas; Huîtres.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/1982/publication-2947.pdf
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Culture d'huîtres creuses en eaux profondes dans le Pertuis d'Antioche. Comparaisons avec les cultures sur estran du bassin de Marennes Oléron et de Fouras et les filières d'élevage des Saumonards. Période avril 2001 - février 2002 ArchiMer
Robert, Stephane; Le Moine, Olivier; Razet, Daniel; Geairon, Philippe; Guilpain, Patrice; Soletchnik, Patrick; Faury, Nicole; Seugnet, Jean-luc; Arnaud, Christophe; Chollet, Bruno; Chabirand, Jean-michel; Fleury, Pierre-gildas; Langlade, Aime; Goulletquer, Philippe; Mille, Dominique.
Le Bassin ostréicole de Marennes-Oléron, et globalement la Charente-Maritime, sont marqués depuis les années 80 (Héral, 1986), par un net recul des rendements de production qui engendrent une diminution de la rentabilité économique et un accroissement des coûts de production. La démonstration de la surcharge biologique du Bassin de Marennes-Oléron est faite depuis 1985. Cette situation a évolué depuis cette date, par une diminution des cheptels en élevage et par une augmentation des cheptels sauvages ce qui a abouti à des plans d'entretien et de restructuration du DPM. Cependant, la situation défavorable pour la majorité des zones charentaises en terme de croissance-production est annuellement confirmée, depuis 1993 au moyen des réseaux de croissance...
Tipo: Text Palavras-chave: Ostréiculture; Eaux profondes; Crassostrea gigas; Technique élevage; Croissance; Mortalité; Biométrie; Biochimie; Marennes Oléron.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00072/18369/15940.pdf
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Déterminisme des mortalités estivales d'huîtres creuses Crassostrea gigas dans le bassin de Marennes-Oléron : choix d'un site atelier pilote, prééchantillonnage et perspectives ArchiMer
Le Moine, Olivier; Soletchnik, Patrick; Geairon, Philippe; Razet, Daniel; Faury, Nicole; Goulletquer, Philippe.
Since 1988, seasonal, chronic mortality (up to 30-40 %) has been occurring at oyster farms in the Marennes-Oléron Bay, namely at the Ronce and Perquis sand flats. The particular geographic position on the southern part of the bay, between the Seudre River and the Maumusson Strait, confers a relative specificity to these oyster farming areas. Production in this area is on the order of 8,000 to 10,000 t of the 30,000 t of oysters produced annually in the Bay. Although limited in surface area (180 ha out of a total of 4,500 ha), this high proportion of production can be attributed to the fact that this zone is mostly dedicated to the finishing process before commercialisation. Due to its economic importance, oyster farming is vital for local businesses.
Tipo: Text Palavras-chave: Marennes Oléron; Mortalités; Crassostrea gigas.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3249.pdf
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Développement d'ou outil intégré de gestion spécialisée (Base de données/SIG) des stocks conchylicoles dans les Pertuis Charentais ArchiMer
Le Moine, Olivier.
Estimating farmed shellfish stocks is essential, in terms of both developing shellfish farms and evaluating trophic capacities with respect to existing stocks. At Marennes-Oléron, estimation is carried out every five years, following a multi-layered strategy. First, cluster sampling of areas of 1 ha provided an estimate of biomass per surface area as well as characteristics of oyster farms (age, type of collectors used, etc.). These data were then interpolated to the stratum level. Second, the overall exploitation rate of the stratum was estimated based on coverage by aerial photographs. Both types of data have been processed using special statistical software developed using a database and Kman language (SGBD; Maurer, 1989). Photos were analysed under a...
Tipo: Text Palavras-chave: Marennes Oléron; Pertuis Charentais; Crassostrea gigas; Huîtres; Estimation stocks; SIG.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3264.pdf
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Diversification de la production conchylicole : cultures de palourdes sur estran (Compte rendu n°3) ArchiMer
Goulletquer, Philippe.
Since 1984, experiments have been carried out on clam Ruditapes philippinarum foreshore culture, with a one year pond pre-growth. Culture conditions are now well-known: population level with a tide coefficient of around 70 to 80, sediment of silty or fine grain size, sediment stability over the culture period-between the end of April and November. This culture possibility gives way to a diversification of production in the shellfish culture basin of Marennes-Oléron and can be used as an alternative to oyster overexploitation. Clam densities (2 kg/m²) are five times lower than oyster and the Ruditapes philippinarum filtration rate is 20% lower than that of Crassostrea gigas.
Tipo: Text Palavras-chave: Marennes Oléron; Culture en claire; Culture sur estran; Ruditapes philippinarum.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/rapport-3842.PDF
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Diversification de la production : culture de palourdes sur estran, premiers résultats 1984 semis expérimentaux 1985 ArchiMer
Goulletquer, Philippe.
The study of foreshore clam culture with three immersion levels (40, 50, 70) has demonstrated a backlog in clam growth on the highest level, as well as a reproduction backlog and a weakened physical state during winter for populations unimmersed with a tide coefficient of 40-50. But the available areas for these cultures (areas that have not been allocated to oyster or mussel culture) are those unimmersed with those tide coefficients. Thus, it is not advised to extend the surfaces granted in the Marennes-Oléron basin, but on the contrary to use those granted to oyster culture but which are not exploited. This solution was the one accepted for the 1985 experimental seedings conducted over a 3 000 m² area on the Isles of Ré and Oléron and in Marennes, on...
Tipo: Text Palavras-chave: Marennes Oléron; Mortalité; Biomasse; Croissance pondérale; Croissance linéaire; Estran; Elevage; Palourdes.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-3839.PDF
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