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| Registros recuperados: 67 | |
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| 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 |
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| 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 |
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| 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 |
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| 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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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00089/20062/17703.pdf |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 67 | |
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