Consulta: creatorFacets:"Prou, Jean"
Registros recuperados: 92
Data/hora: 06/06/2024 15:31:11

Rejets d'elevage de poissons en eau de mer: Consequences pour l'huitre Crassostrea gigas.
Provedor de dados: 5
Autores: Coeurdacier, J.-m.; Heral, Maurice; Liange, M.; Moreau, Jean; Prou, Jean; Razet, Daniel; Williot, P.
Reject waters from sea fish-ponds of rearing trout and turbot show increased ammonia and phosphate values. Protid, lipid and glucid contents of the waters remain low, with total values which do not overpass 1.7 mg.l super(1). After showing that the oysters were likely to absorb sewage from fish farming ponds, the authors examine whether, for epidemiologic and rearing methods reason, it is possible for both types of farming to cohabit as for as zoopathology is concerned. The possible accumulation of antibiotic in mollusks and antibioresistance transfer to germs may be pathogenic for man, are also discussed.
Tipo: Text
Palavras-chave: Aeromonas hydrophila Escherichia coli Crassostrea gigas Bivalvia Antibiotics Growth Environmental effects Bacteria Shellfish culture; Pollution effects Fish culture.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/publication-1855.pdf

Feeding of Crassostrea gigas at high seston load : modeling requirements
Provedor de dados: 5
Autores: Barille, Laurent; Prou, Jean.
Ecophysiological experiments conducted in situ in the Bay of Marennes-Oléron during a spring and neap tide cycle in May 1991 , were designed to get a better representation of 2 important components of the energy budget of the Japanese oyster Crassostrea gigas : clearance rate and selection efficiency. The relationships previously established by Raillard et al. ( 1993) are re-evaluated by integrating the effects of high seston loads, typical of tidal effect within estuaries, on the physiological processes. For the clearance rate, the re-evaluated parameterization includes: - a negative effect of turbidity. - a clogging threshold set to 192 mg/l. Selection efficiency parameterizations are modified by incorporating : - a constant inorganic ingestion for...
Tipo: Text
Palavras-chave: Matematical model; Oyster; Crassostrea gigas; Clearance rate; Seclection efficency; Marennes Oleron; Charente Maritime.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00102/21299/18913.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

Système d'Information à référence spatiale et gestion d'un espace de production ostréicole : le cas du bassin de Marennes Oléron (France)
Provedor de dados: 5
Autores: Loubersac, Lionel; Populus, Jacques; Durand, Christophe; Prou, Jean; Kerdreux, Michel; Le Moine, Olivier.
Maintaining shellfish production activities, ensuring their quality and optimising the management of reserved space use with a perspective of sustainable growth are questions that interest a very significant block of French coastal sites. To achieve such objectives, it must especially be possible to relate the spatial distribution of the farmed stocks and environmental constraints: physical characteristics of the environment, nutritive resources, health constraints, environmental protection constraints...
Tipo: Text
Palavras-chave: Aménagement Littoral; Sédimentologie; Bathymétrie; Méthodologie; Cadastre; Bassin de Marennes Oléron; Traitement des données; Système d'Information géographique; SIG.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3092.pdf

Le marais salé des pertuis charentais : à la recherche d'un développement durable
Provedor de dados: 5
Autores: Prou, Jean; Heral, Maurice.
Sustainable development of the marine part of the wetlands located on the Atlantic coast of France (Pertuis Charentais) implies the difficult integration of European and national regulations in the regional frame. Spatial and temporal patterns of this area show the strong relationship between human activities (salt, sheIlfish farming, agriculture, fisheries...) and physical evolution of this area. Regulations based on zoning have to be completed by more precise studies including the major role of water uses regulated by human practices.
Tipo: Text
Palavras-chave: Regulations; Shellifish farming; Sustainable development; Wetlands; Pertuis Charentais; Ostréiculture; Développement durable; Marais salé.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3235.pdf

Qualité des milieux naturels
Provedor de dados: 5
Autores: Legube, Bernard; Montigny, Frédéric; Bustamante, Paco; Bareille, Gilles; Baudrimont, Magalie; Cachot, Jerome; Guibaud, Gilles; Hechard, Yann; Labanowski, Jérôme; Lacoue-labarthe, Thomas; Mondamert, Leslie; Budzinski, Hélène; Prou, Jean; Gazeau, Alain; Hulin, Agnès; Bunales, Rafaël; Villenave, Eric; Chabbi, Abad; Atteia, Olivier; Bouchon, Didier; Denaix, Agnès; Chery, Philippe; Pellerin, Sylvain; Rumpel, Cornelia.
L’impact du changement climatique sur la qualité et la pollution des milieux est souvent négligé par rapport à d’autres impacts plus médiatisés (e.g. événements climatiques et hydrologiques extrêmes, santé, trait de côtes, disponibilité des ressources en eau…). Les eaux et l’air de Nouvelle-Aquitaine, et à moindre mesure les sols, déjà significativement pollués, subiront pourtant plusieurs détériorations significatives, qui sont présentées et discutées dans ce chapitre. Certains de ces effets sont déjà visibles et vont s’aggraver dans le contexte climatique prévu. Il s’agit principalement, pour l’eau douce superficielle, de l’augmentation de la température, de la diminution des débits des cours d’eau, de l’évolution des espèces aquatiques et du...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55578/57190.pdf

Enhanced surveillance of shellfish mortality to improve early detection and investigation of outbreaks of exotic or emerging infectious diseases: An example of a mass mortality outbreak of mussels, France 2014
Provedor de dados: 5
Autores: Lupo, Coralie; Prou, Jean.
This paper explores the relevance and feasibility of enhanced surveillance of mussel-related mortality based on regular telephone interviews of a key informant in a farming community. Based on qualitative analyses of data collected through semi-structured interviews, this method of participatory disease surveillance enabled the retrieval of high quality data during an outbreak of mussel mortality which occurred in Pertuis Charentais, France, in 2014.  The findings illustrated that such an enhanced surveillance approach compared with the institutional shellfish health surveillance system could improve the early detection of outbreaks of mussel mortality by one week. This approach enabled a detailed description of the outbreak, showing higher incidence...
Tipo: Text
Palavras-chave: Early warning; Perception; Enhanced clinical surveillance; Shellfish diseases; Participative disease surveillance; Qualitative methods.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00348/45914/45708.pdf

Compte-rendu de mission en Tunisie (13-17 Juin 2005). Atelier de travail sur les nouvelles perspectives de la recherche scientifique en aquaculture
Provedor de dados: 5
Autores: Thouard, Emmanuel; Buchet, Vincent; Cahu, Chantal; Coeurdacier, Jean-luc; Elie, Pierre; Gerard, André; Hussenot, Jerome; Legendre, Marc; Prou, Jean; Robert, Rene.
Les missions réalisées fin 2004 et début 2005 ont permis de faire le point sur les coopérations potentielles entre l'INSTM et l'IFREMER. Un certain nombre de domaines de coopération et de sujets de collaboration ont été identifiés et se sont traduits (ou se traduiront) par des actions de coopération (missions, stages, formations) soutenues financièrement par le SCAC de l'Ambassade de France à Tunis. La coopération entre l'IFREMER et l'INSTM dans le domaine de l'aquaculture a été très active dans le cadre du programme« Aquaculture 2001 » (1997-2001). Depuis cette période les relations se sont limitées à la préparation du programme DORAD qui était la suite d' «Aquaculture 2001 » . En l'absence du financement FSP sollicité pour DORAD, les deux organismes ont...
Tipo: Text
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00305/41648/40857.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

Performances de croissance de l'huître creuse, Crassostrea gigas (Thunberg) dans le bassin d'élevage de Marennes-Oléron entre 1979 &amp; 1982
Provedor de dados: 5
Autores: Berthome, Jean-paul; Prou, Jean; Bodoy, Alain.
Growth of the japanese oyster, Crassostrea gigas was monitored during 4 years, by following the recruitment of the year 1978, held in rearing conditions. After three and half years, the average length was la cm and the average total weight was 80 g. Clear seasonal changes were observed on the growth in length and weight.  An  important loss in dry weight occured in July, during the release of gametes. Such losses constituted 29 %, 43 % and 60 % of the dry weight, respectively for individuals which were 2 years, 3 years and 4 years old. The higher instantaneous growth rates  (G) were observed during spring and at the beginning of summer. Growth model of Von Bertalanffy, gave the best estimate for the length growth of the species. During the 1979-1982...
Tipo: Text
Palavras-chave: Growth parameter; Growth model; Reardd stock; Crassostrea gigas; Oyster; Growth; Descripteurs de croissance; Modèle de croissance; Stock cultivé; Crassostrea gigas; Huître; Croissance.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/publication-2967.pdf

Le partage de l'eau entre les différents utilisateurs : l'exemple des Pertuis Charentais
Provedor de dados: 5
Autores: Prou, Jean.
Managing the water resource finds a special dimension on the coastal strip. This resource is not shared between the different users according to the classical schemes of catchment areas, linking quality and quantity. The measure of a river water flow turns into currents in the marine field and the freshwater volumes turn into salinity units illustrating the fresh water / salt water mix. As a consequence, in a participative management approach as recommended by the GIZC (Integrated Management of the Coastal Zone) procedures, it seems fundamental that the actors from the terrestrial and marine worlds and their interfaces share their perceptions in order to improve the quality of the management scenarios. This shared perception of the catchment area and...
Tipo: Text
Palavras-chave: Charente Maritime; Pertuis charentais; Gestion eau; Conchyliculture.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/acte-3516.pdf

Combined effects of temperature-salinity on larval survival of the Eastern oyster Crassostrea virginica in the Maryland portion of the Chesapeak Bay (USA)
Provedor de dados: 5
Autores: Goulletquer, Philippe; Heral, Maurice; Prou, Jean.
Oyster landings in the Maryland portion of the Chesapeake Bay have declined by more than 50fold since the early part of the century, despite intensive management efforts. The annual shell repletion program is the most critical programmatic element to effect recovery of the ailing Eastern oyster Crassotrea virginica stock and fishery. The overall efficacy of shell repletion management depends primarily on the success of spat settlement on the planted shell, and furthermore on their survival rate. The Operations Research techniques and mathematical programming developed by Rothschild et al. (1991) attempt to maximize spat recruitment to the oyster stock subject to a series of operational constraints. Allocation and timing of shell deployment are the most...
Tipo: Text
Palavras-chave: Larval; Settlement; USA; Chesapeake Bay; Crassotrea virginica; Oysters.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-3074.pdf

Présélection de sites ostréicoles en pleine eau. Mise au point d'une maquette (version 0) et analyse critique. Application à la bande côtière des Pertuis Charentais
Provedor de dados: 5
Autores: Loubersac, Lionel; Guillaumont, Brigitte; Heral, Maurice; Prou, Jean; Durand, Henri.
Le présent document fait la synthèse et l'analyse critique d'une expérience préliminaire, de mise au point d'un outil et d'un produit d'aide à la décision, faisant appel aux technologies des Systèmes d'Information Géographique et visant la résolution d'un problème d'aménagement littoral. L'objectif fixé par ce travail est principalement, au travers de la réalisation d'une maquette, d'identifier les points d'ordre méthodologique qui demandent un effort de Recherche Développement. La présente étude a été conduite en partenariat entre le groupe transdirectionel SILLAGE de l'IFREMER, concepteur et architecte de la maquette du Système d'Information, et l'IFREMER DRV/RA (M. Héral et J. Prou) pour la validation scientifique du problème posé. Le groupe SILLAGE,...
Tipo: Text
Palavras-chave: Méthodologie; Ostréiculture; Système Informatique géographique; SIG; Modélisation.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00048/15906/13334.pdf

Rapport sur les causes des mortalités d'huîtres creuses observées en juin 1992 sur le Banc de Ronce Les Bains (Bassin de Marennes-Oléron)
Provedor de dados: 5
Autores: Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Galgani, Francois; Renault, Tristan; Bodoy, Alain; Garnier, Jacqueline; Geairon, Philippe; Chagot, Dominique; Grizel, Henri; Comps, Michel; Masson, Daniel; Noinin, Michel.
Dès le 4 JUIN 1992, un ostréiculteur digne de confiance avait signalé aux services d'IFREMER, une situation anormale sur le banc de Ronce les Bains. Un premier prélèvement a été effectué le jour même. En effet, ce secteur avait déjà été le lieu de mortalités d'huitres estimées à 7 000 tonnes, au printemps 1988, et s'est révélé par le passé comme étant un endroit sensible. Pour information, figure en annexe le rapport établi en 1988, à destination du Préfet de la Charente Maritime. Ces mortalités ayant rapidement pris de l'ampleur, un dépôt de plainte contre X a été effectué par la Section Régionale de la Conchyliculture. A la suite de quoi, les services d'IFREMER ont été requis par la Gendarmerie Nationale (Brigade de Marennes) le 10 juin 1992, pour...
Tipo: Text
Palavras-chave: Ostréiculture; Huîtres creuses; Crassostrea gigas; Mortalité; Banc de Ronce Les Bains; Bassin de Marennes Oléron.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00048/15899/13327.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

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

Difficulties in sampling for estimation of phytoplankton biomass in estuarine conditions : variabilities and precisions at different temporal scales in the case of the bay Marennes Oleron
Provedor de dados: 5
Autores: Heral, Maurice; Goulletquer, Philippe; Razet, Daniel; Prou, Jean; Ravail, Brigitte; Maestrini, Serge.
Different sampling strategies have been tested for estimation of phytoplanktonic biomasses in a bay submitted to estuarine conditions and high velocity of currents. Daily variations showed that for a precision of 5% of the daily mean, it is necessary to sample with a 1 hour and a half time scale. Systematic sampling appears to be more preceise than the random sampling. A sampling during 35 days at low tide and at high tide, during the phytoplanktonic bloom, showed the large variability between the days. A precision of 30% of the mean biomass of the month is obtained with a 8 days time scale. Comparison between tidal cycle sampling (10% of precision) with a punctual sample in the middle of the day did not show large differences. As the main variability is...
Tipo: Text
Palavras-chave: Marennes Oleron; Phytoplanktonic biomasses; Estimation.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-2877.pdf

Etude de la pollution bactérienne d'un chenal ostréicole : le chenal de Putet à La Tremblade - Influences respectives du tourisme et de la station d'épuration des eaux usées
Provedor de dados: 5
Autores: Prou, Jean; Faury, Nicole.
Some water samplings and bacteriological analyses carried out in the centre of the basin (pointe du Chapus) in 1979 (Heral and Prou 1980) show a good average water quality. In the summer, a pollution linked to tourist activities in the region shows an increase in the number of faecal coliforms.
Tipo: Text
Palavras-chave: Streptocoques; Coliformes; Bactériologie; Station épuration; Hydrologie; Ostréiculture; Pollution bactérienne.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/rapport-6302.PDF

Etude de la biomasse bactérienne dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean.
A seasonal study of total microflore shows that heterotrophic germs are submitted to a distinctive evolution in autumn and winter suspension and degradation of detritic material; in spring an summer bacterial growth due to degradation of phytoplanction. In summer enterocoques give evidence of positive summer pollution. Survival on the mud of Escherichia coli and overall of enterocoques indicates that the substration is particularly suitable to germ proliferation;
Tipo: Text
Palavras-chave: Marennes Oléron; Escherichia coli; Bactériologie; Biomasse.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/acte-3005.pdf

The French Polynesian experience
Provedor de dados: 5
Autores: Berthe, Franck; Prou, Jean.
French Polyncsia is currently the world's largest producer of cultured black pearls with exports worth US$150 millions annually. The activity has become of prime socio-economic importance the archipelagos with strong support and control of the government. In the mid-1980s, mass mortality of the black-lipped pearl oyster, Pinctada margaritifera, has occurred in several atolls and challenged the development of pearl farming activity. Consequent Studies and surveys have described severa! pathologica! conditions. None of those is considered to pose significant threat to the industry. However, they are monitored by a surveillance program in order to prevent and control emerging diseases. The governmemt of French Polynesia has developed efforts to maintain high...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00353/46396/46032.pdf

Estimation de la biomasse d'huîtres non cultivées dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Prou, Jean; Pouvreau, Stephane; Renaud, Vivian.
In the Marennes-Oléron oyster culture basin, the cultivated oyster stock shows an unbalanced age distribution: 25 000 to 30 000 tonnes are commercialized each year for a total cultivated biomass of 95 000 tonnes (1993). The biological overexploitation of the basin requires a reduction of the stock in order to get back to productivity rates that are compatible with the restrictions of the oyster market. This study gives an estimated natural deposit biomass of around 3 000 tonnes. An estimate of the abandoned and wild oyster biomass shows that 20 000 tonnes of these animals can be considered as competitors to cultivated oysters. [...].
Tipo: Text
Palavras-chave: Bassin Marennes Oléron; Echantillonnage; Estimation; Répartition spatiale; Typologie; Biomasse; Crassostrea gigas; Huîtres.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/rapport-4741.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

Pearl formation: Persistence of the graft during the entire process of biomineralization
Provedor de dados: 5
Autores: Arnaud, Sophie; Goyard, Emmanuel; Vonau, Vincent; Herbaut, C; Prou, Jean; Saulnier, Denis.
Most bivalves species of the genus Pinctada are well known throughout the world for production of white or black pearls of high commercial value. For cultured pearl production, a mantle allograft from a donor is implanted into the gonad of a recipient oyster, together with a small inorganic bead. Because of the dedifferentiation of cells during the first steps of the host oyster's immunological reaction, so far the fate of the graft and its exact role in the process of pearl formation could not be determined via classical histological methods. Here we report the first molecular evidence of the resilience of the graft in the recipient organism by showing that cells containing genome from the donor are still present at the end of pearl formation. These...
Tipo: Text
Palavras-chave: Genotype; Pearl; Pearl sac; Grafting; Biomineralization; Pearl oyster.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2456.pdf

Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France)
Provedor de dados: 5
Autores: Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that...
Tipo: Text
Palavras-chave: Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-3820.pdf

Effets d'enrichissements azotés sur la croissance des palourdes mises en élevage dans les claires du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Goulletquer, Philippe; Razet, Daniel; Prou, Jean; Garnier, Jacqueline; Taillade, Sylvie; Heral, Maurice; Peyre, R; Faivre, C.
Etant donné que la production de mollusques (palourdes ou huîtres) est limitée à 0,8 kg à 1 kg au m2 soit 40 à 50 palourdes adultes de 20 g au m2, il est intéressant d'essayer de forcer cette production en augmentant la production primaire qui est le facteur limitant de la production de palourdes. Cette production primaire dépend des apports en sels nutritifs en effet les travaux antérieurs de Zanette (1979), de Zanette et Garnier (1980), de Robert (1984) ont mis en évidence que les biomasses phytoplanctoniques ne peuvent dépasser un certain seuil à cause de l'épuisement progressif en sels nutritifs. Robert et al. (1984) ont mis en évidence, dans les claires de la Baie de Bourgneuf que l'azote est le premier facteur limitant de la croissance...
Tipo: Text
Ano: 1985
URL: http://archimer.ifremer.fr/doc/00389/50053/50641.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

Genetic structure at different spatial scales in the pearl oyster (Pinctada margaritifera cumingii) in French Polynesian lagoons: beware of sampling strategy and genetic patchiness
Provedor de dados: 5
Autores: Arnaud, Sophie; Vonau, Vincent; Rouxel, Catherine; Bonhomme, Francois; Prou, Jean; Goyard, Emmanuel; Boudry, Pierre.
In order to study further the genetic structure of the pearl oyster Pinctada margaritifera in French Polynesia with a special consideration for the sampling scale, we analyzed or re-analyzed sets of data based on nuclear DNA markers obtained at different spatial scales. At a large scale (several 1,000 km), the remote Marquesas Islands were confirmed to be significantly differentiated from Tuamotu-Gambier and Society archipelagos, with a marked difference however for the two main islands that are different from each other. At a medium scale (several 10 to several 100 km), overall homogeneity was observed within and between these two archipelagos, with some exceptions. This could be attributed both to large-scale larval dispersal and to human-driven spat...
Tipo: Text
Palavras-chave: Population genetics; Polynesia; Bivalve; Pearl oyster; Benthic organisms; Sampling strategy; Genetic patchiness.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4960.pdf

Programme Expérimental de Réhabilitation des Fossés à Poissons (1997-2000)
Provedor de dados: 5
Autores: Bel Hassen, Malika; Prou, Jean.
Cette étude s'inscrit dans le cadre du programme expérimental de réhabilitation des fossés à poisson initié au CREAA (1997-2000). Ce programme répond à une demande régionale pour la valorisation des fossés à poissons. Cet écosystème fait partie du patrimoine régional et marque surtout son identité culturelle, une volonté locale a été manifestée pour sa conservation et valorisation. Cependant l'aménagement de ces structures s'avère très coûteux, le grossissement de poissons, essentiellement l'anguille, a été prévu afin de justifier les frais d'aménagement. Par ailleurs, l'élevage extensif de poisson s'accompagne de la pratique d'autres activités telle que l'agriculture ou l'élevage. La cohabitation de ces différents types d' activités peut déstabiliser le...
Tipo: Text
Palavras-chave: Cartographie; Paramètre physico-chimique; Paramètres hydrologiques; Macrophystes; Halophytes; Taxonomie; Répartition géographique.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00086/19767/17409.pdf

Influence de la charge particulaire sur la filtration d'une population d'huître Crassostrea gigas dans le bassin estuarien de Marennes-Oléron (France) : analyse de deux cycle de marée
Provedor de dados: 5
Autores: Soletchnik, Patrick; Prou, Jean; Heral, Maurice; Barille, Laurent; Razet, Daniel; Guezennec, Loïc.
Filtration of oyster population (100 animals) have been followed during 16 days in raceway systems with continuous recorder of the input and output of the raceway for in situ turbidity and fluorescence. Experimental conditions were fluctuated with particulate matter which varied during a tidal cycle from 40 mg.l-1to 300 mg.l-1. During the same period the phytoplanktonic biomass presented synchronous variations form 7 to 20 µg.l-1 bound with sediment resuspension of phytobenthos and oyster biodeposit created by alternating currents. Filtration of oyster population during a neap tide cycle, variated between 1.2 and 2.8I.h-1 by animal for a calculated retention based on turbidity and between 2.4 and 4.8 l.h-1 by animal for a retention calculated with...
Tipo: Text
Palavras-chave: Marée; Charge particulaire; Marennes Oléron; Physiologie; Filtration; Crassostrea gigas; Huîtres.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-3059.pdf

Modeling Japanese oyster physiological processes under natural tidal variation in suspended particulate matter
Provedor de dados: 5
Autores: Barille, Laurent; Prou, Jean.
Feeding and growth of the Japanese oyster Crassostrea gigas is simulated by a deterministic model. However, physiological processes, estimated by statistical relationships, have not been tested under extreme environmental conditions such as high level of suspended particulate matter. Ecophysiological experiments were therefore conducted in situ in the Bay of Marennes-Oléron during a spring and neap tide cycle in May 1991, to get a better representation of 2 important components of the energy budget of the Japanese oyster: clearance rate and selection efficiency. The relationships previously established by Raillard et al. (1993) are re-evaluated by integrating the action of high seston load, typical of tidal effect within estuaries, on the physiological...
Tipo: Text
Palavras-chave: Tidal cycles; Oysters culture; Growth; Feeding; Energy budget; Ecophysiology.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/acte-3827.PDF

Rapport de mission au COP-Tahiti. 12 avril au 2 mai 1995
Provedor de dados: 5
Autores: Prou, Jean.
Cette mission fait suite à celle déjà effectuée en Avril 1994. Les premiers traitements des données hydrologiques de l'atoll de TAKAPOTO laissaient apparaître une variabilité faible du milieu tant au niveau spatial que temporel. Les résultats montraient cependant une variabilité intra-journalière non négligeable. Afin de mieux quantifier ces variations et d'offrir un support pour la modélisation, il apparut nécessaire d'utiliser une sonde multi-paramètres EMP 2000 de chez Applied Microsystems acquise en 1994 par l'Unité de Recherches Ecosystèmes Conchylicoles de la Station de La Tremblade. Cette sonde permet l'enregistrement simultané et en continu de différents paramètres tels que la hauteur d'eau, la température, la salinité, la turbidité, la lumière, la...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00164/27543/25706.pdf

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
Provedor de dados: 5
Autores: 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

Rapport d'Activité 2002
Provedor de dados: 5
Autores: Le Moine, Olivier; Soletchnik, Patrick; Robert, Stephane; Prou, Jean; Guilpain, Patrice; Geairon, Philippe; Razet, Daniel; Taillade, Sylvie.
Le Laboratoire Conchylicole de Poitou-Charentes (L.C.P.c.) de La Tremblade résulte du remaniement interne des laboratoires et unités de recherches au sein du Département Ressources Aquacoles qui s'est effectué en 1996 à l'IFREMER. Auparavant intégrée au laboratoire de Génétique· Aquaculture et Pathologie, l'Unité de Recherches Aquacoles en Poitou-Charentes (URAPC), créée en 1994, est devenue un laboratoire à palt entière dans son fonctionnement depuis 1996 et officialisé en 1998 pal' la définition des ses mandats. La compétence géographique assurée par le laboratoire dans ses fonctions concerne l'ensemble des Pertuis Charentais depuis le Sud-Vendée jusqu 'à l'embouchure de la Gironde. Ce rapport d'activité tient compte de ces faits et présente par ailleurs...
Tipo: Text
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00391/50266/50894.pdf

Characteristics of the particulate matter during the Mai '92 experiment. Effect on ecophysiological functions on mussel and oyster populations.
Provedor de dados: 5
Autores: Prou, Jean; Soletchnik, Patrick; Heral, Maurice; Geairon, Philippe; Razet, Daniel; Bougrier, Serge.
In order to complete the knowledge of seasonal variability of ecophysiological parameters, in situ experiment was conducted in May 1992 at the sampling site "Le Chapus". As in the previous experiments (May '91, October '91 and February '92), the race-way technique was used to study ecophysiological behavior of oyster and mussel populations submitted to natural variability.
Tipo: Text
Palavras-chave: Pacific cupped oyster; Crassotrea gigas; Particulate matter; Pigments; Particle size distribution; Retention; Filtration; Mytilus edulis.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00100/21091/18715.pdf

Gestion des ressources génétiques de l'huître perlière Pinctada margaritifera de Polynésie française : caractérisation génétique des populations et optimisation du recrutement pour l'exploitation perlière
Provedor de dados: 5
Autores: Arnaud, Sophie; Goyard, Emmanuel; Prou, Jean; Vonau, Vincent; Bonhomme, Francois; Boudry, Pierre.
Exploitation of the pearl oyster Pinetada margaritifera, which has developed in French Polynesia over the last twenty years, is based mainly on the collection of natural spat. Recruitment is highly variable in space and time and so spat is very often transferred by the farmers between atolls or even between archipelagos. In previous studies, anonymous nuclear markers demonstrated that This development has coincided with a genetic homogenisation of the wild stocks since the 1980s. This suggests a high level of reproductive success on farms, which is likely to be due to the high density of animaIs when compared to the density in the wild. We used the same markers to show that the level of genetic variability observed on farms is not significantly different...
Tipo: Text
Palavras-chave: French Polynesia; Genetic diversity; Spat; Pinctada margaritifera; Pearl oyster; Polynésie française; Diversité génétique; Naissain; Pinctada margaritifera; Huître perlière.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-3822.PDF

Les productions conchylicoles dans leur écosystème : les conditions de la réussite...les menaces à court et moyen terme
Provedor de dados: 5
Autores: Prou, Jean; Piquet, Jean-come; Goulletquer, Philippe; Mongruel, Remi; Ryckaert, Mireille.
La conchyliculture charentaise est une filière enracinée dans les écosystèmes de la Gironde et des Pertuis Charentais. Les interdépendances de la conchyliculture avec les autres usages présents sur ces territoires sont connues, anciennes et doivent être vues dans une perspective historique. Les concepts de biodiversité développés entre autres dans le Millenium Ecosystem Assessment permettent une lecture nouvelle de la place de la conchyliculture dans son environnement. Les différentes composantes de la biodiversité offrent des services écosystémiques qui permettent à l’homme de profiter de la consommation de coquillages. De la pêche pour sa subsistance à la conchyliculture, la consommation de coquillages oblige à une intervention dans les écosystèmes. Dans...
Tipo: Text
Palavras-chave: Conchyliculture; Ecosystème marin; Biodiversité; Nuisance; Cadmium; Algue toxique; Microbiologie.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12567/9435.pdf

Les ressources exploitées par la pêche et la conchyliculture
Provedor de dados: 5
Autores: Caill-milly, Nathalie; Morandeau, Gilles; Castege, Iker; Sanchez, Florence; Lissardy, Muriel; Chust, Guillem; Borja, Angel; Auby, Isabelle; Lapegue, Sylvie; Prou, Jean; Oger-jeanneret, Helene; Lassalle, Géraldine; Prevost, Etienne; Buoro, Mathieu; Lobry, Jérémy; De Pontual, Helene; De Casamajor, Marie-noelle; Biais, Gerard; D'Elbee, Jean.
L'exploitation des ressources par la pêche professionnelle et par la conchyliculture repose sur des ressources vivantes sauvages ou domestiquées qui sont présentes dans différents milieux aquatiques depuis les rivières jusqu'au large en mer. L'état de ces populations dépend non seulement des choix d'exploitation au regard des capacités de renouvellement des stocks mais aussi des caractéristiques environnementales qui impactent les différentes phases des cycles biologiques des espèces et jouent donc sur leur bon déroulement. Ces conditions du milieu sont tributaires pour partie des activités anthropiques (qualité et quantité d'eau disponible, obstacles au franchissement, autres perturbations) et peuvent être soumises aux effets du changement climatique. Ce...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55568/57180.pdf

Influence du cycle semi-dirune et vives-eaux mortes-eaux sur la disponibilité du matériel particulaire et son utilisation par une population de Mytilus edulis
Provedor de dados: 5
Autores: Prou, Jean; Barille, Laurent; Heral, Maurice; Ratiskol, Gilles; Soletchnik, Patrick; Bougrier, Serge; Razet, Daniel; Geairon, Philippe.
During a fortnightly tidal cycle, a Mytilus edulis population was submitted to natural food conditions in the bay of Marennes-Oléron. During 4 tidal cycles, in vivo continuous measurements of turbidity and fluorescence were recorded to study the evolution of Total Particulate Matter (TPM), phaeopigments and chlorophyll-a concentrations. Turbidity in the water column is clearly influenced by resuspension of sediment. Degradated cells of phytoplankton were associated with sediments, involving strong correlation between phaeopigments and turbidity. High values of chlorophyll-a were encountered during neap tides when turbidity was low. No relation with resuspension processes were observed.  No effect of fortnightly variability on retention was observed by...
Tipo: Text
Palavras-chave: Ancova; Utilisation du matériel particulaire; Mytilus edulis; Moules.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-3079.pdf

Rapport de mission Ifremer en Croatie - 8/12/1997 au 12/12/97
Provedor de dados: 5
Autores: Prou, Jean; Buestel, Dominique.
Cette mission était prévue dans le cadre de la coopération Franco-Croate qui a en particulier pour but d'intensifier les relations des deux parties en matière de conchyliculture dans la baie de Mali Ston. Ce programme reçoit le soutien financier du MAE via le CIES, Un premier objectif était de poursuivre les travaux concernant l'étude de l'écosystème conchylicole de la baie de Mali Ston par une campagne de mesures hydrobiologiques. Cependant des problèmes techniques n'ont pas permis l'envoi de la sonde de mesure et cette partie du travail a du être repoussée, la durée de la mission étant alors réduite, Le deuxième objectif était de vérifier l'intérêt et la faisabilité d'un voyage en Croatie de professionnels français de la conchyliculture en mars 1998, les...
Tipo: Text
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00391/50198/50822.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

Participatory case definition between stakeholders and implication for early detection: a case study of the oyster production in France
Provedor de dados: 5
Autores: Lupo, Coralie; Osta Amigo, Axel; Marce, Clara; Prou, Jean.
Aquatic animal health surveillance is notably based on the observation of any increased shellfish mortality by shellfish farmers and its immediate mandatory notification to the local competent authority. According to current EU regulation, increased mortality is defined using a participatory approach: case reporting is based on individual farmer perception, which then can be turned into notification in cooperation between the farmer and the competent authority. All the challenge relies on starting from individual perception and knowledge of increased mortality to a collective alert onset informing potential control actions having a community interest. We made an inventory of the criteria used by surveillance stakeholders to define and detect increased...
Tipo: Text
Palavras-chave: Aquatic animal surveillance; Mortality; Shellfish; Early warming surveillance; Case definition.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00195/30600/29057.pdf

Bassin de la Charente et Baie associée de Marennes-Oléron
Provedor de dados: 5
Autores: Bacher, Cedric; Fillon, Alain; Prou, Jean; Heral, Maurice.
Les modèles d'apports de nitrates par le fleuve Charente, les modèles de productivité de production primaire et les modèles de croissance des huîtres développés précédemment ont été adaptés pour préciser l'impact de la Charente en période d'étiage sur la productivité des huîtres. L'impact de la construction éventuelle du barrage de la Charente a été évalué en fonction de son dimensionnement et de ses modalités de gestion.
Tipo: Text
Palavras-chave: Bassin de Marennes-Oléron; Modélisation; Crassostrea gigas; Charente; Trézence.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00077/18796/16373.pdf

Aspects biométriques et biochimiques de la croissance de l'huître Crassostrea virginica en élevage suspendu à Solomons (Baie de Chesapeake)
Provedor de dados: 5
Autores: Goulletquer, Philippe; Prou, Jean; Heral, Maurice.
Growth and proximate biochemical composition of the American oyster Crassostrea virginica were studied in the Patuxent river (Maryland), located in the middle reach of the Chesapeake bay (U.S.A.). The effects of stocking densities and environmental variables (depth, temperature) were examined in 1989-1990 on oyster population by using off-bottom culture. No significant density effect was observed on the shell growth, which is described by using a seasonally oscillating function. In contrast, the meat growth and the proximate biochemical composition were bath affected by the stacking density and the depth location. The variability of the resulting effects was observed based on a seasonal trend. Different hypothesis mainly related tO environmental conditions...
Tipo: Text
Palavras-chave: USA; Chesapeake Bay; Oysters; Growth; Biochemical composition; Crassostrea virginica; Croissance; USA; Chesapeake Bay; Huîtres; Biochimie; Biométrie; Crassotrea virginica.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-3076.pdf

Essai de caractérisation hydrobiologique de 4 atolls perliers
Provedor de dados: 5
Autores: Prou, Jean.
At the end of the general research programme on nacre (PGRN; 1999) and the beginning of the second development contract (2001), an agreement between Ifremer and the French Polynesian Territory was set up to characterise four pearl-producing atolls. During the PGRN, a model on nacre growth was constructed based on data acquired on the pilot site at Takapoto, a closed atoll of the Tuamotu Archipelago. Since then, pearl cultivation has developed on 34 atolls and a network for monitoring growth has been implemented in several atolls. The variability of several hydrobiological parameters was addressed in four of these sites. These sites included Raietea, a high island; Manihi and Takaroa, both single-channel atolls; and Makemo, a two-channel atoll and quite...
Tipo: Text
Palavras-chave: Atolls; Polynésie Française; Paramètres hydrobiologiques.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/acte-3260.pdf

Variations des productions de biodépôts (feces et pesudofeces) de l'huître Crassostrea gigas dans un estuaire macrotidal : baie de Marennes-Oléron
Provedor de dados: 5
Autores: Razet, Daniel; Heral, Maurice; Prou, Jean; Legrand, Jacqueline; Sornin, Jean-marc.
The continuous obtention of current (speed and direction) turbidity and phytoplanktonic   fluorescence was achieved for 9 successive days during the month of May 1988. Each two hours, during the day, the faeces and pseudofaeces productions of 7 oysters have been sampled individualy. The filtration rate were calculated in continuous. It appeared that the concentration in particular matter and also the planktonic fluorescence fluctuated in direct relation with the water depth, the origin of the water masses and the speed of the wind. During the tidal cycle the mean filtration rate was constant which induced a food consumption largely variable. The oysters were always above the limit of pseudofaeces production which regulated the ingested quantity. Their...
Tipo: Text
Palavras-chave: Faeces; Pseudofaeces; Sort; Crassostrea gigas; Fèces; Psueofèces; Tri; Crassotrea gigas.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/publication-3031.pdf

Conditions d'apparition de densités accrues de dinoflagellés Dinophysis dans le pertuis d'Antioche et les eaux adjacentes. Campagnes Dinopertuis 89
Provedor de dados: 5
Autores: Delmas, Daniel; Herbland, Alain; Maestrini, Serge; Mornet, Francoise; Morand, Philippe; Spano, Anna-maria; Burgeot, Thierry; Margat, Sylvie; Charpentier, Gabriel; Fillon, Alain; Leguay, Didier; Thomas, Gerard; Bacher, Cedric; Heral, Maurice; Prou, Jean.
Environmental and species features which lead to increases in cell density of the D.S.P. Dinoflagellate Dinophysis in inshore and offshore waters of the île de Ré - île d'Oléron area, France (cruises "Dinopertuis89"). Four weekly sampling series have been carried out, within 10 May – 31 May 1989, at 24 stations located from inshore to offshore waters of the "île de Ré" - "île d’Oléron" area, with the aim to investigate (i) whether Dinophysis increases in cell density occur first in offshore waters and then, eventually, are pushed to the coast, or develop simultaneously in the whole area, and (ii) whether there are some environmental conditions which are related to Dinophysis blooms. Depths of sampling have been stated on the bas is of STD profiles. All...
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00174/28532/26916.pdf

Journées Conchylicoles IFREMER Centre de Nantes 12 et 13 mars 2003
Provedor de dados: 5
Autores: Prou, Jean; Conche, Nelly; Taillade, Sylvie.
Ce rapport synthétise les communications faites lors des "journées conchylicoles" sur les travaux scientifiques de l'Ifremer en soutien aux activités conchylicoles
Tipo: Text
Palavras-chave: Génétique; Immunologie; Pathologie; Physiologie; Ecophysiologie; Système d'élevage.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00200/31115/29526.pdf

Les outils géomatiques pour des applications de gestion du secteur ostréicole. CoastGIS'97
Provedor de dados: 5
Autores: Populus, Jacques; Loubersac, Lionel; Prou, Jean; Kerdreux, Michel; Le Moine, Olivier.
In Marennes-Oléron, Héral (1986) described the relationship between the annual production and the oysters' biomass over a century. His conclusion is that the drop in the growth of oysters was caused by an "overstorage" considering the trophic capacity of the basin. Moreover, the large intertidal spaces, though providing a great opportunity for mollusc culture, suffer from a large bio-deposition (Sornin 1983) which tends to intensify the sedimentation of the basin. The spatial management of oyster culture could be a key factor for its long-term development. In collaboration with the French Marine Affairs, in charge of the cadastral management, the IFREMER has developed a geographical information system enabling the gathering under the same geographic...
Tipo: Text
Palavras-chave: Bathymétrie; Cartographie; Modélisation; Conchyliculture; SIG; Système d'Informations Géographique.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3323.pdf

Modélisation de l'écosystème du bassin de Marennes-Oléron (rapport 1992)
Provedor de dados: 5
Autores: Raillard, Olivier; Soletchnik, Patrick; Heral, Maurice; Prou, Jean; Bougrier, Serge; Razet, Daniel; Geairon, Philippe; Barille, Laurent; Guezennec, Loïc.
Les expérimentations on continu sur le site du Chapus au centre du bassin de Marennes-Oléron pendant le mois de mai 1991 et d'octobre 1991 ont permis de préciser la filtration des huîtres en fonction de la variabilité de la charge particulaire. Ces nouveaux résultats permettent d'affiner les modèles de croissance des huîtres. Un nouveau modèle de croissance phytoplanctonique permet de démontrer la sensibilité du bassin de Marennes-Oléron aux apports de nitrates provenant de la Charente, et leur impact sur la croissance des huîtres. L'étude des caractéristiques mécaniques des vases et des biodépôts ainsi que l'étude de l'agitation (houle et clapots, permet de modifier et de préciser les formulations d'un nouveau modèle de transport particulaire représentant...
Tipo: Text
Palavras-chave: Séries en continu; Filtration; Crassostrea gigas; Modèle phytoplanctonique; Sédiment; Modèle de transport particulaire; Bassin de Marennes Oléron.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00048/15907/13335.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

History, Status, and Future of Oyster Culture in France
Provedor de dados: 5
Autores: Buestel, Dominique; Ropert, Michel; Prou, Jean; Goulletquer, Philippe.
The history of French oyster culture consists of a succession of developmental phases using different species, followed by collapses caused by diseases. The indigenous species Ostrea edulis was replaced first with Crassostrea angulata, then C. gigas. France is now the top producer and consumer of oysters in Europe, producing around 120,000 t of the cupped oyster C. gigas annually, and an additional 1500 t of the flat oyster O. edulis. Cupped oysters are produced all along the French coast from natural and hatchery spat. Various structures are used to collect spat from the wild. After a growing-on period, oysters are Cultivated by three main methods: (1) on-bottom culture in the intertidal zone or in deep water, (2) off-bottom culture in plastic mesh bags...
Tipo: Text
Palavras-chave: Cupped oyster; Flat oyster; Ostrea edulis; Crassostrea gigas; French production; Aquaculture.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7396.pdf

Modeling soft institutional change and the improvement of freshwater governance in the coastal zone
Provedor de dados: 5
Autores: Mongruel, Remi; Prou, Jean; Balle-beganton, Johanna; Lample, Michel; Vanhoutte Brunier, Alice; Rethoret, Harold; Perez Agundez, José A.; Vernier, Françoise; Bordenave, Paul; Bacher, Cedric.
The contribution of soft institutional change to improve freshwater governance in the coastal zone will be examined. Freshwater management seeks to reduce losses due to overexploitation of the common-pool resources provided by river catchments and their associated ecosystems. Due to the complexity of the governance system, improving the performance of one coastal social-ecological system means searching for the appropriate “soft” institutional change. In the Pertuis Charentais region, increasing scarcity of freshwater in summer threatens the health of the coastal ecosystem and the sustainability of human activities, which depend on the use of natural resources. The allocation of freshwater among competing uses or concerns is a core issue for integrated...
Tipo: Text
Palavras-chave: Common-pool resources; Ecosystem services; Freshwater management; Governance; Institutional arrangements.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00055/16665/14158.pdf

Rapport sur la situation zoosanitaire du cheptel Crassostrea gigas : cas du bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Grizel, Henri; Renault, Tristan; Cochennec, Nathalie; Tige, Gilbert; Audic, Guylaine; Pichot, Yves; Chollet, Bruno; Goulletquer, Philippe; Soletchnik, Patrick; Geairon, Philippe; Prou, Jean.
Le cheptel d'huîtres creuses, Crassostrea gigas, du Bassin de Marennes-Oléron a subi ces dernières années des morta lités (mai 88, mai 91, été 1992 et hiver 92-93). Les examens histopathologiques pratiqués durant celles-ci n'ont pas permis de déceler d'agents pathogènes. Les causes avaient été attribuées essentiellement, pour les premiers cas, à un manque de nourriture corrélé avec des conditions de sécheresse (donc un manque d'apport d'eau douce pour le bassin) et à des surcharges trop importantes des biomasses de fiItreurs, huîtres y compris. L'explication du dernier cas de mortalité survenue au cours de l'hiver serait d'un autre ordre: l'abaissement brutal des salinités, notamment dans les claires où étaient épurées soit des huîtres natives fragilisées,...
Tipo: Text
Palavras-chave: Etude zoosanitaire; Mortalité; Epidémiologie; Pathologie; Marennes Oléron.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00050/16152/13635.pdf

Système d'informatique géographique et conchyliculture : indices de productivité
Provedor de dados: 5
Autores: Prou, Jean; Heral, Maurice.
Geographical information systems collect and integrate geographically referenced data of diverse nature (database, model results, etc.). Comparing information from different sources can help formulate productivity indexes.
Tipo: Text
Palavras-chave: Conchyliculture; Système d'Information Géographique; SIG.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3257.pdf

Recruitment of mussels in the Pertuis Breston (France) in these last years. A preliminary analysis on the influence of temperature and sunshine
Provedor de dados: 5
Autores: Prou, Jean; Dardignac, Marie-jose.
Since 1979, the IFREMER Laboratory follows mussel recruitement in the Pertuis Breton. Gametogenesis generally begins in September or October and ends in Décember. Spawning may begin in Februrary and continues up ta the end of April, but it usually occurs in the second fortnigh of March. The most important settlement generaly runs after the middle of May up to the middle of June. Duririg the study period, four years are noticeable by lack of settlement : 1982, 1989, 1990 and 1991. This failure thraughout these three last years resulted in a breakdown of the cultivated biomass. The present paper outlines a preliminary analysis on the influence of temperature and sunshine.
Tipo: Text
Palavras-chave: Mussels; Recruitment; Temperature; Sunshine; Pertuis Breton.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00039/15064/12387.pdf

Feeding and absorption in Cerastoderma edule under environmental conditions in the Bay of Marennes-Oleron (Western France)
Provedor de dados: 5
Autores: Urrutia, Mb; Iglesias, Jip; Navarro, E; Prou, Jean.
Physiological processes involved in energy acquisition by the filter-feeding bivalve Cerastoderma edule (L.) (Mollusca: Bivalvia) were quantified under naturally fluctuating feeding conditions imposed by tidal cycles in the Bay of Marennes-Oleron. Physiological measurements were performed during two neap and two spring tidal cycles in order to cover a wide range of seston concentrations (TPM = 15-95 mg l super(-1)). The main effect exerted by tides on the food supply was the resuspension of bottom sediments of low organic content, leading to a strong 'dilution' of suspended organic matter. Although filtration rate was found to increase with seston concentration, ingestion rate was strictly regulated by means of pseudofaeces production. Selection...
Tipo: Text
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/publication-3837.PDF

Etude comparative de différents indices de condition chez l'huître creuse (Crassostrea gigas)
Provedor de dados: 5
Autores: Bodoy, Alain; Prou, Jean; Berthome, Jean-paul.
Among the different condition indices, some of them were compared on a population of the japanese oyster, Crassostrea gigas. The follow-up of experimental racks was performed monthly during four years. The use of dry weight in condition indices gave a more precise and more reliable representation for the condition of the oysters than the fresh weight. The sensitivity of these indices, which corresponds to their ability in revealing small changes in the physiological condition, was calculated for each indice. Those exhibiting the best sensitivity were ranked as follow: dry weight on the difference between total weight and shell weight, dry weight on intervalve volume. Other indices including the ratio between dry weight and various assessments of the volume...
Tipo: Text
Palavras-chave: Bivalve; Crassostrea gigas; Indice de qualité; Indice de condition; Crassostrea gigas; Bivalve; Condition factor; Condition index.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00000/2961/9155.pdf

Bilan des actions MOREST 2004 du Laboratoire Envrionnement et Ressources du Poitou-Charentes (LERPC)
Provedor de dados: 5
Autores: Soletchnik, Patrick; Le Moine, Olivier; Geairon, Philippe; Faury, Nicole; Razet, Daniel; Robert, Stephane; Prou, Jean.
The objectives for 2004: - Continuation of the study of the "on-bottom/off-bottom" mortality south of the Marennes Oléron Bay with a study of acute stress (sequel to Dynamo &amp; DynamoR studies) (WP 2.2.8). - Continuation of the laboratory analysis of the dynamoR 2003 samples (biological material) and data (WP 2.2.3). - Analysis of the data on the characterisation of summer mortality (WP 2.2.1) in relation to the environment. Through these tasks, the objectives are: (1) understanding the "on-bottom/off-bottom" mortality model of C. gigas in the Marennes Oléron Bay and underlining the environmental causes of summer mortality, (2) bringing a regional answer to this issue, (3) widening the study of the mortality / environment relationship to all the French...
Tipo: Text
Palavras-chave: Ecosystèmes conchylicoles; Modélisation; Bassin de Marennes Oléron; MOREST; Mortalités; Crassostrea gigas; Huîtres.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-3388.pdf

Etude de valorisation de base de données qualité des eaux dans le bassin de Marennes-Oléron et le bassin de La Charente
Provedor de dados: 5
Autores: Eaucea,; Prou, Jean.
L'objet de l'étude est de décrire les liens principaux entre l'hydrologie de la Charente et les constats qualitatifs dans le bassin de Marennes, ainsi que l'estimation des flux continentaux, sur la base des données des stations de Fontenelles et de Boyard entre 1977 et 2006. Du fait de l'influence de la marée, il n'est pas possible de mesurer les débits de la Charente dans sa partie aval. Ils ont donc été reconstitués à partir des stations de Saint-Savinien, du pont de Beillant, de Carillon, du Moulin de Chatre, de la Lijardière, de Jarnac, de Vindelle et de Foulpougne, en fonction de la disponibilité et de la fiabilité des données. Les mesures à Fontenelles et Boyard ont été réalisées de façon à disposer d'une gamme variée de situations par rapport au...
Tipo: Text
Palavras-chave: Hydrologie; Flux continentaux; Cycle de marée; Nitrates; Phosphates; Production primaire; Marennes Oléron; Charente.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00083/19419/17030.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

Rapport de mission Croatie. 13 juillet-27 juillet 1994
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean.
Objectif de la mission : Déterminer la faisabilité d'un programme bilatéral France-Croatie pour évaluer la capacité trophique de la baie de Mali-Ston pour l'élevage d'huîtres plates et de moules. Élaboration d'un  programme et acquisition sur le site des principaux paramètres physico-chimiques et trophiques de la baie de Mali-Ston.
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00389/50071/50664.pdf

Particle selection in the oyster Crassostrea gigas (Thunberg) studied by pigment HPLC analysis under natural food conditions
Provedor de dados: 5
Autores: Pastoureaud, Annie; Heral, Maurice; Prou, Jean; Razet, Daniel; Russu, Patricia.
Selective feeding in the adult oyster Crassostrea gigas was studied using natural particle assemblages in the estuarine environment of the Bassin de Marennes Oleron (France). Oysters were exposed to natural variations of suspended particulate matter by direct pumping of sea water from the bay during various tidal cycles. Experiments were conducted during the spring over both spring tides and neap tides, so as to obtain a maximum range of variation in seston characteristics, spring tide being characterized by very strong currents with high loads of resuspended materials (sediment, microphytobenthos and detritus). Particles were analysed for their chloropigment content by HPLC. The native pigments consisted exclusively of chlorophyll a and c, from both...
Tipo: Text
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1995/publication-3085.pdf

Première approche d'une méthode d'estimation prévisionnelle de la production potentielle d'huître creuse C. gigas d'élevage
Provedor de dados: 5
Autores: Berthome, Jean-paul; Prou, Jean; Razet, Daniel; Garnier, Jacqueline.
In this study~ various spat collectors, factory-made or hand-made are described. Recruiting valuation is realized by calculation of total surface of collectors (aerial photography and sampling method), with modulation by "catching ability" of the different types of collectors. Total mortality and growth are integrated into production valuation. It can be used to determine the relative fluctuations of commercial oyster production after a culture of three years long. In. Marennes-Oleron, the method is used in two test areas for three years with a great variability of catching between 1980 -81 -82.
Tipo: Text
Palavras-chave: Marennes Oleron basin; Production valuation; Spatfall; Crassostrea gigas; Bassin de Marennes Oléron; Evaluation de la production; Captage; Crassostrea gigas.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-2929.pdf

Budget énergétique de l'huître perlière, Pinctada margaritifera, dans le lagon de Takapoto
Provedor de dados: 5
Autores: Pouvreau, Stéphane; Tiapari, Jérôme; Gangnery, Aline; Garnier, M.; Lagarde, Franck; Robert, Stéphane; Jonquieres, Gerard; Teissier, Hinano; Prou, Jean; Bennett, Auguste; Caisey, Xavier; Haumani, Gaby; Buestel, Dominique; Bodoy, Alain.
Tipo: Text
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00041/15176/12513.pdf

Manque de naissain de moules pendant trois années consécutives dans les bouchots du Pertuis Breton. Observations préliminaires sur l'influence de la température et de l'ensoleillement
Provedor de dados: 5
Autores: Dardignac, Marie-jose; Prou, Jean.
Arnong the last ye3Is, three years are pointed out by paar mussei's recruitment in the Pertuis Breton. This lack leJds ta a Strong decrease of lhe cultivateà biamass. The influences of temperature and sunshine were studied. The lemperature daes nal seem ta be a very important faclor. On the other hand, awing ta the technicals used in the Pertuis Breton an important sunshine correlated with a spring tide during seed settlement on ropes appears ta be a maj or factor in spatfall suceess. This hypothesis is strenghened by the fact that, during the period of study no recruitment failure were observed on the off- shore long lines.
Tipo: Text
Palavras-chave: Reproduction; Moules; Recrutement; Captage; Pertuis Breton; Département Charente-Maritime.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00141/25189/23295.pdf

Les caractéristiques hydrologiques de l'atoll de Takapoto et sur la croissance de Pinctada margaritifera (huître perlière) en élevage.
Provedor de dados: 5
Autores: Prou, Jean; Geairon, Philippe; Bacher, Cedric.
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00389/50059/50647.pdf

Geomatics for the management of oyster culture leases and production
Provedor de dados: 5
Autores: Populus, Jacques; Loubersac, Lionel; Prou, Jean; Kerdreux, Michel; Le Moine, Olivier.
The coastal zone of Charente-Maritime in France has a leading position in oyster culture production. Yet it is being jeopardized by a number of problems such as overstocking, inadequate distribution of culture types, wild stock in excess, and strong siltation processes. Some of these problems result from a lack of communication and realization within the professional community, others due to obsolete management tools. The introduction of geomatics is believed to help provide some answers, besides alleviating the classical task of lease management. This chapter shows how the system was built, the spatial data geo-referenced and linked to administrative data. Examples of queries on the spatial data base reveal some otherwise invisible facts and allow...
Tipo: Text
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00172/28313/26594.pdf

Influence du temps d'immersion sur l'activité reproductrice et sur la croissance de la palourde japonaise Ruditapes philippinarum et l'huître japonaise Crassostrea gigas
Provedor de dados: 5
Autores: Goulletquer, Philippe; Lombas, Ines; Prou, Jean.
Pour étudier l'influence du temps d'immersion sur deux espèces cultivées, la palourde japonaise Ruditapes philippinarum et l'huître japonaise Crassostrea gigas, un suivi saisonnier de croissance est réalisé à 3 niveaux d'émersion (12%, 29% et 46%) sur l'estran du bassin de Marennes-Oléron. Des différences interspécifiques apparaissent : une prise de poids de coquille hivernale chez Crassostrea gigas, un arrêt étant observé en période automnale pour Ruditapes philippinarum. Par ailleurs l'émission des gamètes est plus précoce (août) et proportionnellement plus importante pour Crassostrea gigas que pour Ruditapes philippinarum (septembre). Les performances de croissance, la prise de poids ainsi que la distribution des populations des deux espèces sont...
Tipo: Text
Palavras-chave: Effort de reproduction; Temps d'immersion; Ruditapes philippinarum; Crassostrea gigas; Reproductive effort; Immersion time; Ruditapes phi Lippinarum; Crassostrea gigas.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00112/22374/20054.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

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

Bilan énergétique de l'huître japonaise Crassostrea gigas en conditions expérimentales de laboratoire au cours du mois de septembre 1991
Provedor de dados: 5
Autores: Soletchnik, Patrick; Bougrier, Serge; Razet, Daniel; Geairon, Philippe; Prou, Jean; Heral, Maurice; Barille, Laurent.
L'étude ci dessous, réalisée chez Crassostrea gigas, a comme objectif de comparer l'effet de différents types d'aliments sur le bilan énergétique de cette espèce.
Tipo: Text
Palavras-chave: Huître creuse; Crassostrea gigas; Bilan énergétique; Sources alimentaires; Biodépots; Tri pré-ingestif.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00100/21095/18720.pdf

Rapport de mission Croatie. 26 novembre-29 novembre 1996
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean.
Tipo: Text
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00389/50085/50677.pdf

An example of GIS potentiality for coastal zone management: preselection of submerged oyster culture areas near Marennes-Oleron (France)
Provedor de dados: 5
Autores: Durand, H.; Guillaumont, Brigitte; Loarer, Ronan; Loubersac, Lionel; Heral, Maurice; Prou, Jean.
The Charente Maritime coast, in central western France, is the most important area for oyster and mussel production in Europe. High density, in this restricted intertidal area, induces low growing rate and socio-economic difficulties. One of the possible solutions is to shift some oysters from intertidal area to submerged areas. Bathymetry, sedimentology, hydrodynamism, fisheries and administrative rules are some conditions which are considered to establish the better selection of potential zone. The successive steps of setting up the prototype of GIS are presented: digitized traditional data from charts, extracted data from grid models (hydrodynmaic model), merging of thematic covers, proposal of favorable areas. The results are discussed especially on...
Tipo: Text
Palavras-chave: GIS; Modelisation; Bathymetry; Sedimentology; Hydrodynamism; Marennes Oleron.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00017/12784/9725.pdf

The French mussel industry : present status and perspectives
Provedor de dados: 5
Autores: Prou, Jean; Goulletquer, Philippe.
The French mussel industry produces around 60,000 metric tons on a yearly basis using two common species: Mytilus edulis, which is widely distributed along the Atlantic coastline, and Mytilus galloprovincialis, distributed mainly on Mediterranean shores. This production represents only half of the yearly consumption of mussels in France, leading to large imports from Spain and the Netherlands. Most imports occur between September and March, when the Atlantic production is reduced because of low meat quality due to spawning events. Although a public mussel fishery still exists, most production is based upon 3 culture techniques: on-bottom culture, longline and suspended culture, and bouchot-type culture, with the latter being developed in the l3lh century....
Tipo: Text
Palavras-chave: Mussel; On bottom culture; Suspended culture; Longline culture; French; Production; Mytilus galloprovincialis; Mytilus edulis.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-2802.pdf

Compte-rendu de mission en Tunisie (14-20 Décembre 2006). Conchyliculture sur filière INSTM-IFREMER
Provedor de dados: 5
Autores: Prou, Jean.
Chargé de la Coopération avec l'INSTM sur un projet de développement de filières, trois points ont été développés lors de cette mission : l'état d'avancement du projet, la participation de l'INSTM, les actions à mettre en oeuvre dans le cadre de la coopération IFREMER-INSTM.
Tipo: Text
Palavras-chave: Conchyliculture; Filières; Captage; Croissance; Rendement; Recommandation; Tunisie.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00105/21670/19249.pdf

Interface between French Shellfish Industry and Research
Provedor de dados: 5
Autores: Prou, Jean; Goulletquer, Philippe; Heral, Maurice.
Historically, research involvement in shellfish industry appeared as soon as the 19th century with studies on oyster sanitary quality and nutritive values. Those aspects were developed to satisfy consumer's demand and public health issues. Later on, rearing technologies were developed to ensure optimization of the characteristics of shellfish population dynamic such as recruitment, growth, and mortality. In a third step, management of leasing grounds allocation required studies on ecosystems' functioning. It integrated over space and time relationships between environment (as a trophic resource) and shellfish production. Presently, new challenges regarding environmental protection and consumer's satisfaction have involved studies on optimized uses of...
Tipo: Text
Palavras-chave: Zoosanitary issues; Seawater quality; Space allocation; Shellfish research; Shellfish industry.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-6252.pdf

Comment améliorer la précocité de l'alerte en conchyliculture ? Exemple des mortalités de moules en 2014 dans les Pertuis Charentais
Provedor de dados: 5
Autores: Lupo, Coralie; Prou, Jean.
Surveillance of shellf ish health is based on clinical surveillance of shellfish mortality, including a detection phase and a mandatory notification phase. While control measures are limited, early detection of pathogens is a challenge which needs to be met. The relevance and feasibility of an enhanced clinical surveillance based on phone interviews were studied. The results made it possible to reconstruct the spatial and temporal evolution of the outbreaks of mussel mortality which occurred in Pertuis Charentais in 2014. Moreover, a qualitative analysis of the interviews revealed contextual elements that were used to enhance the previous description and to devise causal scenarios which could be used as research hypotheses. By incorporating the...
Tipo: Text
Palavras-chave: Coquillages; Moules; Investigation épidémiologique; Perception; Alerte précoce; Surveillance événementielle renforcée; Shellfish; Mussels; Epidemiological investigation; Perception; Early warning; Enhanced clinical surveillance.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00270/38091/36237.pdf

Ecophysiologie in situ de l'huître Crassostrea gigas dans un milieu macrotidal (bassin de Marennes-Oléron - Chapus 1991)
Provedor de dados: 5
Autores: Guezennec, Loic; Prou, Jean; Heral, Maurice; Razet, Daniel; Bougrier, Serge; Soletchnik, Patrick.
L'expérience menée lors du stage fait suite à deux expériences similaires menées en 1988 et 1990. Elle vise à étudier le comportement d'une population d'huîtres (100 individus) soumise aux variations du milieu naturel. La durée de l'expérience (3 semaines) permet de tester les effets simultanés des cycles haute mer. basse mer et celui des vives·eaux. mortes-eaux. De plus. les données acquises en continu sur le milieu (fluorescence et turbidité. salinité. température) permettront le calage des modèles courantologiques et sédimentologiques. Le choix du mois de mai pour l'expérience est déterminé par l'apparition. en général. d'un bloom phytoplanctonique à cette période de l'année. Les expériences précédentes (1988 et 1990) ont permis déjà d'appréhender la...
Tipo: Text
Palavras-chave: Ecophysiologie; Huître creuse; Crassostrea gigas; Bassin de Marennes-Oléron; Chapus; Charente Maritime.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00102/21308/18921.pdf

Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analysis of two comprehensive surveys in Marennes-Oleron bay (France)
Provedor de dados: 5
Autores: Guarini, Jean-marc; Blanchard, Fabian; Bacher, Cedric; Gros, Philippe; Riera, P; Richard, P; Gouleau, D; Galois, R; Prou, Jean; Sauriau, Pg.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chi a m(-2)) than in January (ca 85 mg chi a m(-2)). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account or this result, we suggest that...
Tipo: Text
Palavras-chave: Microphytobenthos; Chlorophyll a; Spatial distribution; Geostatistics; Intertidal mudflat.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00447/55852/58117.pdf

Du bassin versant au territoire maritime : la ressource hydrique objet d'une recherche intégrée et finalisée. L'exemple du bassin versant de la Charente et de la "Mer des Pertuis"
Provedor de dados: 5
Autores: Delmas, François; Heral, Maurice; Laplana, Ramon; Loubersac, Lionel; Prou, Jean.
Parmi les régions Ouest Européennes, la région Poitou Charentes se caractérise dans sa dimension économique par la présence d'activités où les cultures marines, l'agriculture et le tourisme occupent une place prédominante. Cette identité, partagée par d' autres régions, notamment atlantiques, s'appuie sur l'exploitation de la ressource hydrique et implique de plus en plus des critères de haute qualité tant vis à vis des produits finis agricoles, conchylicoles, touristiques que vis à vis de l'environnement, des paysages et des eaux. Sur cet ensemble de points la Région est dotée d'atouts indiscutables. Cependant les contraintes liées à la disponibilité de la ressource hydrique continentale comme marine et à son maintien à un bon niveau de qualité, font...
Tipo: Text
Palavras-chave: Conchyliculture; Agriculture; Charente; Marennes Oléron; Transfert eau; Modèle trophique; Gestion eau.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00018/12933/9898.pdf

Modelisation of oyster shell growth at 3 stations in the Patuxent river (Chesapeake Bay)
Provedor de dados: 5
Autores: Prou, Jean; Goulletquer, Philippe; Bacher, Cedric.
In oyster production area the determination of the stock, estimation of mortality and growth rates are determinant for knowledge of the fishery. Growth models can be used to predict the time to reach marketable size (76 mm in Chesapeake Bay). They are also important in term of management, when they can predict the future value of the stock (Askew, 1978). Oyster growth models can be built by analysing growth of natural oysters but absolute age is orten unknown. Many authors report growth data in Chesapeake Bay for suspended oyster culture. Unfortunalely, modelisation of the growth was not developed. In that study oyster, shell growth models have been established at three stations in the Patuxent river. Seasonal eITects on growth were integrated in the model
Tipo: Text
Palavras-chave: Modelisation; Oysters; Crassostrea virginica; Growth; Chesapeake Bay.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00200/31109/29512.pdf

L'élevage conchylicole sur filière : revue bibliographique
Provedor de dados: 5
Autores: Robert, Stephane; Prou, Jean; Le Moine, Olivier; Taillade, Sylvie.
La revue bibliographie de l'élevage conchylicole sur filière permet de situer l'évolution de cette technique en France et dans le monde. Elle regroupe les travaux disponibles tant sur les méthodes et les techniques, que sur les contraintes biologiques et environnementales qui conditionnent ce type d'élevage. Les techniques d'élevage conchylicole sur filières sont directement dépendantes de l' environnement disponible. Si l'élevage sur filière de surface nécessite des zones protégées peu disponibles sur le littoral atlantique, la filière de sub-surface correspond mieux aux possibilités de développement en site semi-abrité tels que les Pertuis charentais. L'élevage en filières immergées permet d'envisager la recherche de nouveau espace en mer ouverte comme...
Tipo: Text
Palavras-chave: Algue toxique; Bioaccumulation; Capacité trophique; Compétiteur; Densité élevge; Elevage en suspendu; Filière; Eutrophisation; Génétique; Matière particulaire; Mer ouverte; Mortalité; Phytoplancton; Pollution; Production primarie; Technique élevage; Transfert de biotope.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00074/18510/16050.pdf

The French Polynesian experience (Pearl oyster management, a manual)
Provedor de dados: 5
Autores: Berthe, Franck; Prou, Jean.
French Polynesia is currently the world's largest producer of cultured black pearls with exports worth U5$150 millions annually. The activity has become of prime socioeconomic importance the archipelagos with strong support and control of the government. In the mid-1980s, mass mortality of the black-lipped pearl oyster, Pinctada margarltlfera, has occurred in several atolls and challenged the development of pearl farming activity. Consequent studies and surveys have described several pathological conditions. None of those is considered to pose significant threat to the industry. However, they are monitored by a surveillance program in order to prevent and control emerging diseases. The government of French Polynesia has developed efforts to maintain high...
Tipo: Text
Palavras-chave: Health management; Pinctada margaritifera; French Polynesia; Pathogens; Mass mortality.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3703.PDF

Evolution temporelle de la composition de la colonne d'eau pendant un cycle vives eaux- mortes eaux
Provedor de dados: 5
Autores: Prou, Jean.
Premier bassin ostréicole français, Marennes-Oléron est un écosystème complexe dont la compréhension nécessite la mise en place d'études multidisciplinaires intégrées. L'IFREMER y développe depuis 1985 un programme de recherche axé sur la connaissance des écosystèmes aquacoles. L'Unité de Recherche des Ecosystèmes Aquacoles (DRV/RA/UREA), basée à La Tremblade est le principal support de ce programme. [Extrait introduction]
Tipo: Text
Palavras-chave: Charente Maritime; Marennes Oléron; Modèle mathématique; Matière suspension; Courantologie; Marée; Echantillonnage; Variation temporelle; Colonne eau.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/rapport-3844.pdf

A propos des problèmes de captage de naissain de moules (Mytilus edulis L.) dans le Pertuis Breton de 1989 à 1991 : observations préliminaires
Provedor de dados: 5
Autores: Dardignac, Marie-jose; Prou, Jean.
A retrospective study has been carried out on the possible relationships between the spat recruitment of mussels from the Pertuis Breton (France) and some environmental factors at different periods of the year. A significant negative correlation between recruitment and temperature has been found at two periods of the reproductive cycle; the first one coinciding with gametogenesis and the second one taking place just before spawning. But, no relation was noticed with temperature or salinity during the plantonic stage. These results are discussed. An interesting relationship was found between recruitment and "E.T.P.", an index expressing the drying power of air, taking into account temperature, wind, sunshine and moistness. Dessication appears to be...
Tipo: Text
Palavras-chave: Charente Maritime; Pertuis Breton; ETP; Salinité; Température; Estimation biomasse; Mytilus edulis; Moules; Captage.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/publication-3826.PDF

Diversification de la production : culture de palourdes sur estran, résultats années 84-85
Provedor de dados: 5
Autores: Goulletquer, Philippe; Prou, Jean; Heral, Maurice.
Following the development of net protection techniques (1980), Japanese clam Ruditapes philippinarum farms develop in the ponds of Charente-Maritime. The county production for 1984 is about 100 tonnes, for a turnover of 4.5 Million Francs. To this day, farmers cultivating clams in ponds over a full cycle get better growth results during the first year. The size of 24 mm is obtained with a density of 200 individuals per square metre. However, due to the type of water input in ponds and to the limited primary production developing in the latter, it appears that biomasses in farms during the second year should not be greater than 0.5 to 1 kg per m² (30 to 50 clams per m²). Thus, the development of clam culture in marsh areas comes to a halt, as farmers are...
Tipo: Text
Palavras-chave: Marennes Oléron; Mortalité; Biomasse; Croissance pondérale; Croissance linéaire; Biométrie; Elevage; Ruditapes philippinarum; Palourdes.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/rapport-3840.PDF

Rapport d'activité 2002 du Laboratoire Conchylicole de Poitou-Charentes de La Tremblade
Provedor de dados: 5
Autores: Le Moine, Olivier; Soletchnik, Patrick; Robert, Stephane; Prou, Jean; Guilpain, Patrice; Geairon, Philippe; Razet, Daniel.
La compétence géographique assurée par le laboratoire dans ses fonctions concerne l'ensemble des Pertuis Charentais depuis le Sud-Vendée jusqu'à l'embouchure de la Gironde. Ce rapport d'activité tient compte de ces faits et présente par ailleurs les programmes de recherche selon la nomenclature établie dans le cadre du Plan Stratégique de l' IFREMER, des grands défis et dans la définition des mandats de laboratoires.
Tipo: Text
Palavras-chave: Rapport activité; Réseaux surveillance; Bactériologie; Microbiologie; REMORA; REMOULA; Ecosystème conchylicole; Modélisation; Marennes Oléron.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00074/18555/16106.pdf

Modélisation de l'écosystème du bassin de Marennes-Oléron (Rapport 1991)
Provedor de dados: 5
Autores: Raillard, Olivier; Razet, Daniel; Prou, Jean; Heral, Maurice.
Les expérimentations en continu sur le site du Chapus au centre du bassin de Marennes-Oléron pendant le mois de mai 1990 ont permis de déterminer le comportement des huîtres (filtration et ingestion). Dans le bassin de Marennes-Oléron les huîtres sont toujours au-dessus du seuil de production de pseudofeces qui régulent la qualité de nourriture ingérée. Ces résultats démontrent par ailleurs qu'il existe nettement un tri du matériel particulaire en suspension. Les huîtres rejettent préférentiellement le matériel minéral dans les pseudofeces alors que le matériel qui transite dans le tractus digestif est enrichi en matière organique. Un modèle trophique des huîtres a ainsi pu être établi avec de nouvelles lois de tri de la matière particulaire. Parallèlement...
Tipo: Text
Palavras-chave: Séries en continu; Turbidité; Phytoplancton; Physiologie huître Crassostrea gigas; Modèle de croissance; Modèle de remise en suspension.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00095/20635/18266.pdf

Gestion des bassins conchylicoles
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean; Sauriau, Pierre-guy; Goulletquer, Philippe.
The excess of farmed mollusc biomass in some French shellfish-farming basins (Marennes-Oléron basin, Isle of Ré, Isle of Bourgneuf) has been clearly highlighted. This manifests itself as a decrease of growth consistency of the molluscs and an increase in chronic mortality rates not linked to pathogenic agents. To this excess of farmed biomass are added the biomass of oysters or "wild" mussels or biomass linked to abandoned concessions.
Tipo: Text
Palavras-chave: Estimation; Croissance; Biomasse; Conchylicultre.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/acte-3084.pdf

Effect of the density of the culture and the depth on the seasonal variation of the biochemical composition of Crassostrea virginica in patuxent river (Chesapeake Bay)
Provedor de dados: 5
Autores: Prou, Jean; Heral, Maurice; Goulletquer, Philippe; Forget, Maïté; Bougrier, Serge; Razet, Daniel.
The project of cultivation of oyster has been designed to evaluate the growth rate, the mortality, the reproductive effort, production and biochemical composition of the oyster function of the density and the depth. This plan was intended: - to build model of growth rate, - to demonstrate the action of the different parameters on growth rate (temperature, food effect...), - to evaluate the density effect to see if the available food could be a limiting factor, - to estimate the effect of the depth joined to the impact of the high turbidity near the bot tom, - to detect the mortality related to the prevalence of diseases.   The project began in July 1989 by dredging 20 000 small oysters at the mouth of the Patuxent River near Cove Point. Three experimental...
Tipo: Text
Palavras-chave: Physiology; Seasonal variation; Biochemical composition; Density; Crassostrea virginica; Cheseapeake Bay.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00200/31104/29503.pdf

Retention efficiency in oyster Crassostrea gigas exposed to variable food quantity and quality
Provedor de dados: 5
Autores: Barille, Laurent; Prou, Jean; Heral, Maurice; Bougrier, Serge.
Relative retention efficiency (Er%) of Crassostrea gigas was estimated in the laboratory with 7 diets consisting of algae and silt. Total particulates varied from 1.34 mg/l in natural sea water to 27.65 mg/l in natural sea water enriched with silt. It was also calculated from field experiment to get high concentration of seston up to 66 mg/l. It appeared that Crassostrea gigas did not adjust its retention according to the food quality and the gill porosity was controlled by the concentration of particulate matter. In low seston load (1.34 mg/l) the oyster showed no change in retention for particles larger than 3-4 µm (Equivalent Spherical Diameter, ESD) but at the highest concentration (66 mg/l) it could only retain with a maximum efficiency particles...
Tipo: Text
Palavras-chave: Crassostrea gigas; Dietary quality; Particle concentration; Physiological model; Retention efficiency.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00100/21096/18721.pdf