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| Registros recuperados: 45 | |
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| Lagarde, Franck. |
| La conchyliculture est une activité importante dans le bassin de Marennes-Oléron. L'aquaculture extensive de l'huitre japonaise (Crassostrea gigas ) représente, avec 130 000 tonnes par an, la première ressource marine nationale (Héral, 1986) dont 40 % se fait dans ce bassin. Il est donc important de connaître et d'étudier l'ensemble des phénomènes du bassin. Depuis 1970, on observe un ralentissement de la croissance des huîtres sur le bassin et une baisse de productivité sur certains bancs ostréicoles exploités tels que Ronce les Bains (25 % de mortalité en Juillet 1996 ) et le banc de Perquis (25 % de mortalité en Juillet 1996) (REMORA 1995). Depuis 1988, les élevages ostréicoles de Charente-Maritime subissent en périodes printanières et estivales, des... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00305/41572/40780.pdf |
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| Lagarde, Franck; Roque D'Orbcastel, Emmanuelle; Perignon, Adeline; Mortreux, Serge; Fuhrmann, Marine; Le Gall, Patrik; Leurion, Axel; Chiantella, Claude; Bec, Beatrice; Roques, Cecile; Bonnet, Delphine; Cochet, Helene; Boj, Marie; Gervasoni, Erika; Miron, Gilles; Fiandrino, Annie; Pouvreau, Stephane; Pernet, Fabrice. |
| We bring new items in connection with the origins of the natural recruitment variability of the Pacific oyster Crassostrea gigas in Thau lagoon. A poor relationship between " number of larvae" and "number of spat" in 2012 shows a biological lock around oysterculture areas during the metamorphosis in spite of better success of recruitment outside shellfish farming zone. A comprehensive analysis of environmental factors effects and the development of prognosis tools are planned to assist oysterfarmers in rationalization of natural oyster recruitment around Mediterranean lagoon. |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00165/27653/25822.pdf |
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| Goulletquer, Philippe; Lagarde, Franck. |
| Le bassin de Marennes-Oléron est le premier site ostréicole européen. Depuis 1988 des mortalités chroniques apparaissent sur les élevages conchylicoles. En 1996, un programme de suivi de mortalité et des paramètres environnementaux a été développé. Les différentes conclusions retenues au cours des années antérieures font état de brusques variations de température suspectées dans l'apparition de ces mortalités. Une approche écophysiologique des huîtres par l'intermédiaire de la mesure de respiration a permis de déterminer l'effet significatif d'un stress thermique (∆T=28°C). La maturité sexuelle apparaît également comme un facteur prépondérant dans la demande métabolique. A l'issue de cette étude, il apparaît que les huîtres matures et de surcroît stressées... |
| Tipo: Text |
Palavras-chave: Ecophysiologie; Physiologie; Huître creuse; Bassin de Marennes-Oléron. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00076/18761/16332.pdf |
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| Derolez, Valerie; Soudant, Dominique; Richard, Marion; Lagarde, Franck; Chiantella, Claude; Malet, Nathalie. |
| Thau lagoon (south of France) is one of the largest Mediterranean coastal lagoons (Fig. 1). It supports many ecosystem services such as shellfish farming, whose production reaches 10 000 tons a year. Since the 1960s, the increase of anthropogenic inputs, linked to the exponential growth of human population (Fig. 2), have resulted in contaminations of shellfish farming and the eutrophication of Thau lagoon, with significant ecological and socio-economic impacts (Mongruel et al. 2013). Since the 1970s and the late 2000s, the considerable efforts made to water depuration systems on the watershed have induced a significant decrease of nutrient inputs (Fig. 2), and have gradually led to a good environmental status of the lagoon according to the Water Framework... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00406/51794/52394.pdf |
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| Pernet, Fabrice; Lagarde, Franck; Cesmat, Ludovic; Jeannée, Nicolas; Barret, Jean; Le Gall, Patrik; Quere, Claudie; Fiandrino, Annie; Miguet, Marine; Boulet, Hélène; Keck, Nicolas; Roque D'Orbcastel, Emmanuelle. |
| Cette étude avait pour objectif principal de déterminer les facteurs explicatifs de la dynamique spatio-temporelle des surmortalités d’huîtres creuses dans la lagune de Thau. Les facteurs étudiés étaient : la pathologie (détection d’ADN appartenant à l’Ostreid herpesvirus 1 OsHV-1 et au groupe bactérien Vibrio splendidus), l’état énergétique des huîtres (triglycérides, sucres totaux et acides gras comme marqueurs trophiques), les pratiques d’élevage et l’hydrodynamique. Afin de répondre à ces objectifs, nous avons suivi la mortalité d’un lot d’huîtres sentinelles, âgé de moins d’un an, maintenu indemne de mortalité, dans lequel on ne détectait pas d’ADN appartenant à OsHV-1. Le lot a été déployé mi-mars 2011 sur 106 stations dans la lagune de Thau, où les... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00092/20355/18015.pdf |
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| Pete, Romain; Guyondet, Thomas; Bec, Beatrice; Derolez, Valerie; Cesmat, Ludovic; Lagarde, Franck; Pouvreau, Stephane; Fiandrino, Annie; Richard, Marion. |
| The decrease of microbial and nutrient inputs from the watershed has long dominated lagoon ecosystem management objectives. Phytoplankton biomass and abundance have drastically decreased for more than a decade and Zostera meadow have gradually recovered, expressing lagoon ecosystem restoration such as Thau lagoon. Do the progressive achievement of the good ecological status of the Thau lagoon possibly threatens the shellfish industry in terms of production and oyster quality, by reducing the carrying capacity? To provide answers about the right balance to be achieved between conservation and exploitation, a new numerical tool was developed to help in decision-making. We hereby propose to incorporate a Dynamic Energy Budget type shellfish production model... |
| Tipo: Text |
Palavras-chave: Shellfish farming; Carrying capacity; Stakeholder implication; Nitrogen and phosphorus inputs; Water frame directive; Ecological indicators; Phytoplankton depletion; Coupled biogeochemical-deb model. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00622/73395/75312.pdf |
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| Derolez, Valerie; Malet, Nathalie; Fiandrino, Annie; Lagarde, Franck; Richard, Marion; Ouisse, Vincent; Bec, Beatrice; Aliaume, Catherine. |
| Thau lagoon is a large Mediterranean coastal lagoons and it supports traditional shellfish farming activities. It has been subject to eutrophication leading to major anoxic events associated with massive mortalities of shellfish stocks. Since the 1970s, improvements have been made to wastewater treatment systems, which have gradually led to oligotrophication of the lagoon. The aim of our study was to determine how the decrease in nutrient inputs resulted in major ecological changes in Thau lagoon, by analysing five decades of time-series (1970–2018) of observations on pelagic and benthic autotrophic communities. We were able to identify two periods during the oligotrophication process. Period 1 (1970–1992) was considered a eutrophic period, characterised... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74068/73521.pdf |
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| Goulletquer, Philippe; Le Moine, Olivier; Soletchnik, Patrick; Razet, Daniel; Turpin, Vincent; Robert, Jean-michel; Gras, Paul; Faury, Nicole; Geairon, Philippe; Taillade, Sylvie; Lodato, Marie; Lagarde, Franck. |
| La contractualisation SRC/IFREMER-URAPC concernait en 1996 trois actions spécifiques : • Expertise pour les cultures d'huîtres en eaux profondes, • Suivi de l'activité physiologique sur le banc de Ronce, • Valorisation des claires ostréicoles - optimisation du processus d'affinage. Le premier thème n'a pu être abordé que via les différentes réunions préparatoires SRC Ré Centre Ouest, Marennes-Oléron et les commissions des cultures marines. Depuis l'accord de la CCM de La Rochelle en date du 11/04/1996, le dossier reste en attente d'un accord budgétaire des différents partenaires. Le second thème concerne le suivi de l'activité physiologique des huîtres creuses sur le banc ostréicole de Ronce-Perquis. La méthodologie est basée sur l'utilisation d'un... |
| Tipo: Text |
Palavras-chave: Ostréiculture; Elevage en eaux profondes; Crassostrea gigas; Physilogie; Mortalité; Claire ostréicole; Bassin de Marennes Oléron; Charente-Maritime. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00102/21316/18936.pdf |
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| Le Gall, Patrik; Lagarde, Franck; Pichot, Yves; Grizel, Henri; Hamon, Pierre-yves; Vercelli, Catherine. |
| This report presents the main results for 2002 of the eight points in the Lagune de Thau, in accordance with the monitoring network REMORA: 3 national points and 5 regional added by the «Laboratoire Conchylicole de Méditerranée». Only adults batch is observed in the Mediterranean sea. This year the mortality ratio is low (< 5 %), without significant differences between areas. Like for the whole national network, the average individual weight are less than previous years in Bouzigues and Marseillan area ; in opposite Mèze area has better results. Bouzigues area presents the best productivity rate (3.1) and the worst in the middle of the zone. The AFNOR index, calculed in December, allows to classify the oysters like "spéciales". The best values are... |
| Tipo: Text |
Palavras-chave: REMORA; Méditerranée.; Huître creuse; Crassastrea gigas; Mortalité; Qualité; France; Lagune de Thau; Croissance; REMORA; France; Mediterranean Sea; Lagune de Thau; Crassos/rea gigas; Mortality; Growth; Quality; Polvdora sv.. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00113/22385/20080.pdf |
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| Ubertini, Martin; Fiandrino, Annie; Bernard, Ismael; Thomas, Yoann; Dumas, Franck; Pouvreau, Stephane; Roque D'Orbcastel, Emmanuelle; Lagarde, Franck. |
| The Thau lagoon, located at the South of France, provides 10% of the French pacific oyster Crassostrea gigas production (Robert et al., 2013). Despite this intensive shellfish production, the larval recruitment of this species within the Thau lagoon is still misunderstood and spat collection remains highly variable; as a consequence, shellfish farmers rely mostly on hatchery's spat. In 2012, the PRONAMED II project was launched, aiming to improve our understanding of the C. gigas reproductive cycle within Mediterranean lagoons and to explore the feasibility for oyster-spat collecting. In addition to an extensive sampling work encompassing both spatial and temporal features of larval recruitment, we tried to understand the contribution of larval dispersal... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00248/35905/34427.pdf |
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| Ubertini, Martin; Lagarde, Franck; Le Gall, Patrik; Mortreux, Serge; Pernet, Fabrice; Fiandrino, Annie; Pouvreau, Stephane; Roque D'Orbcastel, Emmanuelle. |
| The aquaculture of the oyster Crassostrea gigas is largely based on natural recruitment of the species on spat collectors along the french Atlantic coast, the remaining spat being provided by hatcheries and nurseries. Due to an increase in the climate/meteorological variability, during the last twenty years, the natural spat collection has become variable, from null to overabundant depending on the year. Since 2008, the oyster spat mortalities worsen the situation, reducing the available spat and increasing the cost of the latter. However, the temporal variability of the natural recruitment modalities in the Mediterranean do not allow the aquaculture industry to rely on native spats, making the understanding of natural recruitment in the Mediterranean a... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00248/35894/34422.pdf |
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| Lagarde, Franck; Richard, Marion; Bec, Beatrice; Roques, Cecile; Mortreux, Serge; Bernard, Ismael; Chiantella, Claude; Messiaen, Gregory; Nadalini, Jean-bruno; Hori, Masakazu; Hamaguchi, Masami; Pouvreau, Stephane; Roque D'Orbcastel, Emmanuelle; Tremblay, Rejean. |
| Reproduction and recruitment of benthic invertebrates are influenced by the climate and by the ecological structure of marine ecosystems, along with local anthropogenic pressures such as eutrophication or oligotrophication. Using the Pacific oyster Crassostrea gigas as a biological model, we tested the hypothesis that the variability in prodissoconch II (PII) size (i.e. size at metamorphosis) depends on ecological functioning. Settlement and recruitment were assessed at 5 sampling sites on the French Mediterranean shellfish farmed Thau lagoon during the main summer recruitment events in 3 consecutive years (2012-2014). Hydrobiological and planktonic analyses were conducted at 3 sampling sites. Our results showed that recruitment was extremely... |
| Tipo: Text |
Palavras-chave: Larval ecology; Recruitment; Prodissoconch II; Crassostrea gigas; Oligotrophication; Cryptophytes; Thau lagoon. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56613/58334.pdf |
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| Hori, Masakazu; Hamaoka, Hideki; Hirota, Masahito; Lagarde, Franck; Vaz, Sandrine; Hamaguchi, Masami; Hori, Juri; Makino, Mitsutaku. |
| Harmonizing coastal fisheries with water-quality improvement has become an essential factor for the sustainable use of coastal ecosystem services. Here, we present the scope of our study based on an interdisciplinary approach including ecological actions, socio-economic actions and socio-psychological actions. We chose to focus on the interaction between oyster aquaculture and seagrass vegetation as a typical ecological action using the coastal ecosystem complex (CEC) concept. Coastal organisms have adapted their traits to the environment over a long period of time, so that restoration of the CEC represents reconstruction of the original process of coastal production. Subtidal seagrass vegetation with intertidal oyster reefs is the original CEC in Japan,... |
| Tipo: Text |
Palavras-chave: Oyster aquaculture; Seagrass; Indigenous and local knowledge; Integrated coastal management. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00429/54019/57439.pdf |
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| Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Corporeau, Charlotte; Degremont, Lionel; Lagarde, Franck; Pepin, Jean-francois; Keck, Nicolas. |
| Experiments were conducted to investigate the effects of farming sites, seeding date, age of oysters, ploidy level and rearing structures on mortality, pathogens and energetic reserves of oysters Crassostrea gigas. Mortality of oysters coincided with infections involving, primarily, the ostreid herpesvirus OsHV-1 and, secondarily, bacteria of the group Vibrio splendidus, when seawater temperature was between 17 and 24°C. Mortality started in early May and lasted until late September, with an interruption in July and August when seawater temperatures rose above 24°C. Mortality varied with farming site: oysters maintained in the open Mediterranean Sea showed no mortality and OsHV-1 was occasionally detected at a low level only, while oysters maintained in... |
| Tipo: Text |
Palavras-chave: Pacific oyster; Mortality; Disease; Farming practices; Hydrodynamics; Energetic. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00086/19739/17379.pdf |
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| Munaron, Dominique; Hubert, Clarisse; Mortreux, Serge; Messiaen, Gregory; Lagarde, Franck; Derolez, Valerie; Tapie, Nathalie; Budzinski, Hélène; Le Roux, Gwenolé; Giraud, Anaïs. |
| Ce travail a permis de construire et de valider un indicateur d'évaluation du risque lié à la présence de pesticides dans les lagunes méditerranéennes françaises. Cet indicateur, le Quotient de Risque (QR) s'appuie sur une stratégie de suivi globale, adaptée au contexte des lagunes, de leurs fortes dilutions et de leur dynamique complexe, tout en prenant en compte l'effet des mélanges de pesticides dans les eaux. Pour cela, la liste des pesticides à rechercher en priorité pour les lagunes, ainsi que le mode, les sites et les fréquences d'échantillonnage ont été définis et discutés au regard des résultats du suivi annuel des étangs de Thau et de l'Or, réalisé en 2015-16 par échantillonneurs intégratifs POCIS. 90 pesticides prioritaires pour les lagunes ont... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00379/49065/49513.pdf |
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| Pernet, Fabrice; Lagarde, Franck; Le Gall, Patrik; Roque D'Orbcastel, Emmanuelle. |
| We present the first large-scale, high-resolution spatial and temporal pattern of disease mortality caused by Ostreid herpesvirus 1 (OsHV-1) that has affected Pacific oyster Crassostrea gigas in France every year since 2008, in relation to local farm use. Mortality was monitored in healthy oyster spat deployed at 106 locations in the Thau Mediterranean lagoon during the epizootic that occurred in spring 2011. We conducted a field survey of farming practices in the areas where the sentinel oysters were placed before the epizootic. We found that the risk of disease mortality in sentinel oysters was higher within the bivalve farming area than outside it, suggesting that the infection pressure is much higher in areas with intensive farming activity. The risk... |
| Tipo: Text |
Palavras-chave: Aquaculture; Epidemiology; OsHV-1; Shellfish farming. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00201/31248/30662.pdf |
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| Pouvreau, Stephane; Bellec, Gwenael; Le Souchu, Pierrick; Queau, Isabelle; Talarmain, Eric; Alunno-bruscia, Marianne; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Fleury, Elodie; Langlade, Aime; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Hitier, Benoist; Bedier, Edouard; Robert, Stephane; Guilpain, Patrice; Grizon, James; Seugnet, Jean-luc; Guesdon, Stephane; Lagarde, Franck; Le Gall, Patrik; Messiaen, Gregory; Roque D'Orbcastel, Emmanuelle; Gohin, Francis; Bryere, Philippe; Quemener, Loic; Repecaud, Michel; Bucas, Karenn; Barbot, Stephane; Guillemot, Anne; Nonnotte, Lidwine; Duros, Wenceslas; Bonnat, Armel; Tarot, Stephane; Mille, Dominique; Geay, Amelie; Bouquet, Anne-lise. |
| La conchyliculture, et principalement l’élevage de l’huître creuse, Crassostrea gigas, constitue la principale activité aquacole française. Cette activité repose, en grande partie, sur le recrutement naturel de l’espèce qui assure 70% des besoins en jeunes huîtres (naissain) : cette activité de collecte s’appelle le captage. Les deux principaux centres de captage en France sont les bassins d’Arcachon et de Marennes-Oléron. Or, depuis une dizaine d'années, sur le Bassin d'Arcachon, le captage devient très variable: à des années de captage nul (par exemple les années 2002, 2005, 2007) ou faible (2009, 2010, 2011) succèdent des années excellentes voire pléthoriques (les années 2003, 2006, 2008, 2012). A Marennes-Oléron, cette variabilité existe, mais s’avère... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00135/24648/22681.pdf |
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| Pernet, Fabrice; Lagarde, Franck; Jeannee, Nicolas; Daigle, Gaetan; Barret, Jean; Le Gall, Patrik; Quere, Claudie; Roque D'Orbcastel, Emmanuelle. |
| Although spatial studies of diseases on land have a long history, far fewer have been made on aquatic diseases. Here, we present the first large-scale, high-resolution spatial and temporal representation of a mass mortality phenomenon cause by the Ostreid herpesvirus (OsHV-1) that has affected oysters (Crassostrea gigas) every year since 2008, in relation to their energetic reserves and the quality of their food. Disease mortality was investigated in healthy oysters deployed at 106 locations in the Thau Mediterranean lagoon before the start of the epizootic in spring 2011. We found that disease mortality of oysters showed strong spatial dependence clearly reflecting the epizootic process of local transmission. Disease initiated inside oyster farms spread... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00181/29249/27663.pdf |
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| Registros recuperados: 45 | |
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