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Registros recuperados: 92
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A methology for the stocks assessments of cultivated oysters among along the French Atlantic coasts ArchiMer
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
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A propos des problèmes de captage de naissain de moules (Mytilus edulis L.) dans le Pertuis Breton de 1989 à 1991 : observations préliminaires ArchiMer
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
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Acquisition de donnée en continu sur la matière particulaire de la Baie estuarienne de Marennes-Oléron pendant le bloom printaniter planctonique : effet sur le taux de filtration de l'huître Crassostrea gigas ArchiMer
Heral, Maurice; Razet, Daniel; Prou, Jean.
The continuous obtention of different signals has been achieved for 9 days at a -fixed station during May 1988. The speed and direction of the currents have been monitoring concurrently with "in situ" turbidity and fluorescence in relation with the meteorological conditions. The concentration in particulate matter and the planktonic fluorescence fluctuated in direct relation with the water depth, the speed of the current and with the origin of the water masses. The oysters submitted to these large fluctuated conditions showed not constant filtration rate. The filtration calculated by turbidimeters (2 1 h-l g-1 dry weight) was three time less than the one achieved with fluorimeters (61 h-l g-1 dry weight). The filtration rate were fluctuated but not in...
Tipo: Text Palavras-chave: France; Marennes Oleron bay; Acquirring of continous data; Filtration; Crassostrea gigas; Particular matter; Marennes Oléron; Aquisition données; Courantologie; Filtration; Crassostrea gigas; Matière particulaire.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-3021.pdf
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Amélioration de l'évaluation des stocks de mollusques cultivés en Charente- Maritime ArchiMer
Bacher, Cedric; Deslous-paoli, Jean-marc; Heral, Maurice; Prou, Jean.
The expansion of shellfish culture businesses (oysters, mussels, clams...) gives way to a competition for the use of limited food resources, especially in the Marennes-Oléron basin where water circulation is slow. Increasing the amount of cultivated molluscs leads, from a biological point of view, to:- a drop in growth performances- a rise in chronic mortalities, higher and higher, due to a weakness in the physiological state with a lack of stocks which would have compensated the habitat seasonal shortages (end of winter, etc...)- a greater weakness to diseases, linked to a deficient physiological state and a density rise which increases the proximity rate and thus, parasite propagation speed.For these primary reasons, and for the future of oyster culture,...
Tipo: Text Palavras-chave: Modélisation; Estimation; Echantillonnage; Mollusques; Marennes Oléron; Evaluation stocks.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-3841.PDF
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An example of GIS potentiality for coastal zone management: preselection of submerged oyster culture areas near Marennes-Oleron (France) ArchiMer
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
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Approche de la capacité trophique d'un écosystème conchylicole ArchiMer
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
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Aspects biométriques et biochimiques de la croissance de l'huître Crassostrea virginica en élevage suspendu à Solomons (Baie de Chesapeake) ArchiMer
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
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Bassin de la Charente et Baie associée de Marennes-Oléron ArchiMer
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
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Bilan des actions MOREST 2004 du Laboratoire Envrionnement et Ressources du Poitou-Charentes (LERPC) ArchiMer
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 & 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
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Bilan énergétique de l'huître japonaise Crassostrea gigas en conditions expérimentales de laboratoire au cours du mois de septembre 1991 ArchiMer
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
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Budget énergétique de l'huître perlière, Pinctada margaritifera, dans le lagon de Takapoto ArchiMer
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
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Characteristics of the particulate matter during the Mai '92 experiment. Effect on ecophysiological functions on mussel and oyster populations. ArchiMer
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
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Combined effects of temperature-salinity on larval survival of the Eastern oyster Crassostrea virginica in the Maryland portion of the Chesapeak Bay (USA) ArchiMer
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
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Comment améliorer la précocité de l'alerte en conchyliculture ? Exemple des mortalités de moules en 2014 dans les Pertuis Charentais ArchiMer
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
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Compte-rendu de mission en Tunisie (13-17 Juin 2005). Atelier de travail sur les nouvelles perspectives de la recherche scientifique en aquaculture ArchiMer
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
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Compte-rendu de mission en Tunisie (14-20 Décembre 2006). Conchyliculture sur filière INSTM-IFREMER ArchiMer
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
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Conditions d'apparition de densités accrues de dinoflagellés Dinophysis dans le pertuis d'Antioche et les eaux adjacentes. Campagnes Dinopertuis 89 ArchiMer
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...
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Ano: 1990 URL: http://archimer.ifremer.fr/doc/00174/28532/26916.pdf
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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 ArchiMer
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
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Diversification de la production : culture de palourdes sur estran, résultats années 84-85 ArchiMer
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
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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" ArchiMer
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
Registros recuperados: 92
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