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Registros recuperados: 81
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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 single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems ArchiMer
Alunno-bruscia, Marianne; Bourles, Yves; Maurer, Daniele; Robert, Stephane; Mazurie, Joseph; Gangnery, Aline; Goulletquer, Philippe; Pouvreau, Stephane.
Many studies based on bioenergetics growth models have investigated the effects of environmental factors on oyster (Crassostrea gigas) growth and physiology. However, most of these models are site-specific and cannot be applied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a generic growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourlès et al. 2009) for the stimulation of C. gigas growth in different cohorts (spats and adults) at major shellfish culture sites in France, in several years: Arcachon (1993–1994); Marennes-Oléron (2007); Quiberon (1999, 2000, 2001); Rade de Brest (2008); Baie du...
Tipo: Text Palavras-chave: DEB theory; Modelling; Bivalves; Crassostrea gigas; Phytoplankton; Temperature effect; Coastal environment..
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15403/12762.pdf
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Approche des relations entre a croissance de l'huître Crassostrea gigas et le milieu dans le bassin d'Arcachon ArchiMer
Maurer, Daniele.
study of the experimental growth of the oyster Crassostrea gigas was undertaken of 1985 to 1988, parallel to a follow-up hydrobiologic of the medium, in three sites of the basin of Arcachon. - The characteristics of growth of the studied sites proved very stable during various years ; they are also very different from one site to another, the performances being able to vary the simple one with the double of the center of the basin towards the exit on the ocean. It is during the summer and of the autumn that the difference is established between the sectors, the spring growths being similar. The hierarchy observed is associated a more or less great precocity of the laying. - A gradient influences continental oceanic-influence is observed, resulting in more...
Tipo: Text Palavras-chave: Ostreiculture; Oyster; Hydrobiology; Growth; Bay of Arcachon; Crassostrea gigas; Ostréiculture; Huître; Hydrobiologie; Croissance; Baie d'Arcachon; Crassostrea gigas.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-1645.pdf
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Assessment and interpretation of temporal or spactial differences in shellfish productivity of typical French ecosystems ArchiMer
Mazurie, Joseph; Soletchnik, Patrick; Ropert, Michel; Fleury, Pierre-gildas; Auby, Isabelle; Maurer, Daniele; Bacher, Cedric.
Monitoring of Crassostrea gigas performances, from two year-classes, during 12 years, in various French shellfish farming areas have revealed great inter-annual and inter-sites differences in reproduction, growth, mortality or quality of oysters (meat content, Polydora infestation...). The presentation attempts to highlight how a comparative analysis of existing temporal or spatial data on molluscs, water quality, geography or meteorogoly may help to better understand and manage shellfish ecosystems. The range of hydrobiological conditions (food availability, turbidity, temperature...) recorded at national, pluriannual scale, in relation to shellfish performances, enlarges the base of such relationship. However, undirect causative factors, either natural...
Tipo: Text Palavras-chave: Climatic modulation; Hydro geography; Reproduction; Growth; Spatial differences; Water quality; Mortality; Shellfish productivity.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3318.pdf
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Bilan 2015 du dispositif national de surveillance de la santé des mollusques marins ArchiMer
Lupo, Coralie; Osta Amigo, Axel; Fleury, Elodie; Robert, Stephane; Garcia, Celine; Arzul, Isabelle; Baillon, Laury; Bechemin, Christian; Canier, Lydie; Chollet, Bruno; Dechamps, Lucie; Dubreuil, Christine; Faury, Nicole; Francois, Cyrille; Godfrin, Yoann; Lapegue, Sylvie; Morga, Benjamin; Travers, Marie-agnes; Tourbiez, Delphine; Masson, Jean-claude; Verin, Francoise; Cordier, Remy; Gangnery, Aline; Louis, Wilfried; Mary, Charlotte; Normand, Julien; Penot, Julia; Cheve, Julien; Dagault, Francoise; Le Jolivet, Aurore; Le Gal, Dominique; Lebrun, Luc; Bellec, Gwenael; Bouget, Jean-francois; Cochennec-laureau, Nathalie; Palvadeau, Hubert; Grizon, James; Chabirand, Jean-michel; Pepin, Jean-francois; Seugnet, Jean-luc; D'Amico, Florence; Maurer, Daniele; Le Gall, Patrik; Mortreux, Serge; Baldi, Yoann; Orsoni, Valerie; Bouchoucha, Marc; Le Roy, Valerian; Pouvreau, Stephane; Queau, Isabelle; Lamoureux, Alice.
Depuis 1992, la surveillance de la santé des mollusques marins du littoral français est assurée par le réseau de Pathologie des Mollusques (Repamo). Ses activités s’inscrivent dans le cadre de la Directive Européenne 2006/88/CE. Depuis son évaluation par la plateforme nationale d’épidémiosurveillance en santé animale en 2012, l’objectif de surveillance est la détection précoce des infections dues à des organismes pathogènes exotiques et émergents affectant les mollusques marins sauvages et d’élevage. L’année 2015 est la première année de transition pour laquelle un début d’évolution des modalités de surveillance de la santé des mollusques marins animées par l’Ifremer a été amorcé. Un dispositif hybride de surveillance a été mis en place, s’appuyant sur...
Tipo: Text Palavras-chave: Réseau; Surveillance; Pathologie; Mollusques; Coquillages; Santé; Mortalité; Maladie.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00324/43486/42945.pdf
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Bilans depuis 1999 et évolution de la stratégie du REPAMO ArchiMer
Thebault, Anne; Martin, Anne-genevieve; Pichot, Yves; Chollet, Bruno; Robert, Maeva; Le Coguic, Yvette; Tige, Gilbert; Hirata, Toshio; Mazurie, Joseph; Le Saux, Jean-claude; Masson, Nadine; Auby, Isabelle; Maurer, Daniele; Le Roux, Frédérique; Cochennec, Nathalie; Renault, Tristan; Berthe, Franck; Grizel, Henri.
The main objectives of the Mollusc Pathology Network (REPAMO) are to prevent introductions or outbreaks of infectious agents, prevent spread within a farm and especially from one farm to another, to study ways of decreasing the impact of infectious agent and to monitor the development of these pathogens in order to guarantee the health status of oysters exchanged with our commercial partners. On the whole, REPAMO's activities have not changed and include: - monitoring the development of diseases that have to be reported to authorities and carrying out analyses to classify zones: bonamiosis and marteiliosis; - baseline monitoring of farmed and wild populations of bivalve molluscs; - studying cases of abnormal mortality events; - controlling mollusc...
Tipo: Text Palavras-chave: Mollusques; Réseau surveillance; Pathologie; REPAMO.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/acte-3265.pdf
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Caractérisation des composantes hydrodynamiques d'un système côtier semi-fermé : Le Bassin de Marennes-Oléron ArchiMer
Stanisiere, Jean-yves; Dumas, Franck; Plus, Martin; Maurer, Daniele; Robert, Stephane.
Introduction and objectives of the study: Understanding the operating modes of the coastline systems requires the study of the hydrodynamics responsible for transporting the whole of the geobiological compartments of which they are composed. The idea of maintaining a close connexion between the physics, biology, geology and chemistry of the oceans is not new, and was for that matter the subject of a note in the first report of the International Council for the Study of the Oceans (ICSS) in 1902 (Sverdrup et al., 1954): ... it was seen from the beginning that the study of the physical conditions, of the chemical nature of the ocean waters, of the currents, etc., was of the greatest importance for the investigation of the problems connected with life, that...
Tipo: Text Palavras-chave: France; Atlantic north east; Marennes Oleron basin; Modellling; Hydrodynamic.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2353.pdf
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Caractérisation des composantes hydrodynamiques d'une lagune mésotidale, le Bassin d'Arcachon. ArchiMer
Plus, Martin; Maurer, Daniele; Stanisiere, Jean-yves; Dumas, Franck.
Introduction and objectives of the study: Understanding the operation modes of the coastline systems requires the study of the hydrodynamics responsible for transporting the whole of the chemical and biological elements of which they are composed. The idea of maintaining a close connexion between the physics, biology, geology and chemistry of the oceans is not new, and was for that matter the subject of a note in the first report of the International Council for the Study of the Oceans (ICSS) in 1902 (Sverdrup et al., 1954): " it was seen from the beginning that the study of the physical conditions, of the chemical nature of the ocean waters, of the currents, etc., was of the greatest importance for the investigation of the problems connected with life,...
Tipo: Text Palavras-chave: France; Atlantic north east; Arcachon basin; Modelling; Measuring; Current; Hydrodynamic.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2352.pdf
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Caractéristiques des mortalités estivales de l'huître Crassostrea gigas dans le bassin d'Arcachon ArchiMer
Maurer, Daniele; Comps, Michel; His, Edouard.
Summer mortalities in the Pacific oyster in the Bay of Arcachon were analysed during four years (1981 to 1984). Mortalities occur mostly among one year old oyster and affect the whole bay, with different prevalence. The phenomenon occurs at certain times during the summer spawning period and is associated with high temperatures. A thinning of the digestive tubule epithelium is observed, but there is no evidence of infectious disease. The failure to find a causative agent, pollution or pathogen, tends to strengthen a physiological disorder hypothesis, related to environmental conditions. The influence of external (temperature, available food) and internai factors (length, maturation, spawning) on this phenomenon is discussed. A comparaison is drawn with...
Tipo: Text Palavras-chave: Bay of Arcachon; Summer mortalities; Crassostrea gigas; Bassin d'Arcachon; Mortalités estivales; Crassostrea gigas.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/publication-4318.pdf
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Coastal phytoplankton community dynamics and coexistence driven by intragroup density-dependence, light and hydrodynamics ArchiMer
Barraquand, F.; Picoche, C.; Maurer, Daniele; Carassou, L.; Auby, Isabelle.
Phytoplanktonic communities maintain a high diversity in a seemingly homogeneous environment, competing for the same set of resources. Many theories have been proposed to explain this coexistence despite likely competition, such as contrasted responses to temporal environmental variation. However, theory has developed at a faster pace than empirical evaluation using field data, which requires inferring drivers of community dynamics from observational time series. Here, we combine autoregressive models with a data set spanning more than 20 years of phytoplankton counts every two weeks, together with nutrients and physical variables. By comparing models dominated by nutrients or physical variables (hydrodynamics and climate), we first explore which abiotic...
Tipo: Text Palavras-chave: Competition; Diatoms; Dinoflagellates; Hydrodynamics; Interactions; MAR; Mutualism; Network; Population dynamics; Seasonality; Time series.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00461/57257/59285.pdf
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Contribution à l’étude de l’origine de la chlorophylle dans le bassin d’Arcachon ArchiMer
Maurer, Daniele; D'Amico, Florence; Meteigner, Claire; Rumebe, Myriam; Rigouin, Loic; Tournaire, Marie-pierre; Trut, Gilles; Ganthy, Florian; Gouriou, Laure; Auby, Isabelle; Oger-jeanneret, Helene; Savoye, Nicolas; Lienart, Camilla; Jude, Florence; Del Amo, Yolanda; Beaugard, Laureen.
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00387/49806/50380.pdf
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Croissance de l'huitre japonaise Crassostrea gigas en cylindre rotatif Stanway. Premiers resultats en France ArchiMer
Robert, Rene; Maurer, Daniele.
A new method of oyster cultivation, the Stanway oyster cylinder, has been experimented in the basin of Arcachon since the autumn of 1989. The first observations on three species of juvenile bivalves showed that this system could be successfully used with the Japanese oyster Crassostrea gigas . A comparative study of the growth of this last species, reared in cylinders and oyster bags, has been carried out since spring 1990. The first results showed that the growth of juveniles and 18 months old oysters in cylinders is not as good as in bags. On the other hand, mortality did not differ between both techniques: less than 3%. This new system seems to be less efficient than the traditional French way of rearing oysters. However, an improvement in the quality...
Tipo: Text Palavras-chave: Crassostrea gigas; Bivalvia; Juveniles; Oyster culture; Growth; Rearing.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-917.pdf
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Croissance, engraissement et cycle sexuel de Crassostrea gigas dans le Bassin d'Arachon: comparaison des huîtres agées de 1 et 2 ans ArchiMer
Maurer, Daniele; Borel, Michel.
Two-year-old oysters have a physiology which is reproduction-oriented, their maturation occurring synchronously among oysters from the same batch. The importance of the spring accumulation of glycogenated stocks varies through the years and correlates with the growth stage. Glucidic components are quickly used during the month preceding egg-laying and are transformed into lipid stocks for the oocytes. One-year-old oysters develop at different rates, some of them not showing any sign of maturation and the percentage of laying individuals varies through the years. Glycogenated stocks accumulate in a similar way in both age-classes and their more precocious and more intense use by young molluscs is not necessarily linked with their gametogenesis and growth,...
Tipo: Text Palavras-chave: Bay of Arcachon; Maturation; Biochemistry; Crassostrea gigas; Bassin d'Arcachon; Maturation; Biochimie; Crassostrea gigas.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-6182.PDF
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Estimation de la biomasse d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon. Été 1985. ArchiMer
Maurer, Daniele; Borel, Michel; Dreno, Jean-paul.
L'élaboration d'un modèle de gestion d'un bassin conchylicole nécessite, en particulier, la connaissance de l’évolution des stocks d'huîtres d'une année à l'autre afin d'en apprécier l'influence éventuelle sur le rendement. Le présent travail décrit la méthodologie utilisée et les résultats obtenus au cours de la première estimation du stock d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon en 1985. Cette estimation nécessite l'utilisation simultanée de photographies aériennes (évaluation de la surface réellement exploitée ) et de sondages-terrain (évaluation de la biomasse par unité de surface). Ces derniers ont également permis de valider les résultats obtenus par photographie. En 1985, le taux d'exploitation variait, selon la zone...
Tipo: Text Palavras-chave: Crassostrea gigas; Biomasse; Bassin d'Arcachon; Crassostrea gigas; Biomass; Bay of Arcachon.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00102/21342/18965.pdf
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Estimation de la biomasse d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon. Etés 1986 et 1987 ArchiMer
Maurer, Daniele; Parache, Alain; Dreno, Jean-paul.
Afin d ' améliorer la précision des résultats et depuis 1986, quelques modifications ont été apportées à la stratégie d'échantillonnage qui avait été adoptée en 1985 : - prise en compte de la structure en âge de l a population, en différenciant les huîtres âgées de 1 an de celles d'âge supérieur, - traitement séparé des poches et des collecteurs pour l'élevage en sur élevé . Au cours des trois années , le stock d'huîtres en élevage est resté relativement stable : 1985 37 996 t ± 1 970 t précision 5,1% 1986 37 835 t ± 4 196 t précision 11,1% 1987 39 079 t i 3 350 t précision 8,6% avec environ 80% représenté par la culture à plat. Cependant, il est apparu que les différentes variables estimées et leur précision variaient d'une année à l 'autre en liaison...
Tipo: Text Palavras-chave: Crassostrea gigas; Biomasse; Bassin d'Arcachon.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00430/54141/55471.pdf
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Estimation de la teneur en acétate de tributyle étain dans l'eau de mer, par une méthode biologique ArchiMer
His, Edouard; Maurer, Daniele; Robert, Rene.
L’acétate de tributyle-étain, composé actif de certaines peintures antisalissures, représente un danger certain pour les zones conchylicoles de captage (E. HIS et R. ROBERT, 1980 et R. ROBERT et E. HIS, 1981). Les méthodes chimiques actuelles ne sont pas assez sensibles pour permettre le dosage de ce produit dans l'eau de mer, au seuil de toxicité pour les larves d'huitres. Une échelle d'action pour douze concentrations comprises entre 100 ug/l. et 0,02 ug/ l., sur les véligères de Crassostrea gigas est proposée. Elle permet d’évaluer le degré de contamination de l'eau de mer d'un part de plaisance et son évolution.
Tipo: Text
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00090/20162/17815.pdf
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Estimation du captage de naissains dans le Bassin d'Arcachon en 2008. Première approche d’une méthodologie nationale dans le cadre du projet Velyger ArchiMer
Maurer, Daniele; Defenouillere, Pauline; Auby, Isabelle.
Ce document décrit la méthodologie proposée pour apprécier l'intensité du captage des naissains d'huîtres creuses sur un bassin conchylicole.
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00079/19028/16606.pdf
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Estimation du captage d'huître Crassostrea gigas dans le bassin d'Arcachon de 1985 à 1989 ArchiMer
Maurer, Daniele; Borel, Michel.
Les conditions très favorables à la reproduction de l'huître dans le bassin d'Arcachon, lui ont donné traditionnellement une vocation de centre de captage. Cette activité, très perturbée durant 5 années consécutives (peintures antisalissure à base d'organostanniques), a retrouvé son cours normal depuis 1982. Il est donc apparu intéressant de faire le point sur l'importance du captage réalisé dans le bassin, du fait de ses répercussions à la fois sur la vente de naissains et sur le recrutement de la population de Crassostrea gigas en élevage. Les estimations ont été menées durant 5 années, de 1985 à 1989, selon différents plans d'échantillonnage.
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Ano: 1990 URL: http://archimer.ifremer.fr/doc/00081/19185/16780.pdf
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Estimation du stock d’huîtres sauvages et en élevage dans le Bassin d’Arcachon ArchiMer
Scourzic, Thomas; Loyen, M.; Fabre, E.; Tessier, Anne; Dalias, N.; Trut, Gilles; Maurer, Daniele; Simmonnet, Bastien.
Within the framework of the mission of creation of a “Parc Naturel Marin" in the Bay of Arcachon, estimations of the oysters stocks in the Bay were realized in 2011 by the engineering consulting firm Océanide, in association with the “Agence des Aires Marines Protégées”, the French Research Institute for the Exploitation of the Sea ( IFREMER) - Station of Arcachon and the Departmental Direction of Territories and the Sea of Gironde – “Délégation à la Mer et au Littoral (DLM)”. The evaluation of the stock of cultivated oysters was made from production statements of the shellfish farmers, collected in 2010 by the DML. The estimation of the stocks of wild oysters was made using a stratified two degrees field sampling. Finally, 82 500 t of oysters are present...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00070/18081/15627.pdf
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Etude de faisabilité d’opérations de ‘repeuplement orienté’ dans deux sites français de captage de l’huître creuse (Crassostrea gigas) ArchiMer
Bernard, Ismael; Lapegue, Sylvie; Dumas, Franck; Talarmain, Eric; Cornette, Florence; Degremont, Lionel; Chavanne, Herve; Pouvreau, Stephane; Auby, Isabelle; Maurer, Daniele; Plus, Martin; Le Moine, Olivier; Boudry, Pierre.
La forte augmentation des mortalités de juvéniles d’huître creuse depuis 2008 a relancé la problématique de l’approvisionnement en naissains de l’ostréiculture française. Dans ce contexte, cette étude a pour objectif d’étudier la faisabilité d’opérations de repeuplement en huîtres génétiquement plus résistantes, afin d’améliorer les performances de survie du naissain capté dans le milieu naturel. Cette étude s’est ainsi focalisée sur les deux bassins naisseurs historiques, Marennes-Oléron et Arcachon. Nous avons donc cherché à établir (1) une hiérarchie des bancs en fonction de l’expulsion de larves d’huître dans le bassin d’Arcachon, (2) une cartographie des liens en termes de connectivité entre les bancs des pertuis charentais et (3) la faisabilité du...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00083/19410/17013.pdf
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