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| Registros recuperados: 168 | |
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| Soletchnik, Patrick; Bouchet, Vincent; Malestroit, Pascal; Seugnet, Jean-luc; Blouin, Frederic; Radford-knoery, Joël; Burgeot, Thierry; Sauriau, Pierre-guy. |
| In the scope of the study of the "on-bottom/off-bottom" mortality model in the south of the Marennes Oléron Bay, the result of the 2003 multidisciplinary study (Dynamor) appears to be the hypothesis of an acute stress, "ultimate" trigger of the mortality episodes in June. In 2004 we aim to look for the nature of this stress through the physico-chemical analysis of the sediment (Eh, pH, sulphides and ammoniacal nitrogen), the organic matter and chlorophyll load on the surface of the sediment between April and July. Herbicides are also measured in the water column, south of the bay (Seudre), during the same period. A "precocious" (around the first week of June) and "weak" (lower mortality rate on this working site since 1997) mortality peak happens when the... |
| Tipo: Text |
Palavras-chave: Bassin Marennes Oléron; Phytobenthos; Mortalité; Crassostrea gigas; Foraminiferes benthiques; Répartition verticale; Sédiment; Huître; Echantillonnage. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-3383.pdf |
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| Bedier, Edouard; Fleury, Pierre-gildas; Langlade, Aime; Haure, Joel; Le Roux, A.; Ropert, Michel; Rauflet, Fabienne; Soletchnik, Patrick. |
| The "sedimentary risk" has been identified since the mid-nineties in the Marennes Oléron Bay. The proximity of the sediment (from 0 to 15cms) increases the mortality rate. Depending on the year, mortality can be 10 to 20 % higher than in "high" conditions (50 to 70cms). These zootechnic results, gathered since 1996 on the working site of Ronces Perquis, lead to the research of a pathogenic agent or a toxic substance released by the sediment. Studies conducted between 2002 and 2003 [12, 18] did not allow the identification of any pathogenic agents and ruled out the infectious risk. In 2004, the chemical risk (sulphides, ammoniacal nitrogen) was studied on 4 sites (3 working sites + Quiberon). In 2004, the "on-bottom/off bottom" mortality model of the... |
| Tipo: Text |
Palavras-chave: MOREST; Hydrologie; Zootechnie; Sédimentologie; Mortalités; Crassostrea gigas; Huîtres. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3411.pdf |
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| Pepin, Jean-francois; Robert, Stephane; Soletchnik, Patrick; Seugnet, Jean-luc; Morin, Dimitri; Chabirand, Jean-michel; Costes, Louis; Geairon, Philippe; Grizon, James. |
| In France, today, more than 80% of farmed blue mussel seed collection is based on larvae fixation on collector ropes. Mussels are traditionally grown on bouchot, which are rows of wooden poles placed perpendicularly to the shore, stuck in the ground within the gently sloping intertidal strip. Mussels are transferred either as seed attached on collecting ropes or as juveniles placed in net sockings and then wound up around the poles or suspended to longlines, where they will fatten and grow (Garen et al., 2004). In order to optimize seed collection and to limit unwanted biofouling on ropes, mussel growers local organizations identify best timing of seed collector ropes deployment by monitoring the number and size of planktonic mussel larvae from water... |
| Tipo: Text |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00455/56620/58332.pdf |
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| Soletchnik, Patrick; Razet, Daniel; Geairon, Philippe; Faury, Nicole; Goulletquer, Philippe. |
| The study of sexual maturation and spawning in the Pacific oyster (Crassostrea gigas) is part of a vast research programme that endeavours to understand the causes of mortality that occur sporadically during the spring and summer seasons in the Marennes-Oléron Bay. Thermal and diet conditioning were used to obtain oysters at each stage of maturity simultaneously. Using the measured rates of clearance, consumption, absorption and respiration provided estimates of growth potential and gave the energetic budget of oysters at different stages of sexual maturity. Physiological responses were similar for males and females. Filtration decreased from 2.4 to 2.6 l.h (-1) to 1.8 l.h (-1) with increasing maturity. Weight gain was associated with gonad development and... |
| Tipo: Text |
Palavras-chave: Ponte; Maturation; Crassostrea gigas; Ecophysiologie. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3251.pdf |
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| Smolarz, Kasia; Renault, Tristan; Soletchnik, Patrick; Wolowicz, Macciek. |
| A flow cytometry protocol was applied for the detection of neoplasia in Macoma balthica L. from the Gulf of Gdansk (Baltic Sea, Poland). A simple method, based on an osmotic shock, was used to permeabilise gill cells. The cytometric pattern of normal clams consisted of 2 peaks, a major peak B and a smaller peak C. The cytometric pattern of affected clams consisted of 2 peaks named B' and C'. Two parameters were used to define the stages of abnormalities in M. balthica clams based on the percentage of cells in peaks B, C, B' and C' and on the ratio between the fluorescence value of peaks B, C, B' and C' in all individuals. Three stages of neoplasia were clearly distinguished by flow cytometry considering peak C'. Stage 1 was characterised by a major... |
| Tipo: Text |
Palavras-chave: Baltic Sea; Macoma balthica; Neoplasia; Cytogenetics; Histology; Flow cytometry. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-2918.pdf |
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| Gagnaire, Beatrice; Soletchnik, Patrick; Faury, Nicole; Kerdudou, Nolwenn; Le Moine, Olivier; Renault, Tristan. |
| Internal defence mechanisms of bivalves include the hemocytes which assume several functions. Relationships exist between environmental factors, physiological state of oysters, defence system and pathogens. Hatchery oysters are more and more produced and reared in the field. The characteristics and particularly the defence system of these animals are poorly documented. In this context, two field trials were carried out from May to September 2002 and from April to July 2003 in order to monitor hemocyte parameters of diploid oysters from natural beds and hatchery-produced diploid oysters using flow cytometry. Several hemocyte parameters (cell mortality, granulocyte percentage, phagocytosis, esterase and peroxidase activities) were monitored. For both oyster... |
| Tipo: Text |
Palavras-chave: Hatchery; Natural beds; Diploids; Flow cytometry; Peroxidase activity; Esterase activity; Phagocytosis; Hemocytes; Crassostrea gigas; Pacific oyster. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3119.pdf |
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| Robert, Stephane; Razet, Daniel; Seugnet, Jean-luc; Geairon, Philippe; Guilpain, Patrice; Goulletquer, Philippe; Soletchnik, Patrick; Le Moine, Olivier; Faury, Nicole. |
| La présentation des mesures de salinités et de températures acquises au cours de l'an 2000, dans l'estuaire de la Charente s'inscrit dans la continuité de la campagne réalisée en 1999. L'objectif de cette surveillance est bien d'obtenir sur plusieurs années une évolution temporelle de ces paramètres afin 1) d'évaluer l'impact de la future retenue d'eau en amont de la Charente, 2) de caractériser les conditions température-salinité favorables (et défavorables) à la survie larvaire des huîtres en période estivale, 3) de disposer de données permettant de valider les modèles permettant de simuler les conditions trophiques des cheptels conchylicoles du Bassin de Marennes-Oléron. Ce travail s'inscrivant dans la durée, il est nécessaire dans un premier temps... |
| Tipo: Text |
Palavras-chave: Salinité; Température; Estuaire Charente; Variabilités; Marennes Oléron bassin; Charente-Maritime. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00031/14241/11516.pdf |
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| Faury, Nicole; Remoue, Sophie; Soletchnik, Patrick; Goulletquer, Philippe; Geairon, Philippe; Le Moine, Olivier; Razet, Daniel; Guilpain, Patrice; Robert, Stephane; Taillade, Sylvie. |
| This study aims to assess the broodstock origin and cultural effects on oyster summer mortality rates. Three oyster batches, two originating from the Marennes-Oléron Bay, and one from the Normandy rearing area were deployed in March 2000 on the Ronce Perquis oyster bank, on experimental site since 1996. On bottom cultured oysters were monitored until January 2001. By the end of the experiment, the cumulative mortality ranged from 51 to 58 %. Following on initial mortality rate (8.8 % to 9.3 %), oyster batches showed a critical period early July. In 15 days, mortality rate reached 13.7 %. Over the rearing period, the oyster shell growth ranged between 8.9 g and 12.7 g. The somatic gain represented 0.44-0.48 g of dry meat weight. Spawning event occured in... |
| Tipo: Text |
Palavras-chave: Taux de mortalité; Croissance; Composition biochimique; Effort de reproduction; Incorporation du glucose; Crassostrea gigas; Bassin de Marennes Oléron; Charente-Maritime; Mortality; Growth rate; Biochemical content; Glycogen synthase; Crassostrea gigas; Bay of Marennes Oleron; Charente-Maritime. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00031/14235/11511.pdf |
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| Soletchnik, Patrick; Goulletquer, Philippe; Heral, Maurice; Razet, Daniel; Geairon, Philippe. |
| This ecophysiological study was conducted on the Japanese oyster (Crassostrea gigas) reared in Marennes-Oléron bay (France), in May 1992. Measurements were achieved using natural food conditions on three different days (a, b, c) at different tide levels (coefficient of 49, 57, and 88). Total particulate matter was continuously monitored with a micro-computer and a turbidimeter probe. The "consumption" function was calculated using a new formula allowing for particulate leakage prior to the pre-ingestive particle sorting. This particle leakage represents a passive loss of particles flowing through the branchial filter. Comparisons of the consumption and absorption rates of organic matter and chlorophyll a showed significant differences between seston... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Consumption rate; Selection efficiency; Absorption rate; Energetic budget; Organic matter; Chlorophyll alpha; Marennes-Oleron bay. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/1996/publication-3086.pdf |
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| Soletchnik, Patrick. |
| The Marennes Oléron Bay, the main French oyster culture basin, is an estuarine zone which is subject to anthropic pressure. Meteorological parameters such as temperature, insolation, pluviometry determine, for the most part, the water temperature and salinity conditions for each season and control the nutrient fluxes, as well as the primary and secondary production of the basin. The average air temperature (Météo -France) stays around 12.5°C between 1950 and 1980, then rises more than 1°C in 20 years. In those 50 years, average insolation drops from 198 hours to 176 hours, corresponding to an 11% decrease. Seasonal distribution of water inputs shows that spring pluviometry increased by 30% between the 1950's and the last two decades. Precipitations also... |
| Tipo: Text |
Palavras-chave: Ressource trophique; Crassostrea gigas; Production primaire; Bassin Marennes Oléron; Ecosystème. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/acte-3381.pdf |
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| Lapegue, Sylvie; Thiriot Quievreux, Catherine; Mccombie, Helen; Heurtebise, Serge; Boudry, Pierre; Robert, Stephane; Soletchnik, Patrick; Goulletquer, Philippe; Gerard, Andre. |
| Divers travaux, menés depuis 1984, montrent qu'il existe, chez l'huître creuse Crassotrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d'aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Récemment, une étude réalisée au sein du programme européen « Genephys » a démontré que plus de 50 % de la variance pour la vitesse de croissance était liée au taux d'aneuploïdie. Le but de l'expérimentation menée en 1999 est de faire un... |
| Tipo: Text |
Palavras-chave: Génétique; Aneuploïdie; Génétique des populations; Biochimie; Marennes-Oléron; Huître creuse; Crassostrea gigas. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00044/15522/12909.pdf |
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| Pepin, Jean-francois; Benabdelmouna, Abdellah; Bierne, Nicolas; Chasselin, Leo; Degremont, Lionel; Guesdon, Stephane; Lamy, Jean-baptiste; Le Moine, Olivier; Normand, Julien; Robert, Stephane; Soletchnik, Patrick. |
| Depuis 2014, des épisodes de mortalité anormale affectent les cheptels mytilicoles tant adultes que juvéniles. Dès l’année 2015, une étude spécifique cofinancée par la DPMA et réalisée par l’Ifremer a été initiée, l’action de recherche MORBLEU (Mortalité des moules Bleues). Les années 2015- 2017 ont permis de dégager des éléments de connaissance et des pistes relatifs aux facteurs biotiques et abiotiques qui semblent intervenir dans le phénomène de hausse de mortalité des moules depuis 2014. Pour l’année 2018, les actions d’observation et de suivis du milieu et des moules ont été fortement réduites et trois axes principaux ont été poursuivis : i) l’étude de la relation entre l’évolution des équilibres microbiens planctoniques et l’apparition de mortalités... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00588/70056/67999.pdf |
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| Robert, Stephane; Goulletquer, Philippe; Soletchnik, Patrick; Geairon, Philippe; Le Moine, Olivier; Razet, Daniel; Faury, Nicole; Taillade, Sylvie. |
| Within its oyster quality project, the Marennes-Oleron Professional Organization (SRC) aims to improve the zootechnic rearing conditions in ponds for the Pacific cupped oyster C. gigas "fines de claires" and "speciales de claires", presently specified by the French norm AFNOR NF V45-056 (AFNOR, 1985). The proposed modifications concern a seasonal management of the oyster biomass per m2 , using 1 and 3kg/m2, during 2 weeks from April 1rst to October 31, and 3 weeks from November 1 to March 31, respectively. The Shellfish Aquaculture Laboratory of Poitou-Charentes (LCPC) carried out experiments to address the professional and decision-makers request for an assessment of those modifications on the final oyster quality compared to the current rearing... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassostrea gigas; Affinage; Claires ostréicoles; AFNOR NF V 45-056; Pacific Cupped oyster; Crassostrea gigas; Growth; Oyster ponds; AFNOR NF V 45-056. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00102/21325/18948.pdf |
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| Soletchnik, Patrick; Robert, Stephane. |
| Ce document s’inscrit dans le cadre de la problématique des mortalités de moules bleues sur les côtes françaises depuis l’hiver 2014. Il a été conçu comme une contribution aux projets Morbleu (projet de recherche) et Mytilobs (observatoire national sur les traits de vie de la moule). D’un point de vu historique, depuis le début du 20ème siècle, le principale « ennemi » de la moule reste la météo et en particulier, les tempêtes. Une seule crise de mortalité, majeure, est survenue en 1960-61 dans le pertuis Breton. Elle résulte d’une interaction entre le parasite mytilicola intestinalis et des conditions drastiques d’élevage sur bouchots dans la baie de l’Aiguillon. L’évaluation des mortalités de moules est difficile du fait des pratiques d’élevage et des... |
| Tipo: Text |
Palavras-chave: Mytilus edulis; Moule; Mortalité; REMOULA; MYTILOBS; Elevage; Bouchot; Reproduction environnement. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00345/45634/45263.pdf |
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| Bouchet, Vincent; Debenay, Vincent; Sauriau, Pierre-guy; Radford Knoery, Joel; Soletchnik, Patrick. |
| Sediment cores were collected from April to August 2004 on tidal mudflats of the macrotidal Marennes-Oléron Bay (SW France), famous for the cultivation of Pacific oysters (Crassostrea gigas). The response of living (stained) benthic foraminifera to short-term biogeochemical disturbances in the sediment and overlying water, which may be involved in oyster summer mortality, was monitored. Short-term hypoxia occurred in early June, in conjunction with a sudden rise in temperature. In mid-June, the ammonia content of sediment porewater increased, leading to potentially maximal flux towards overlying waters. Foraminiferal assemblages, particularly in the topmost layer, were altered. Ammonia tepida was the most tolerant to temperature increase and hypoxic... |
| Tipo: Text |
Palavras-chave: Marennes Oléron bay; Aquaculture; Crassostrea gigas; Intertidal; Ammonium; Hypoxia; Organic matter; Living benthic foraminifera. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2586.pdf |
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| Soletchnik, Patrick. |
| This study is based on catched larvae data base produced since C. gigas was first imported into the Charentais Sounds (late 1960s, early 1970s). The method for catching larvae using a towed net remained unchanged between 1950 and 1998. Four sites have been sampled in the Bay since 1970, two situated in the Seudre estuary and two in the middle of the Bay. Two other sites from near the mouth of the Charente River have been sampled since 1982. For each sample, oyster larvae were counted in four size classes, from the young larva (1-4 days) to near metamorphosis (16-20 days). Each year, 100 to 150 captures were carried out at all sample sites between June and September. Captures from July and August represent 99% of the total. The main variables were: capture... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Marennes Oléron Bassin; Pertuis Charentais; Analyse spatio temporelle; Recrutement; Saison; Larve; Ponte; Huîtrs; Reproduction. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2008/rapport-4125.pdf |
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| Registros recuperados: 168 | |
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