Consulta: creatorFacets:"Deslous-paoli, Jean-marc"
Registros recuperados: 67
Data/hora: 07/06/2024 06:37:08

Amelioration de la forme et de la qualite de l'huitre Crassostrea gigas Thunberg dans les claires de Marennes-Oleron.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Zanette, Yvan; Heral, Maurice; Masse, Henri; Garnier, Jacqueline.
The breeding of Pacific oysters Crassostra gigas, in non tidal ponds, before commercialization, brings about an improvement of the shell and of the quantity and quality of the tissues. In fact, the Berthome's indice (1978) moves from 1.36 in June to 0.68 December, and the density of the shell increases in the same time from 1.79 to 1.98. On the other hand, the percentage of tissues in the oyster is 12.4% at the end of gametogenesis and more than 9% at the end of breeding. The dry tissues are composed of 10.3 of ash, 40.3% of proteins, 12.6% of lipids and 9% of carbohydrate. 95% of the carbohydrate are glycogen. The resulting energetic values are measured to 5.10 cal-mg super(-1) of dry tissues ash free.
Tipo: Text
Palavras-chave: Crassostrea gigas; Tissues; Biochemical composition; Shells; Growth; Oyster culture.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1892.pdf

Modelling seasonal dynamics of biomasses and nitrogen contents in a seagrass meadow (Zostera noltii Hornem.): application to the Thau lagoon (French Mediterranean coast)
Provedor de dados: 5
Autores: Plus, Martin; Chapelle, Annie; Menesguen, Alain; Deslous-paoli, Jean-marc; Auby, Isabelle.
A numerical deterministic model for a seagrass ecosystem (Zostera noltii meadows) has been developed for the Thau lagoon. It involves both above- and belowground seagrass biomasses, nitrogen quotas and epiphytes. Driving variables are light intensity, wind speed, rain data and water temperature. This seagrass model has been coupled to another biological model in order to simulate the relative contributions of each primary producer to: (i) the total ecosystem production, (ii) the impact on inorganic nitrogen and (iii) the fluxes towards the detritus compartment. As a first step in the modelling of seagrass beds in the Thau lagoon, the model has a vertical structure based on four boxes (a water box on top of, three sediment boxes) and the horizontal...
Tipo: Text
Palavras-chave: Thau lagoon; Nitrogen cycle; Oxygen cycle; Box model; Seagrass ecosystem.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/2003/publication-461.pdf

Influence du climat sur le recrutement et sur la production d'huîtres cultivées (Crassostrea angulata et Crassostrea gigas) dans le bassin de Marennes-Oléron (France)
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
Recruitment, marketed yield and cultivated biomasses of oysters Crassostrea angulata and Crassostrea gigas are compared to climatic indices for the period 1885-1984. Temperature plays a role up on the date of spawning but explains only partially the failure of recruitment, which has less influence on the marketed yield than on the total biomass Contrary to the sensitivity of wild molluscan stocks to climatic conditions, yield and biomass of these cultivated stocks are not hightly correlated to the annual and seasonal indices of rainfall and air temperature.
Tipo: Text
Palavras-chave: Marennes Oleron Bay; Climatic conditions; Recrutment; Crassostrea gigas; Crassostrea angulata; Oysters; Marennes Oléron; Facteurs climatiques; Recrutement; Crassostrea gigas; Crassostrea angulata; Huîtres.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-2972.pdf

Modélisation de l'écosystème du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Bacher, Cedric; Menesguen, Alain; Raillard, Olivier; Heral, Maurice; Deslous-paoli, Jean-marc; Razet, Daniel.
Une approche analytique permet de coupler un modèle physique avec un modèle biologique qui prédit la croissance des huîtres en fonction de la quantité, de la qualité de la nourriture particulaire et de la température. Ce modèle montre clairement l'effet de surcharge du bassin induisant un ralentissement des performances de croissance avec un gradient marqué du nord au sud. Un modèle phytoplanctonique basé sur les apports respectifs en nitrates de la Charente et de l'océan permet de prédire la production primaire en fonction de la température et de la transparence de l'eau. Une simulation supprimant les apports de la Charente permet de préciser la quantité de phytoplancton dépendant de ces apports. Un troisième modè le s'applique à représenter dans une...
Tipo: Text
Palavras-chave: Modèle de croissance huîtres; Modèle phytoplanctonique; Remise en suspension; Marennes-Oléron.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00439/55045/56481.pdf

Hydrobiologie du bassin de Marennes-Oléron - Résultats du Réseau National d'Observation : 1977 à 1981
Provedor de dados: 5
Autores: Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Manaud, Francois; Truquet, Isabelle; Garnier, Jacqueline.
After determining the seasonal features of the hydrobiology of the Marennes-Oléron's estuarine complex in 1976 and 1977 (Héral et al, 1983), based on seasonal campaigns conducted in 15 stations sampled in a tide half-cycle, it was proposed to monitor 5 stations spread out over the entire basin (figure 1) as part of the National Observation Network (RNO) with two monthly samples taken, one at neap tide, the other at spring tide. In the same way, station 3, at the centre of the basin, was sampled at tide half-cycle, on the same days but with a special effort to determine the dissolved and particulate organic substances. The goal of this paper is to introduce the results of the RNO's hydrobiological parameters at the stations of the Charente (5) estuary, the...
Tipo: Text
Palavras-chave: Substances organiques particulaires; Substances organiques dissoutes; Marennes Oléron; Hydrobiologie.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-2934.pdf

Problèmes posés par l'analyse des relations trophiques huîtres-milieu
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Zanette, Yohann.
A relation between the evolution of biochemical components of molluscs and the available amount of food is difficult to establish. In addition to energy relations we tried to use a factorial correspondance analysis in the study on relation between the evolution of biochemical reserves of tissues of Crassostrea gigas Thunberg and the nutritional ability of the environment. The analysis showed a negative correlation between storing of carbohydrate and lipid reserves and amounts of mineral seston. In the same way, an accumulation of these reserves varies with the biomass of phytoplanctonic populations.
Tipo: Text
Palavras-chave: Marennes Oléron; Potential feeding; Oysters; Trophic relation; Marennes Oléron; Nourriture potentielle; Huîtres; Relations trophiques.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/acte-2939.pdf

Amélioration de l'évaluation des stocks de mollusques cultivés en Charente- Maritime
Provedor de dados: 5
Autores: 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

Modelling nitrogen, primary production and oxygen in a Mediterranean lagoon. Impact of oysters farming and inputs from the watershed
Provedor de dados: 5
Autores: Chapelle, Annie; Menesguen, Alain; Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, Nabila; Vaquer, André; Millet, Bertrand.
An ecosystem model based on nitrogen cycling and oxygen has been developed for the Thau lagoon. It takes into account the specific features of this Mediterranean lagoon, a semi-confined system with watershed inputs and oyster farming. The ecosystem model uses currents calculated by a two-dimensional hydrodynamic model and integrated into a box model. This model is compared with a year survey data and used to estimate nitrogen and oxygen fluxes between the different ecosystem compartments. The yearly simulation shows that the ecosystem behavior is driven by meteorological forcing, especially rain which causes watershed inputs. These inputs trigger microphytoplankton growth, which is responsible for new primary production. During dry periods, nitrogen is...
Tipo: Text
Palavras-chave: Oxygen; Nitrogen; Oysters; Primary production; Box model; Lagoon ecosystem.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-725.pdf

Caracteristiques saisonnieres de l'hydrobiologie du complexe estuariende Marennes-Oleron (France).
Provedor de dados: 5
Autores: Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J.
Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
Tipo: Text
Palavras-chave: Seasonal variations; Salinity; ATP; Estuaries; Turbidity; Hydrobiology; Salinity; Phytoplankton; Estuaries; Biomass; Hydrobiology; Physicochemical properties; Phytoplankton; Environmental conditions; Biomass.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/publication-1854.pdf

Analyse historique de la production conchylicole du Bassin de Marennes-Oléron et essai d'estimation empirique du potentiel conchylicole
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc.
The analysis of the official statistics of commercialised production of oysters (.Crassostrea angutata and Crassostrea gigas ) is achieved from 1866 to 1984 in term of their numbers and weights for the bay of Marennes-Oleron. The number of sanitary labels, multiplied by the mean weight of a crate can also give out the commercialised production   provided it is increased by the bias and decreased by the exterior production of the bay . Thus the production of Portuguese oysters is only 45 000 tons from 1948 to 1957 with a  maximum of 52, 000 tons for respectively 70 000 tons and 280 000 tons for the statistics . AIso, after the epizooties of Crassostrea angulata the production, fell down to 25 000 tons in 1971 according to the number of sanitary labels...
Tipo: Text
Palavras-chave: Crassostrea gigas; Production conchylicole; Analyse statistique.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/0985/acte-2958.pdf

La capacité biotique des bassins ostréicoles
Provedor de dados: 5
Autores: Heral, Maurice; Bacher, Cedric; Deslous-paoli, Jean-marc.
Maurice Héral has been studying, since 1976 at the IFREMER Station of La Tremblade (France), the trophic networks of shellfish-farming ecosystems and, especially, the variability of available food, energy assessment, the ecophysiology of the Japanese oyster; he has set up a comprehensive model of shellfish farming production. He has been managing the Shellfish Farming Ecosystems Laboratory (LEC) since 1980. A specialist of digital models, Cédric Bacher has been working at the LEC since 1985. He invented a strategy of sampling farmed molluscs' biomass and a preliminary, analytic trophic model that combines physical and biological systems. Jean-Marc Deslous-Paoli has been a member of the same laboratory since 1979, where his work focuses on monitoring...
Tipo: Text
Palavras-chave: Modèle analytique; Modélisation; Modéle global; Production; Capacité trophique; Biomasse; Climatologie; Captage naissain; Bassin Marennes Oléron.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/publication-3011.pdf

Crepidula fornicata L. (Gastéropode, Calyptraeidae) dans le bassin de Marennes-Oléron : composition et valeur énergétique des individus et des pontes
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice.
In the bay of Marennes-Oléron, the shell represents 60% and the dry flesh from 3 to 8.5% of the total weight of Crepidula fornicata. Seasonal changes in the biochemical composition of the dry flesh show two periods of spawning for the females and a single period of reproduction for the males, and that the main component of the energy reserve is glycogen. The mean energy value of Crepidula fornicata varies between 15.1 and 19.3 joules/mg of ash-free dry weight of flesh (average 17.7) and this value is higher in the males than the females, during aIl the periods of reproduction. The females lay, as early as their third year, about 56 egg capsules at each spawning, containing a total of Il 725 eggs with an energy value of 22.4 joules/mg ash free dry weight.
Tipo: Text
Palavras-chave: Crepidula Jornicata; Composition biochimique; Valeur énergétique; Marennes-Oléron; Crepidula Jornicata; Biochemical composition; Energy value; Marennes-Oléron.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/publication-2964.pdf

Crepidula fornicata L. (gastéropode) dans le bassin de Marennes-Oléron : structure, dynamique et production d'une population
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
The reproduction of Crepidula fornicata occurs from the end of February to October. This reproduction determines two periods of juvenile settlement, the first early in June and the second early in October.  Because of the lack of distinct cohorts, estimation of production and population dynamics was made according to the location of individuals in the chain. This was confirmed by the agreement between the growth rings of the shells and individual location in the chain. The main chain accounted for 80 per cent of individuals, the others being isolated or in collateral chains. The curvilinear growth of Crepidula fornicata in the bay of Marennes-Oléron follows the equation Le = 81.01 (1-e (-0.400 8(t-0,01)). The average yearly production from a population of...
Tipo: Text
Palavras-chave: Production; Marennes-Oléron; Crepidula fornicata; Dynamique de population; Population dynamics; Production; Marennes-Oléron; Crepidula fornicata.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-2956.pdf

Programme de réimplantation d’herbiers de phanérogames (Zostera noltii/ Ruppia cirrhosa) dans les lagunes de Bages, Ingril et Thau (Languedoc-Roussillon – France).
Provedor de dados: 5
Autores: Hebert, M.; Dupre, Nicolas; Barral, M.; Messiaen, Gregory; Oheix, Jocelyne; Deslous-paoli, Jean-marc; Roque D'Orbcastel, Emmanuelle; Laugier, Thierry.
OBJECTIF DU PROGRAMME - L’objectif de ce projet sur la réimplantation d’herbiers de phanérogames est d’étudier la faisabilité technique et la définition des conditions optimales de réimplantation des herbiers, à petite échelle dans un premier temps (14 m2par site). Les conclusions de cette étude permettront d’étudier la pertinence de poursuivre sur une seconde phase à plus grande échelle. Trois lagunes, caractérisées par un niveau d’eutrophisation compatible avec la réimplantation d’herbiers, ont été sélectionnées pour le projet : l’étang d’Ingril, l’étang de Thau et l’étang de Bages-Sigean .
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00089/20062/17703.pdf

Reproduction naturelle de Crassostrea gigas Thunberg dans le bassin de Marennes-Oleron en 1979 et 1981: Aspects biochimiques et energetiques.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Berthome, Jean-paul; Razet, Daniel; Garnier, Jacqueline.
In summer 1979, the natural reproduction of oysters Crassostrea gigas Thunberg, in Marennes-Oleron basin, produced a large number of juveniles which was not the case in summer 1981. If one compares the evolution of the main constituents of the flesh, one can see that, at the beginning of August, before spawning the male oysters in 1981 contained 6,3% less proteins, 34,2% less lipids and 61,2% less glucids than those in 1979 and respectively 12,3%, 21,3% and 69,8% less as far as females are concerned. The energetic value of ash-free dry flesh of female oysters is nearly the same for the two years whereas for male oysters the value is slightly lower in 1981 than in 1979. The total energetic values of male and female oysters show a slight difference between...
Tipo: Text
Palavras-chave: Crassostrea gigas; Seasonal variations; Food availability; Water temperature; Saccharides; Proteins; Lipids; Biochemical composition; Gametogenesis; Spawning; Sexual reproduction.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1891.pdf

Relations entre la nourriture disponible et la reproduction de mollusques en milieu estuarien : variabilité temporelle de la colonne d'eau
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean; Razet, Daniel.
The study of the trophic relations needs to collect data which can best represent the variability of the populations of molluscan and the parameters of the water. For the water, the main parameters which play a role on the production of molluscan in an estuarine area are the temperature, the seston, and the phytoplanctonic biomass. For the temperature is proposed to sample only twice a month. At the contrary for seston variations which are very large on a tidal cycle and correlated with the currents and the waves, it is necessary to take in count this variability. For the phytoplancton, the annual cycle is well characterized, but the variability at a station is depending on the caracteristic of each water masses. The authors suggest that a sampling...
Tipo: Text
Palavras-chave: Estuarine ecosystem; Trophic relationships; Time variations; Sampling strategies; Ecosystème estuarien; Relations trophiques; Variabilité temporelle; Stratégie d'échantillonnage.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2868.pdf

Effect of orgnotin compounds (TBT) used in antifouling paints on cultured marine molluscs - a literature study
Provedor de dados: 5
Autores: Heral, Maurice; Alzieu, Claude; Deslous-paoli, Jean-marc.
Organotin salts, used as antifouling substances have a deleterious effect on the environment particularly on molluscs and especially on the Japanese oyster Crassostrea gigas. A synthesis of the effects of tributyltin (TBT) on cultured molluscs reveals the following effects: 1) acute and chronic toxicity to the adults; 2) accumulation in the flesh 01 the adults; 3) perturbation 01 reproduction particularly fertility, mortality 01 offspring and decrease in larval growth rate; 4) decrease in the growth rate 01 juveniles and thickening 01 the shell; and 5) modification 01 the physiology al sublethal levels.
Tipo: Text
Palavras-chave: TBT; Crassostrea gigas; Oyster; Marine molluscs; Organotin.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/publication-3016.pdf

Dynamiques des productions et des biomasses des huîtres creuses cultivées (Crassostrea angulata et Crassostrea gigas) dans le bassin de Marennes-Oléron depuis un siècle
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
The evolution of the production of cupped oysters is estimated on a century (1885-1985) with three different sources of data. The total biomass in culture is calculated from productions by knowing regularly the growing rate and the mortality rate of the populations of oysters. It appears that the efficiencies of the culture (P/B) decrease when the stock increase. The production reaches a plateau maximum of 40 000 tons whereas the stock goes on to growth up to 200 000 tons. This plateau correspond to the maximal capacity of production of the ecosystem limited by the trophic capacities of the bay. This work shows that without management of the cultivated oysters, the stocks tend to exceed the minimal biomass which is necessary to reach the maximal potential...
Tipo: Text
Palavras-chave: Biomasse; Marennes Oléron; Huîtres; Crassostrea angulata; Crassostrea gigas.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-2965.pdf

Effet des biodépôts de l'huître Crassostrea gigas (Thunberg) sur l'accumulation de matières organiques dans les parcs du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Sornin, Jean-marc; Feuillet, Michelle; Heral, Maurice; Deslous-paoli, Jean-marc.
The accumulation of biodeposits brings about geochemical modifications of the underlying sediment, that are noticeable. The increase can reach 83% of the amount of organic carbon. By catching the deposits on the spot and by gathering them directly from the oyster tables we get a daily deposit that can weigh, according to season, between 8 and 99 g of carbon a square meter. The recycling of important quantities of organic matter increase the oxygen needs and the most reducing environment provides opportunities for ammonification and reduction of sulfate into sulfur. So we can consider that there is as much as 4 times more sulfurous hydrogen in intensive oyster-growing areas. This output of sulfurs seems to cause the oyster filtration some damage (Ito et...
Tipo: Text
Palavras-chave: Marennes Oleron; Sediment; Oysters; Physiology; Filtration; Biodeposits; Crassostrea gigas; Marennes Oléron; Sédiment; Huître; Physilogie; Filtration; Biodépôts; Crassostrea gigas.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-2955.pdf

Influence d'un élevage ostréicole sur les flux de nutriments et d'oxygène dans un écosystème lagunaire
Provedor de dados: 5
Autores: Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia.
The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of...
Tipo: Text
Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf

Valeurs caloriques de la chair de l'huître Crassostrea gigas Thumberg : estimation directe et biochimique
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice.
Caloric values of the ash-free dried sofkt parts of Crassostrea gigas have been characterized, according to season using a microcalorimeter and biochemical composition. This study shows the difference between the two methods. A conversation factor (8,63 kcal-gr(-1) has been determined for lipid of pacific oyster. Thix work shows that reproduction implies a loss of energy (53% to 63%) for non juvenile oysters. The increase of energetic level necessary to growth is more important for juvenile oysters and is upper than what is lost for reproduction.
Tipo: Text
Palavras-chave: Lipid; Energetic level; Crassostrea gigas; Oysters; Lipide; Teneur énergétique; Crassostrea gigas; Huîtres.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/acte-3162.pdf

Oyster culture in European countries
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc.
Three species of oysters have been or are cultivated in Europe: Crassostrea angulata, C. gigas, and Ostrea edulis. If we follow the taxonomic critera of Grassé,  the European oysters belong to the group of Mollusca, class of Lamellibranchia or Bivalves, order of Filibranchia, family Ostreidae with two genera: C. angulata (Lamarck), Portuguese, cupped oyster; C. gigas, (Thunberg), Japanese or Pacific, cupped oyster; Ostrea edulis (Linné), fiat European oyster.  Some authors think that C. gigas and C. angulata belong to the same species. lndeed, Ranson stated that the characteristics of the larvae are the same, and Menzel obtained viable hybrids (F2) between these two oysters. AIso, Buroker et al. in studying the genetic variations of proteins and enzymes of...
Tipo: Text
Palavras-chave: European countries; Pathology; Methods of culture; Recruitment; Fishery; Salinity and temperature tolerances; Larval development; Growh; Biology; Oyster culture.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/publication-3038.pdf

Programme Charente-Marennes-Oléron Volet Maritime
Provedor de dados: 5
Autores: Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc; De Pontual, Helene; Raillard, Olivier; Maestrini, Serge; Mornet, Francoise; Menesguen, Alain; Sautour, Benoit; Robert, Jean-michel.
Les termes du contrat passé entre le Fond de la Recherche et de la Technologie et l'IFREMER précisent qu ele programmer a pour objectif une gestion rationnelle du milieu conchylicole avec notamment une mise au point de modèles (voir notification de l'aide en annexe). Un premier modèle appelé modèle global par analogie avec les modèles de pêche met en évidence la limite de la capacité trophique du bassin de Marennes-Oléron pour les huîtres cultivées. Un modèle analytique avec un modèle physique simple permet dans un premier temps de développer un modèle de croissance des huîtres en fonction de la nourriture disponible et d'effectuer des simulations qui confirment l'influence du stock sur les performances de croissance des bivalves. Un troisième approche...
Tipo: Text
Palavras-chave: Modèle production; Biomasse; Huître creuse; Crassostrea gigas; Modèle énergétique; Croissance; Modèle multiboîte; Marennes Oléron; Modèle trophique; Marennes Oléron.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00048/15908/13337.pdf

Influence des facteurs climatiques sur la production conchylicole du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean; Deslous-paoli, Jean-marc.
The authors are comparing the recruitment, the commercialised production, the cultivated biomasses of oysters Crassostrea gigas and Crassostrea angulata  with the statistics of the meteorology (1885-1984). The temperature plays a role up on the date of spawning but partialy explains the lack of recruitment, which has less impact on the commercialised production than on the total biomass. The annual and seasonal characteristics of the precipitations and water temperatures do not show tight correlations with the variations of the production and of the biomass, for these cultivated populations in opposition with the sensitivity of the natural molluscan populations towards the climatic factors.
Tipo: Text
Palavras-chave: Meteorology; Recruitment; Biomass; Production; Crassostrea angulata; Crassostrea gigas; Météorlogie; Recrutement; Biomasse; Production; Crassostrea gigas; Crassostrea angulata.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/publication-2968.pdf

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon
Provedor de dados: 5
Autores: Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand.
Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by...
Tipo: Text
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf

Anomalies de croissance de la coquille de Crassostrea gigas dans le bassin de Marennes -Oléron. Bilan de toris années d'observation
Provedor de dados: 5
Autores: Heral, Maurice; Berthome, Jean-paul; Polanco Torres, E.; Alzieu, Claude; Deslous-paoli, Jean-marc; Razet, Daniel; Garnier, Jacqueline.
The appearance and changes of the oyster shell's gelatinous bags have been monitored since 1979. The increase in thickness that causes the growth into a "ball" can be explained by an overproduction of gel. The various environmental factors that can intervene in the secretion of gel are successively examined.
Tipo: Text
Palavras-chave: Oysters; Shell; Crassostrea gigas; Huîtres; Coquille; Crassostrea gigas.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/acte-2943.pdf

Facteurs contrôlant la croissance de Ruditapes philippinarum dans 4 nurseries de production en Charente-Maritime (France)
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Garnier, Jacqueline; Prioul, Daniel; Heurtebise, Serge; Razet, Daniel.
Different types of pregrowth of the Japanese palourde are compared on the some site. The method by upwelling which is the more common used, to have good growth, requires a compromise between the running and the raised biomass.  Two periods are critical, in the summer the growth of mollusks is stopped because of a decrease in the phytoplanktonic production ;  in the winter, a fall in temperature lessens filtration and stops growth. The results concern clams consummatation rates of particular food (chlorophyll, protids, lipids, glucids) as weIl as the way to supply the decreasing growth : increase of phytoplankyonic production in the summer by recycling waters from nurseries that are loaded with ammoniac and raise winter temperatures by using under-ground...
Tipo: Text
Palavras-chave: Nursery; Growth; Ruditapes philippinarum; Clams; Nurserie; Croissance; Ruditapes philippinarum; Palourdes.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2951.pdf

Composition of biofouling communities on suspended oyster cultures: an in situ study of their interactions with the water column
Provedor de dados: 5
Autores: Mazouni, Nabila; Gaertner, J; Deslous-paoli, Jean-marc.
This study was based on in situ experiments conducted in a shellfish lagoon (Thau, France) to determine the interactions between suspended oyster Crassostrea gigas Thunberg cultures and their environment at a seasonal scale. Three groups of descriptors were considered simultaneously during the course of the study: the taxonomic composition of an oyster culture unit (OCU), the nutrient and oxygen exchanges at the OCU-water interface (fluxes) and the water-column characteristics (water). We used a multiple factorial analysis (MFA) to assess in a single reference frame: (1) the seasonal organisation of the taxonomic groups which compose the OCU and (2) the interactions between this multispecific assemblage and the water column. We found strong seasonal...
Tipo: Text
Palavras-chave: Ascidians; Fluxes; Multicompartment approach; Biofouling; Oyster culture.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/1996/publication-809.pdf

Biogeochemical aspects of bottom anoxia in a Mediterranean lagoon (Thau, France)
Provedor de dados: 5
Autores: Souchu, Philippe; Gasc, Anne; Collos, Y; Vaquer, A; Tournier, Henri; Bibent, B; Deslous-paoli, Jean-marc.
Physical and chemical characteristics (temperature, salinity, dissolved oxygen), nutrients [dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and silicate], dissolved organic nitrogen (DON) and phosphorus and particulate matter [particulate organic carbon (POC) and nitrogen (PON) and chlorophyll a] were measured at a station located in the deepest part of the Thau lagoon (8.5 m), France, during a 10 d period of bottom anoxia in summer 1994. The upper 8 cm of sediment were also analyzed for ammonium (NH(4)(+)) and SRP concentrations in the porewater. The study period was characterized by mean wind speed under 4 m s(-1) which induced an increase of surface temperature from 18 to 29 degrees C with the formation of a thermocline. The...
Tipo: Text
Palavras-chave: Anoxia; Nitrogen; Phosphorus; Eutrophication; Thau lagoon; Mediterranean Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00070/18142/15694.pdf

Toxicite des Elements Metalliques Dissous pour les Larves d'Organismes Marins: Donnees Bibliographiques.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
A bibliographic review has been made on the toxicity of ten metals for some marine larvae of commercial interest. We have classified, according to toxicity, organic salts of tin, mercury, silver, copper, zinc, nickel, lead, cadmium, chromium and manganese. Some synergistic effects of metals, temperature and salinity are described as well as the action of silt suspended in water.
Tipo: Text
Palavras-chave: Mollusca; Crustacea; Pollution effects; Bibliographies; Salinity; Temperature; Synergism; Heavy metals; Toxicity.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1885.pdf

A methology for the stocks assessments of cultivated oysters among along the French Atlantic coasts
Provedor de dados: 5
Autores: Bacher, Cedric; Baud, Jean-pierre; Bodoy, Alain; Deslous-paoli, Jean-marc; Dreno, Jean-paul; Heral, Maurice; Maurer, Daniele; Prou, Jean.
An assessment of the reared stocks of the Pacific oyster (Crassostrea gigas ) has been recently conducted on the major French areas of molluscs culture. The methodology proposed included both estimates of densities obtained by subsampling in the field, and aerial photographs which covered the cultivated, intertidal area. The size and the number of samples were designed to reach a precision of 10% on the final assessment in each area. The field work consisted in weighing and counting the oyster in unit areas of 0.5 m2 for the bottom culture or in trays or bags, for the off bottom technique. These results give a better knowledge of the technique evolution and of the general structures in the cultivated areas.
Tipo: Text
Palavras-chave: Modeling; Estimation; Stocks; Crassostrea gigas; Oysters.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-2864.pdf

Alimentation et digestion chez les bivalves
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
Contrairement aux U.S.A., où ils ne représentent que 4,6% de la production marine totale (Chew &amp; Donaldeson, 1985), les productions de mollusques principalement bivalves ne peuvent plus être considérées comme marginales. En France, 100 000 tonnes d'huîtres dont 98% de Crassostrea gigas (Héral &amp; al. 1985) et 85 000 tonnes de moules (Mytilus edulis, Mytilus galloprovinciallis) (Dardignac, 1985) sont produites annuellement. Par ailleurs, de nouveaux élevages se développent, tel ceux des Pectinicidae et de Ruditapes philippinarum sur les côtes atlantiques et méditerranéennes...  
Tipo: Text
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00392/50356/51057.pdf

Comparaison de trois index de qualité de l'huître creuse Crassostrea gigas
Provedor de dados: 5
Autores: Berthome, Jean-paul; Deslous-paoli, Jean-marc; Fernandez-castro, N.
Three indexes of quality of Japanese oyster Crassostrea gigas were studied in 3 lots of oysters bred in the r.1arennes-oléron basin from february to july 1979: condition index of MEDCOF &amp;-. NEEDLER,  thickness coefficient of IMAI &amp; SAKAI and external quality coefficient of BERTHOME. These different indexes were correlated within each lot of oysters. The external quality coefficient is always significantly correlated with condition index, while thickness coefficient is correlated with other two only for one lot, but seemes useful to rate oyster growth better.
Tipo: Text
Palavras-chave: Index de qualité; Croissance organisme; Crassostrea gigas; Huîtres.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/acte-2997.pdf

Factors influencing primary production of seagrass beds (Zostera noltii Hornem.) in the Thau lagoon (French Mediterranean coast)
Provedor de dados: 5
Autores: Plus, Martin; Deslous-paoli, Jean-marc; Auby, Isabelle; Dagault, Francoise.
The primary production and the respiration of Zostera noltii beds in the Thau lagoon were studied by means of the benthic bell jar technique, Concurrently, environmental data (temperature, light and nutrients) as well as morphological data of seagrass meadows (leaf width and height, density of shoots, above/below-ground biomass ratio) were collected with the purpose of explaining most of the observed variations in metabolism, Seagrass plus epiphyte respiration rates were influenced mainly by the water temperature, showing a typical exponential response to an increase in temperature, Surprisingly, measurements of production rates were not related to incoming light intensities recorded at the seagrass canopy level, An equation frequently used for terrestrial...
Tipo: Text
Palavras-chave: Nitrogen contents; Temperature; Intercepted light by canopies; Seagrass ecosystem; Primary production.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-458.pdf

La matière organique particulaire dans les eaux du bassin de Marennes-Oléron et de ses marais adjacents (claires) : conséquences pour la nutrition de l'huître Crassostrea gigas
Provedor de dados: 5
Autores: Heral, Maurice; Zanette, Yvan; Deslous-paoli, Jean-marc; Robert, Jean-michel; Razet, Daniel.
In 1979 and 1980, the characteristics of the particulate organic matter are defined fortnightly through seston analyses. It is very high in the basin and very low in the finishing ponds. The phytoplanktonic biomasses are maximal in May in the estuary, and in June-July in the finishing ponds, with chlorophyll contents 10 times higher than those monitored in the basin. Proteins are generally the main biochemical components found in both environments, with glucids accounting for 20 % and lipids for only 10 % of the biochemical components on average. The C/N ratios are almost constant in the finishing ponds with values around 5, typical of phytoplankton, whereas they are very high in the basin except in spring. In the same way, the protid/chlorophyll and the...
Tipo: Text
Palavras-chave: Crassostrea gigas; Huîtres; Mollusques; Qualité eau; Seston; Matière organique; Claires ostréicoles; Bassin Marennes Oléron.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/acte-6213.PDF

Modélisation des cycles de l'azote et du phosphore dans les sédiments d'une lagune soumise à une exploitation conchylicole
Provedor de dados: 5
Autores: Chapelle, Annie; Mesnage, Valérie; Mazouni, Nabila; Deslous-paoli, Jean-marc; Picot, Bernadette.
A simulation of nitrogen and phosphorus exchanges for the sediment-water interface is presented, The aim of the sttudy is to understand the dynamic behaviour of an eutrophie coastal lagoon (Thau, France), ln situ experiments were performed to estimate the different pools of nitrogen and phosphorus in the water column and in the sediment. The diffusive fluxes between them were also estimated. A numerical mode1, simulating nitrogen and phosphorus cycles, was developed and calibrated with data recorded .at two seasons (winter and summer). This study leads to the conclusion that is necessary to know the different pools of nitrogen and phosphorus in order to estimate which fraction is bioavailable and the rate of nutrient exchange between sediment and water. It...
Tipo: Text
Palavras-chave: Modèle; Phosphore; Azote; Sédiment; Ecosystème conchylicole; Modelling; Phosphorus; Nitrogen; Sediment; Shellfish ecosystem.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00039/15026/12360.pdf

Estimation des stocks conchylicoles par télédection: résulats et perspectives
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Populus, Jacques; L'Herroux, Michel; Brussieux, Marc.
This papers compares modern techniques of remote sensing (numerical) to more classical ones (photo-interpretation) for the assessment of the intertidal zone land use. The study is limited to homogeneous areas of off-bottom cultivation.  The evaluation of the total area was made using both middle scale aerial photographs, with systematic sampling, and SPOT satellite data. These two methods do not allow to measure the off-bottom rearing design length. It is therefore necessary to get more precise information through high resolution data such as classical high scale photographs numerical scanners (MATRA) or C.C.D. cameras.
Tipo: Text
Palavras-chave: Télédétection; Conchyliculture; Estimation stocks.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-2959.pdf

Proposition de programme. Atelier : Lagunes méditerranéennes. Programme : Mise en valeur des lagunes méditerranéennes
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
Tipo: Text
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00341/45245/44681.pdf

Essai de mise en évidence in situ de paramètres biotiques et abiotiques de l'eau et de l'interface eau-sédiment intervenant dans la production de l'huître creuse Crassostrea gigas
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Razet, Daniel; Prou, Jean.
The flesh production of oysters is mainly related to concentrations of dissolved carbon and free amino acids. The younger oysters are dependent on concentrations of pheopigments while the production of the older ones is related to chlorophyll a values of the water-sediment interface. Shell production depends mainly on temperature, but also on the amount of food available: concentrations of dissolved carbon for the younger oysters and values in chlorophyll a of the interface for the older ones.
Tipo: Text
Palavras-chave: Dissolved matter; Pheopigments; Chlorophyll; Marenne Oleron estuary; Crassostrea gigas; Trophic relations; Substances dissoutes; Phéopigments; Chlorophylle a; Estuaire de Marennes Oléron; Crassostrea gigas; Relations trophiques.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-2932.pdf

Morphology and reproduction of Asiatic Ulva pertusa (Ulvales, Chlorophyta) in Thau Lagoon (France, Mediterranean Sea)
Provedor de dados: 5
Autores: Verlaque, Marc; Belsher, Thomas; Deslous-paoli, Jean-marc.
A detailed study of vegetative and reproductive phases of several populations of a common species of Ulva from Thau Lagoon (France, Mediterranean Sea) showed that the material is in good agreement with Asiatic Ulva pertusa Kjellman. Since October 1994, the date of its first observation in Thau Lagoon, U. pertusa has developed abundant reproductive populations. It is highly probable that this species was introduced at Thau along with oyster transfers from the Pacific. Ulva pertusa is new to the Mediterranean Sea.
Tipo: Text
Palavras-chave: Ulva pertusa; Species introduction; Mediterranean Sea; Marine algae; France; Ulva pertusa; Méditerranée; France; Introduction d'espèces; Algues marines.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-746.pdf

Croissance et qualité de l'huître Crassostrea gigas Thunberg en élevage dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: 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

Contribution à l'étude de la biologie de l'huître Crassostrea gigas Thunberg dans le bassin et les claires de Marennes-Oléron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
"Ce travail fait donc partie d'études visant à mettre en évidence et si possible à modéliser les liaisons et intèractions existant entre les huîtres et l eurs écosystèmes dans le cadre d'élevage (Héral, 1977). Pour cela nous suivrons , en parallèle à ces études , l'évolution de la croissance, de la qualité, des réserves biochimiques et de la valeur énergétique de groupes d'huîtres d'âge différent, dans le but d'obtenir des données sur le déroulement du cycle biologique de Crassostrea gigas Thunberg et d'évaluer ses besoins énergétiques. Puis nous tenterons, par une analyse d'intertie (Chardy et al.,1976), de mettre en évidence les facteurs nutritionels qui agissent sur le stockage et l'utilisation des réserves biochimiques,  donc sur la qualité des...
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00441/55213/56686.pdf

Relations milieu-ressources : impact de la conchyliculture sur un environnement lagunaire méditerranéen (Thau)
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, N; Juge, Claude; Dagault, Francoise.
Shellfish farming leaves its mark on the environment in which it has developed, and the men who depend upon it. These changes have altogether balanced the lagoon cycle and have caused disastrous episodic events. Increased water c1arity caused by the uptake of particulate material by shellfish farming allows seagrass to grow in deeper areas of the lagoon (down to five metres). Shellfish farming nutrient transformations increase ecosystem productivity, even if the filtration pressure keeps phytoplankton biomass at a low leveI. Storage of phosphorus and nitrogen in animal tissue limits eutrophication in this ecosystem. Transfer of oysters from growout facilities increases animal and vegetal specific diversity. The presence of large amounts of shellfish allows...
Tipo: Text
Palavras-chave: Lagune; Conchyliculture; Biogéochimie; Benthos; Eutrophie; Lagoon; Shellfish farming; Biogeochemistry; Benthos; Eutrophication.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00039/15032/12365.pdf

Evolution et état du cheptel ostréicole dans le bassin de Marennes-Oléron: intérêt d'une régulation
Provedor de dados: 5
Autores: Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc.
Le bassin conchylicole de Marennes-Oléron assure 40 % des 100 000 tonnes d ' huîtres commercialisées annuellement en moyenne en France (20 000 emplois, 1 milliard de chiffre d'affaire) . La modélisation des équilibres qui s'établissent entre l es stocks mis en culture , et la production annuelle , réalisée par la station IFREMER de La Tremblade , a mis en évidence les résultats suivants : Lorsque la biomasse augmente : a) La production plafonne vers 40 000 tonnes pour une biomasse de l'ordre de 80 000 tonnes avec l'huître japonaise, ce qui correspond à une biomasse équivalente de 130 000 tonnes d'huîtres portugaises. b) La durée du cycle de production d'une huître de 70 g passe de 2 ans à 4 ans. c) Les mortalités courantes passent simultanément de 20 % à...
Tipo: Text
Palavras-chave: Production; Ostréiculture; Biomasse; Modélisation; Marennes Oléron.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00048/15909/13338.pdf

Assessment of energetic requirements of reared molluscs and of their main competitors
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
In the context of aquaculture in open sea• the amount: and qua11ty of food is variable according to the season and the physical flux in the ecosystem (carrying capacity  ecosystems ). Thus to predict the potential al production of a cultivated ecosystem,  it is mandatory 'co know ~he seasona1 changes in organisms energy balance of cultivated organisms. These changes result from the environmental  variability either  in the temperature  or more significantly in the nutrients supply (Bayne and Newell, 1983).  The techniques of physiological energetics allow to understand the adaptations of the energy balance in bivalve molluscs and to calculate the complete energy budget all  over the seasonal variations of the field. Such studies are few, they include...
Tipo: Text
Palavras-chave: Crepidula fornicata; Perna perna; Mytilus chilensis; Mytilus edulis; Mercenaria mercenaria; Crassostrea gigas; Scrobicularia plana; Physilogy; Energy balance; Carrying capacity ecosystems.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-2960.pdf

Bilan energetique d'une population naturelle de Crepidula fornicata dans le bassin de Marennes-Oleron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Masse, H.
An energy budget has been evaluated for a natural population of Crepidula fornicata living at low water of spring tides in the oyster farming basin of Marennes-Oleron. This budget of production was estimated according to the position along the chain. The average biomass for an individual representative of the population was equivalent to 1.87 Kjoules, and the annual consumption C was 20.08 Kjoules/year. The energy budget expressed in percent of energy consummates was: C = Pg + Pr + Ps + R + F; 100 = 4.6 + 1.6 + 0.8 + 48 + 45. This budget is compared with literature data on other herbivorous gastropods and with those calculated for Crassostrea gigas in the same locality.
Tipo: Text
Palavras-chave: Bivalvia; Crepidula fornicata; Seasonal variations; Population structure; Energy budget; Bassin de Marennes Oléron; Bilan énergétique; Crepidula fornicata.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1181.pdf

Estimation des stocks d'huîtres cultivés : cas du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
Une estimation des stocks d'huîtres, pour quoi faire? Lorsque les stocks augmentent, la production commerciale plafonne vers 40 000 tonnes, la durée du cycle de production d'une huître de 70 g passe de 2 ans à 5 ans et plus, les mortalités courantes passant simultanément de 20 à 70 %. Le déséquilibre ainsi crée est favorable au développement des épizooties telles celles provoquées par la maladie des branchies de 1966 à 1969 et par des Iridovirus inconnus en 1970. La production d'un bassin semi-fermé comme celui de Marennes-Oléron est limitée par la capacité trophique du milieu. On aboutit rapidement à une surexploitation d'un tel système.
Tipo: Text
Palavras-chave: Ostréiculture; Estimation stocks; Biomasse; Croissance; Crassostrea gigas; Bassin de Marennes Oléron; Charente Maritime Dep.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00102/21323/18945.pdf

Approche de la capacité trophique d'un écosystème conchylicole
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
After a short bibliographical study of the different approaches for determination of the trophic capacity of a bay for molluscs culture, the authors, with a global mode, show the relations between the growth performance of the oysters Crassostrea gigas in relation with the cultivated stocks. The volumes of consumed and assimilated food are calculated for the stocks in relation with the incoming volumes of water in the bay and the residence time for neap tide and spring tide. The authors find a decrease of growth rate in relation with the volume of consumed food. When it is above 60% and when the volume of assimilated food is above 20%, there is a large decrease of the growth of oysters.
Tipo: Text
Palavras-chave: Crassostrea gigas; Oysters; Stock assessment; Models; Food consumption; Growth; Biomass; Stock cultivé; Biomasse; Croissance; Modèle; Crassostrea gigas; Huîtres; Capacité trophique.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-3834.PDF

Evolutions quantitatives et qualitatives du seston dans une claire à huîtres : relation avec la sédimentation et la biodéposition
Provedor de dados: 5
Autores: Sornin, Jean-marc; Delmas, Daniel; Deslous-paoli, Jean-marc.
Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne d'une augmentation de matière organique importante (jusqu'à 17 mg.1(-1). Pendant cette période, la sédimentation naturelle est supérieure à 350 g.m(-2).j(-1). La biodéposition (fèces + pseudofèces) suit l'évolution des capacités de rétention des huîtres. Dans ce type de bassin fermé, cette capacité est liée à la qualité des matières en suspension. En période estivale, les fortes teneurs en matière organique du seston (entre 5 et 17 mg.1(-1)) dispensent les mollusques...
Tipo: Text
Palavras-chave: Crassostrea gigas; Oysters; Biodeposition; Sedimentation; Suspension; Particulate organic matter; Crassostrea gigas; Huîtres; Biodéposition; Sédimentation; Suspension; Matière organique particulaire.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-7309.pdf

Eléments azotés de la colonne d'eau et de l'interface eau-sédiment du bassin de Marennes-Oléron : influence des cultures d'huîtres
Provedor de dados: 5
Autores: Feuillet-girard, Michelle; Heral, Maurice; Sornin, Jean-marc; Deslous-paoli, Jean-marc; Robert, Jean-michel; Mornet, Francoise; Razet, Daniel.
The respective influences of the sediment and of oyster (Crassostrea gigas) farming on the accumulation and the recycling of different forms of organic and inorganic nitrogen are described. Fluxes of dissolved inorganic and organic forms of nitrogen were studied between the water column, the water overlying the sediment and the pore waters, while for particulate forms the fluxes were studied between suspended material, the "biodeposits" (faeces and pseudofaeces of Crassostrea) and the sediment. The flux of inorganic nitrogen amounts to 10.5 106 g.m(-2). Yr(-1), while that of organic nitrogen is half this figure. The particulate flux is 15.106 g.m(-2).yr(-1). On the other hand, the phytoplanktonic nitrogen accounts for only 6% of the total particulate...
Tipo: Text
Palavras-chave: Marenne Oleron; Sediment; Pore water; Interface; Crassostrea gigas; Nitrogen; Marennes Oléron; Sédiment; Eau interstitielle; Adsorption; Interface; Crassostrea gigas; Azote.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/publication-2878.pdf

Modélisation des écosystèmes conchylicoles : bassin de Marennes-Oléron - Rapport de fin de Contrat
Provedor de dados: 5
Autores: Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc; De Pontual, Helene; Raillard, Olivier; Ravail, Brigitte; Maestrini, Serge; Mornet, Francoise; Menesguen, Alain; Sautour, Benoit; Robert, Jean-michel.
Les termes du contrat passé entre le Fond de la Recherche et de la Technologie et l'IFREMER précisent qu ele programmer a pour objectif une gestion rationnelle du milieu conchylicole avec notamment une mise au point de modèles (voir notification de l'aide en annexe). Un premier modèle appelé modèle global par analogie avec les modèles de pêche met en évidence la limite de la capacité trophique du bassin de Marennes-Oléron pour les huîtres cultivées. Un modèle analytique avec un modèle physique simple permet dans un premier temps de développer un modèle de croissance des huîtres en fonction de la nourriture disponible et d'effectuer des simulations qui confirment l'influence du stock sur les performances de croissance des bivalves. Un troisième approche...
Tipo: Text
Palavras-chave: Modélisation; Production; Biomasse; Huîtres creuses; Crassostrea gigas; Capacité biotique; Bassin de Marennes Oléron.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00048/15904/13332.pdf

Oxygen fluxes involving the benthic micro- and macrophytic components in the Thau Lagoon under pre-anoxic conditions
Provedor de dados: 5
Autores: Plante Cuny, Marie-reine; Plante, Raphaël; Mazouni, Nabila; Fontaine, Marie-france; Souchu, Philippe; Deslous-paoli, Jean-marc; Grenz, Christian.
Measurements of oxygen fluxes at the water-sediment interface (transparent and opaque enclosures) were made on bare sediments inhabited by microphytes on the one hand, and on sediments diversely colonized by macrophytes (macroalgae and seagrasses) on the other hand. Five stations, typical of different biotopes of a Mediterranean shallow lagoon were studied from May to July 1993 in order to observe an anoxic event which usually occurs at that time of the year. Average diurnal respiration of benthic communities ranged from 40 mg (or 1.25 mmol) O-2 m(-2) h(-1) in bare sediments (31 % of the lagoon area) to 76 mg (or 2.37 mmol) O-2 m(-2) h(-1) in sediments with a medium coverage of macroalgae (37 % of the total area) and, finally, to 100 mg (or 3.12 mmol) O-2...
Tipo: Text
Palavras-chave: Thau France; Mediterranean coastal lagoon; Micro macrophytobenthos; Oxygen fluxes; Thau (France); Lagune côtière méditerranéenne; Micro macrophytobenthos; Flux d'oxygène.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-839.pdf

Intérêt du préélevage de l'huître Crassostrea gigas en claire
Provedor de dados: 5
Autores: Zanette, Yvan; Deslous-paoli, Jean-marc.
Since the disappearance of Crassostrea angulata LMK during the epizootics of 1970-72, Crassostrea gigas Thunberg has been cultivated in the Marennes-Oléron basin. The latter, which could reach its commercial size at 18 months (His, 1978), no longer reaches it until 36 months. The harvesting of these oysters as well as their pre-fattening is currently done mainly in the estuaries of the Charente and the Seudre. The growth of C. gigas could be improved by separating the oysters from collectors sooner than usually done and fattening them sooner.
Tipo: Text
Palavras-chave: Marennes Oléron; Claires ostréicoles; Elevage; Crassostrea gigas.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/publication-2954.pdf

Evolution saisonnière de la filtration de bivalves intertidaux dans des conditions naturelles
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Goulletquer, Philippe; Boromthanarat, Wilaiwan; Razet, Daniel; Garnier, Jacqueline; Prou, Jean; Barille, Laurent.
The study of cultivated ecosystems, once the trophic capacity ha! been determined and the molluscan stocks estimated, requires a knowledge of  the evolution of the seasonal consumption of food by molluscs in natural conditions. For Crassostrea gigas, Mytilus edulis, Cerastoderma edule, Ruditapes philippinarum, the amount and quality of food have no effect on the filtration rate, except for the high load of mineraI seston. First an increase of the filtration rate was shown for Mytilus edulis and Cerastoderma edule at the end of winter and beginning of spring. Moreover Crassostrea gigas and Ruditapes philippinarum have shown no increase or only a small summer one. This evolution did not seem to be linked with the environmental conditions (temperature,...
Tipo: Text
Palavras-chave: Natural food; Bivalves; Filtration rates; Nourritures naturelles; Bivalves; Taux de filtration.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-3304.pdf

Absence de captage de Crassostrea gigas dans le bassin de Marennes-Oléron en 1981 : causes et conséquences
Provedor de dados: 5
Autores: Berthome, Jean-paul; Deslous-paoli, Jean-marc; Heral, Maurice; Razet, Daniel; Garnier, Jacqueline.
The want of C. gigas spat-catching in the Marennes-oleron basin in 1981 can be due to various different reasons which are analysed here. Physico -chemical and trophic factors that can induce variations in the quality of gametogenesis, are successively in comparison with the year 1979 when reproduction was good. The biochemical evolution and a study of gonads slow a lack in maturation in 1981 even during the summer period. Late maturation of gonads bring about physiological consequences which induced mortality of cultivated oysters at the end of winter. A feeble recruit and a decrease of the cultivated stock have economic consequences which here sketched up.
Tipo: Text
Palavras-chave: Larvae; Recrutment; Spat; Crassostrea gigas; Oysters; Larves; Recrutement; Captage; Crassostrea gigas; Huîtres.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2948.PDF

Transformation du matériel fécal de Crassostrea gigas: évolution biochimique à court terme
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Jousset, Jacques.
Que ce soit dans les études de digestion des mollusques effectuées dans le milieu natural ou en laboratoire, ou pour mesurer l'impact des élevages de mollusques sur les sols sous-jacents, l'étude des biodépôts des mollusques se généralise. Cependant, les temps de séjour dans l'eau peuvent entraîner des modifications très importantes dans la composition de ces biodépôts.
Tipo: Text
Palavras-chave: Crassostrea gigas; Biochemical changes; Faeces; Crassostrea gigas; Transformtion biochimique; Fèces.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-7365.pdf

PISCICULTURE - ENVIRONNEMENT : Les bases de physique et de biologie marine en soutien à la législation des ICPE en Méditerranée.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Dosdat, Antoine; Peruzzi, Stefano.
The demand for sea products is going only to increase in the years to come. Capture fisheries will not be enough (80 million tons / year) to supply and fish farming (38 million tons of products o fthe sea in 1998) already stands out to itself as a dominating actor. One of the missions of Ifremer in the field of the fish farming is the harmonious development of the field by mastering possible impacts due to rearing. The Institute developed competence in immunology, physiology, genetics, pathology and food. This study report of impact on the useful bases of physic and biology to elaborate the impact studies in marine fish farming, within the framework of the french law on the Classified Installations for Environmental Protection (ICPE), confined in the...
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00059/17022/14526.pdf

Répartition géographique et structure de population de Crepidula fornicata Linné dans le bassin de Marennes-Oléron en 1981 et 1982
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Masse, Henri.
Hundred and ten samplings were made in the bay of Marennes Oleron, during the summer 1981. They allow to localize the hight loads of Crepidula fornicata in the middle of the bay (along the mud-bank of Charret and in the courante d'Oleron°.  In this two Points, we value the dry biomass at about 2,3 kg/m2 on the mud-bank of Charret and at 1,1 kg/m2 in the courante d'Oleron. The weight present on this two banks (about 550 000 m2) is approximatively 700 tons of slipper limpets. The mean growth rate is 20, 19, 17 and 12 mm respectively on the 1"-, 2n ,3rd and  4th year with a very important variability since the first year. 74,5 %of the individuals form the main chains (mean of 6 slipper limpets) attached on shells of dead slipper limpets.  Some solutions of...
Tipo: Text
Palavras-chave: France; Marennes Oleron; Geographical repartition; Crepidula fornica; Répartion géographique; Marennes Oléron; Crepidula fornicata; Crépidules.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2950.pdf

Variations saisonnières in situ de la production et de la composition des biodépots de trois mollusques estuariens (Mytilus edulis, Crassostrea gigas, Crepidula fornicata)
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Sornin, Jean-marc; Heral, Maurice.
The biodeposition was quantified on the field with sediment traps. All over the year, the biodeposition was the lowest for Crepidula fornicata. Mytilus edulis rejected more biodeposits during winter, and Crassostrea gigas during spring and autumn. The percentage of organic matter sonsumed and digested was higher during summer. The constituttive elements of the digested organic matter was not always the same, all over the year. The energy content of the digest fraction was higher in spring. For Mytilus edulis the ration intake was higher in winter and spring, related with the gametogenetic ans spawning period. An analysis of the mineral constutents of the natural food was made.
Tipo: Text
Palavras-chave: Crepidula fornicata; Crassostrea gigas; Mytilus edulis; Digestibility; Biodeposition; Crepidula fornicata; Crassostra gigas; Mytilus edulis; Digestibilité; Biodéposition.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2691.pdf

Modèle énergétique uniboite de la croissance des huîtres (Crassostrea gigas) dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Bacher, Cedric; Heral, Maurice; Deslous-paoli, Jean-marc; Razet, Daniel.
The growth of oysters (Crassostrea gigas) is modeled in order to study the trophic capacity of the Bay of Marennes Oléron. Total seston and amount of protids, lipids, and carbohydrates converted to energy are the environmental factors taken into account. Time series of these variables are derived during 2 yr with a daily time step from a linear regression including the tidal velocity, the height of the water column, and the wind velocity. A model of the energetic budget based on assimilation and respiration terms and depending on the previous time series is run to simulate the individual growth of an oyster. The knowledge of the number of oysters, the flow of water entering the bay, and the volume of the bay allows us then to estimate that 7% of the...
Tipo: Text
Palavras-chave: Marennes Oléron; Crassostrea gigas; Huîtres; Croissance; Modélisation; Marennes Oleron bay; Crassostrea gigas; Oysters; Growth; Modelisation.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/publication-3051.pdf

Biochemical composition and energy value of Crassostrea gigas (Thunberg) cultured in the bay of Marennes-Oleron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice.
In the bay of Marennes-Oleron the dry flesh of Crassostrea gigas ranged from 29 to 52% proteins, 10 to 23% ash, 6 to 20% lipids and 0 to 4% carbohydrates of which 48.3 ± 21.6% were glycogen. The energy value ranged from 18.84 to 23.47 joule. Mg(-1) ash free dry weight (mean 20.27 J. mg(-1). Reproductive effort varied from 17.8 to 55.9% dry weight for males, and 43.1 to 61.9% for females during the first and third year of reproduction respectively. A high energy value for female gametes (23.47 to 26.24 J. mg(-1) dry tissue) was mainly due to a higher level of lipids (17.3 to 23% of dry tissue) in female gametes as compared to that in male gametes (5.9 to 12.3% of dry tissue). During the period of mass-loss which began in October and finished in March, the...
Tipo: Text
Palavras-chave: Crassostrea gigas; Winter loss of flesh; Reproductive effort; Energy value; Biochemical composition; Crassostrea gigas; Amaigrissement hivernal; Effort de reproduction; Valeur énergétique; Composition biochimique.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/publication-2872.pdf

Feeding and digestion with bivalves
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
On the contrary to the U. S. where they represent but 4.6% of the total marine production , mollusc, principally bivalves, can no longer be considered as a marginal production. In France, 100 000 ton of oysters, 98% of which is represented by Crassostrea gigas (Héral &amp; al., 1985) and 85 000 ton of mussels (Mytilus edulis, Mytilus edulis galloprovincialis) (Dardignac, 1985) are produced yeraly. Elsewhere, new rearings are being developed, such as pectinidae and Ruditapes philippinarum, on the Atlantic and Mediterranean coasts. The species presently cultured, some of which dependiing only on natural collections (Crassostrea gigas, Mytilus edulis, Mytilus galloprovincialis while others depend on hatchery production, either partially Crasssotrea gigas in...
Tipo: Text
Palavras-chave: Ruditapes decussatus; Ostrea edulis; Mytilus edulis; Crassostrea gigas; Bivalves; Physiology; Digestion; Feeding.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-7476.pdf

Modelling of oxygen and nitrogen cycling as a function of macrophyte community in the Thau lagoon
Provedor de dados: 5
Autores: Plus, Martin; Chapelle, Annie; Lazure, Pascal; Auby, Isabelle; Levavasseur, G; Verlaque, M; Belsher, Thomas; Deslous-paoli, Jean-marc; Zaldivar, J; Murray, C.
A three-dimensional model coupling physical and biological processes for the whole Than lagoon (Mediterranean coast of France) was developed in order to assess the relationships between macrophytes and the oxygen and nitrogen cycles. Ten species have been inserted as forcing variables in the model. Plankton dynamics, shellfish cultivation impact and mineralization of organic matter are also considered, as well as nutrient and oxygen exchanges between the sediment and the water column.   Simulations with and without the macrophytes have shown that the system can be characterized as having a highly structured pattern involving lagoon nitrogen and oxygen cycles. This pattern is created by the combined influence of macrophytes, watershed and oyster farming....
Tipo: Text
Palavras-chave: Thau lagoon; Biogeochemical cycles; Ecological modelling; Macrophytes.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/2003/publication-459.pdf

Transferts énergétiques entre l'huître Crassostrea gigas de 1 an et la nourriture potentielle disponible dans l'eau d'un bassin ostréicole
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice.
A paraIleI study of the available energy in the water and of the energy balance of one year old Crassostrea gigas has been made in Marennes-Oleron. Also, from the 32.95 \06 Kcal/m2 that goes through a waterspout of 0,1 m (5.96 \06 Kcal/m2 from phytoplancton, and 64.1 102 Kcal/m2 for the bacteria), an average of 0.19 70 is used by the oyster population. 5 343 Kcal of that annual consummate energy (20 383 Kcal) are assimilated, and 15 035 Kcal (73.8 70) are rejected as feces pseudofeces. From the assimilated energy, 4 317 Kcal (80.8 %) was available for the metabolism and 19.2 % for production of tissue (567 Kcal), shell (281 Kcal) and gametes (182 Kcal). However in the winter the production efficiency are negative ant it is considered that the overload in...
Tipo: Text
Palavras-chave: Marennes Oleron estuary; Crassostra gigas; One year old; Energetic flow; Estuaire de Marennes Oléron; Crassostrea gigas de 1 an; Transfert énergétique.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-2930.pdf

Matière en suspension et sédimentation dans la lagune de Thau
Provedor de dados: 5
Autores: Pichot, Paul; Deslous-paoli, Jean-marc; Juge, Claude.
Thau is a mediterranean lagoon with a large productive stock of molluscs (oysters, mussels) cultivated on suspended tines and colonised by epibionta (ascidia and others invertebrates, algae, etc ... ). This study was developed as part of the PNOC-OXYTHAU.programme. Its aim was to analyze the effects of oyster farrning on water-mass surrounding structures loaded with suspended molluscs and proximal watermass separating these structures. This study concems particulate suspended matter and deposits of particulate organic matter on the bottom after sedimnentation. Biochemical measurements were carried out for nitrogen, carbon,  proteins, lipids and carbohydrates. ln order to estimate sedimentaton, bottom sediment traps were used
Tipo: Text
Palavras-chave: Méditérranée; Etang de Thau; Matière en suspension; Azote; Carbone; Protites; Lipides; Glucides; Sédimentation; Mediterranean; Lagoon of Thau; Particulate suspended mattter; Nitrogen; Carbon; Proteins; Lipids; Carbohydraes; Sedimentation.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00425/53662/54501.pdf

Mytilicola orientalis Mori, Crassostrea gigas Thunberg's parasite, in the basin of Marennes Oleron : impact on the condition and the biochemical composition of oysters during rearing
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
Crassostrea gigas Thunberg's infestation by Mytilicola orientalis. Mori in 1979 in the basin of" Marennes-Oléron presents two maxima,  one during spring, the other during autumn. The parasites have infested until 64 %of bred oysters.. The intensity of infestation la weak (93.5 %of oysters are infested by lass than six females) and depend on the hosts'size. By this fact, slgnificant impact appears only in spring and in winter. A middle infestation of more than three M. orientalis females seems to induce a significant decrease of rates of carbohydrates and of glycogen
Tipo: Text
Palavras-chave: Infestation; Biochimical composition; Parasite; Crassostrea gigas; Mytilicola orientalis; Infestation; Biochimie; Parasite; Crassostrea gigas; Mytilicola orIentalis.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/acte-2938.pdf

Reproduction et recrutement de Mytilus edulis L. cultivée sur les bouchots du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Boromtharanat, S; Deslous-paoli, Jean-marc; Heral, Maurice.
Observations on the gonads of 50 mm mussels, made during 1983 and 1984, showed that the onsert of gametogenesis occured during September and that the gonads reached maturity in December. Spawning took place from early February to April at temperatures from 10 to 12°C. The flesh had a high water content at the beginning of the spawning period. The pelagic live of the larvae lasts about 30 days with settlement occurring in June when some 90 and 100 spats settle on 1 cpm of rope per day. The intensity of recruitment was 56.10(4) and 722.10(4) larvaes on rope corresponding to a square meter during 1983, and between 28.10(4) and 81.10(4) during 1984.
Tipo: Text
Palavras-chave: Crawl; Recruitment; Reproduction; Mytilus edulis; Bouchot; Recrutement; Reproduction; Mytilus edulis.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2865.pdf