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| Registros recuperados: 103 | |
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| De Montaudouin, X.; Lucia, M.; Binias, C.; Lassudrie, Malwenn; Baudrimont, M.; Legeay, A.; Raymond, N.; Jude-lemeilleur, F.; Lambert, C.; Le Goic, N.; Garabetian, F.; Gonzalez, P.; Hegaret, Helene; Lassus, Patrick; Mehdioub, W.; Bourasseau, L.; Daffe, G.; Paul-pont, I.; Plus, Martin; Do, V. T.; Meisterhans, G.; Mesmer-dudons, N.; Caill-milly, Nathalie; Sanchez, Florence; Soudant, P.. |
| Asari (= Manila) clam, Ruditapes philippinarum, is the second bivalve mollusc in terms of production in the world and, in many coastal areas, can beget important socio-economic issues. In Europe, this species was introduced after 1973. In Arcachon Bay, after a decade of aquaculture attempt, Asari clam rapidly constituted neo-naturalized population which is now fished. However, recent studies emphasized the decline of population and individual performances. In the framework of a national project (REPAMEP), some elements of fitness, stressors and responses in Arcachon bay were measured and compared to international data (41 publications, 9 countries). The condition index (CI=flesh weight/shell weight) was the lowest among all compared sites. Variation in... |
| Tipo: Text |
Palavras-chave: Ruditapes philippinarum; Condition index; Perkinsus; Brown Muscle Disease; Element contamination; Immune system; Arcachon Bay. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00280/39123/37676.pdf |
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| Baudrimont, M.; Gonzalez, P.; Hegaret, H.; Khayati, Alice; Lassus, Patrick; Legeay, A.; De Montaudouin, Xavier; Raymond, N.; Soudant, P.; Tran, D.. |
| The originality of this project consists in the interdisciplinary approach gathering the impact of toxic phytoplankton blooms and metallic pollution on health (behaviour, stress, immunity, genetic) and disease development of the Manila clam, an economieally important species. The Manila clam Ruditapes philippinarum is the second exploited bivalve in the world. It was introduced in Arcachon bay during the 80's and is today exploited by professional fishermen (57 licences). A 50% decrease of the stock was observed during the last five years. Beyond fishing pressure, a PhD thesis identified several diseases as potential threats, like perkinsosis (=Dermo) and brown muscle disease (BMD). The project confirms the settlement of these pathologies with high... |
| Tipo: Text |
Palavras-chave: Palourde japonaise; Pathologie; Efflorescences toxiques; Interactions microbiennes; Écotoxicologie; Multistress; Manila clam; Pathology; Toxic blooms; Microbial interactions; Ecotoxicology; Multistress. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00156/26745/24825.pdf |
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| Larrazabal, Me; Lassus, Patrick; Maggi, Pierre; Bardouil, Michele. |
| A preliminary study of modern marine dinoflagellate cysts has been performed in Vilaine Bay through winters 1986, 1987 and 1989. Direct observations of muddy sand samples and most probable number (MPN) method applied to cysts have evidenced a low win ter species diversity with Spiniferites spp. and Scrippsiella sp. cysts as predominant species. Change in relative importance of maximum species diversity area from ycar to year suggests a possible action of bottom currents. A study of dormant stages of toxie dinoflagellates, genus Alexandrium and Dinophysis, has corroborated the occurrence of A. minutum cysts (IO to 30 cysts.g-I sediment) at low amounts and absence of Dinophysis sp. resting stages. More generally, comparison of cysts in sediments with summer... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00133/24472/22488.pdf |
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| Maggi, Pierre; Lassus, Patrick; Abarnou, Alain. |
| Les travaux présentés font partie d'une étude générale sur les effets probables de l'implantation des centrales nucléaires sur les organismes phytoplanctoniques marins. De grandes quantités d'eau de mer transitent par les condenseurs de ces centrales ou elles s'échauffent brutalement ; elles sont ensuite rejetées dans le milieu marin et y dissipent leurs calories. Afin de limiter la fixation des salissures biologiques, une injection de chlore est effectuée à l'entrée des condenseurs ; cette pollution chimique vient alors s'ajouter à la pollution thermique. Nous avons recherché, sur le développement de Gyrosigma spencerii, les effets : de chocs thermiques, d'injections de chlore, de l'association de ces deux traitements. |
| Tipo: Text |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-7171.pdf |
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| Lassus, Patrick; Gowland, Denis; Mckenzie, Douglas; Kelly, Kelly; Braaten, Bjoern; Marcaillou-le Baut, Claire; Blanco, Juan. |
| As early as 1999, the EUROHAB initiative reported an urgent need for research on phycotoxin accumulation, detoxification and biotransformation rates in exploited shellfish species. It also strongly recommended a second objective of developing commercial systems for the cleansing of shellfish once contaminated with toxin. As a result, EU Framework Programs and regional programs funded a series of R & D projects aiming to consolidate our understanding of contamination/detoxification pathways, together with the development of industrial scale detoxification processes and mechanisms. These studies attempted to accelerate the depuration process, for DSP in blue mussels, PSP in Pacific oysters and Manila clams, and ASP in King Scallops. Bulk culture... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00015/12575/9445.pdf |
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| Lassus, Patrick; Maggi, Pierre. |
| Le travail relaté ci-après a débuté en 1973. La partie expérimentale a duré 327 jours et a dû être intercalée entre les autres travaux en cours dans le laboratoire. De plus, elle nécessita pour chaque expérimentation l'obtention de femelles de crevettes graînées. D'où les délais qui nous ont été nécessaires pour publier ces résultats. Nous nous étions proposé de rechercher les éventuelles actions, de l'acidité et de la charge en fer de trois effluents, sur le développement larvaire d'un Crustacé. Nous avons expérimenté sur chacun des effluents en utilisant celui dont nous disposions au moment de l'expérimentation sans chercher à refaire des essais rigoureusement identiques sur les trois,vu les similitudes qui permettent une certaine extrapolation. |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00046/15759/13161.pdf |
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| Lassus, Patrick; Chomerat, Nicolas; Hess, Philipp; Nezan, Elisabeth. |
| This book updates available international databases on toxic and harmful species of phytoplankton and micro-phytobenthos. It lists regional occurrences at world-wide scale: localities, cell densities, toxicity levels in contaminated animals, human and animal poisoning, isolation of identified active molecules and toxins, documentary sources. Finally, this book addresses the geographic distributions of phycotoxin-producers from recent data. The objective is to analyze the evolution of toxic and harmful episodes over the past 30 years to identify trends, and to introduce a discussion on the reality of a time-dependent increase in the number of known species and toxins. |
| Tipo: Text |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00379/49054/49508.pdf |
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| Medhioub, Walid; Gueguen, Marielle; Lassus, Patrick; Bardouil, Michele; Truquet, Philippe; Sibat, Manoella; Nejib, Medhioub; Philippe, Soudant; Mejdeddine, Kraiem; Amzil, Zouher. |
| In the Gulf of Gabes (Tunisia, Eastern Mediterranean sea), the grooved carpet shell Ruditapes decussatus has been seen to contain persistent levels of gymnodimine (GYM) for several years. The present experimental work represents the first attempt to assess detoxification kinetics of fast-acting toxins (FAT) in marine molluscs fed specific diets of non-toxic algae (Isochrysis galbana). To find an optimal detoxification method, two experiments were performed in which clams were first fed the toxic dinoflagellate Karenia selliformis to artificially contaminate them with GYM, thus simulating the effect of natural toxic episodes. As a second step, the same clams were fed a non-toxic algae, I. galbana. to speed up the detoxification process. Changes in toxin... |
| Tipo: Text |
Palavras-chave: Ruditapes decussates; Grooved carpet shell; Karenia selliformis; Gymnodimine; Toxicity; Detoxification. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/2010/publication-7488.pdf |
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| Bardouil, Michele; Bohec, Madeleine; Bougrier, Serge; Lassus, Patrick; Truquet, Philippe. |
| An experimental flow-through system allowing determination of the feeding behaviour of individual molluscs was used to study oysters exposed to mixed diets composed of varying proportions of the diatom Thalassiosira weissflogii and two strains (toxic and nontoxic) of the dinoflagellate Alexandrium larnarense. Our results show that, when compared to a T. weissflogii unialgal diet, even a diatomltoxic dinoflagellate ratio as low in biomass as 90/10 reduced clearance rates and biodeposit production by oysters. Consumption was slightly but significantly decreased for a 50/50 diatomltoxic dinoflagellate mixture. For the toxic dinoflagellate unialgal diet, ingestion, absorption and consumption were completely inhibited. Thus, the inclusion of low amounts of... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiologie; Toxine paralysante des coquillages; Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiology; Paralytic shellfish poison. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00017/12788/9729.pdf |
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| Medhioub, Amel; Medhioub, Walid; Amzil, Zouher; Sibat, Manoella; Bardouil, Michele; Ben Neila, Idriss; Mezghani, Salah; Hamza, Asma; Lassus, Patrick. |
| Karenia selliformis strain GM94GAB was isolated in 1994 from the north of Sfax, Gabes gulf, Tunisia. This species, which produces gymnodimine (GYM) a cyclic imine, has since been responsible for chronic contamination of Tunisian clams. A study was made by culturing the microalgae oil enriched Gaillard f/2 medium. The influence of growing conditions oil toxin content was studied, examining the effects of (i) different culture Volumes (0.25 to 40 litre flasks), (ii) two temperature ranges (17-15 degrees C et 20-21 degrees C) and (iii) two salinities (36 and 44). Chemical analyses were made by mass spectrometry coupled with liquid chromatography (LC-MS/MS). Results showed that (i) the highest growth rate (0.34 +/- 0.14 div d(-1)) was obtained at 20 degrees C... |
| Tipo: Text |
Palavras-chave: Mouse bioassay; Gymnodimine; Toxicity; Growth; Karenia selliformis. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7383.pdf |
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| Masselin, Pierre; Le Saux, Jean-claude; Le Gal, Dominique; Lassus, Patrick. |
| PSP toxin levels in cultivated mussels and oysters were monitored over a one year period (1994) in two keys areas, the Morlaix and la Penzé estuaries (Northern Brittany, France).Toxins were detected by IP-HPLC and results compared to those given by the bioassay routinely used by IFREMER Coastal Laboratories. Shellfish contamination seems closely related to A. minutum occurences (the minimum concentration of cells resulting in toxin detection in mussels was 400 cells/I). Toxins were depurated rapidly initially, and subsequently at a slower rate, such that residual toxin levels were detected in mussel digestive glands three months later. Maximum toxin levels were lower than the quarantine treshold level in Morlaix river, but exceeded this level (maximum: 290... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00119/23016/20846.pdf |
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| Lassus, Patrick; Amzil, Zouher; Baron, Regis; Sechet, Veronique; Barille, Laurent; Abadie, Eric; Bardouil, Michele; Sibat, Manoella; Truquet, Philippe; Berard, Jean-baptiste; Gueguen, Marielle. |
| In October and November 2003 a bloom of the toxic dinoflagellate Alexandrium catenella was observed in the North-east zone of Thau lagoon (French Mediterranean coast). Sea water samples were collected every hours to evaluate time-related variations of phytoplankton concentrations and to compare the relative ratio of A. catenella versus other phytoplankton species during the outbreak. From these observations, trials using recirculated sea water systems were performed to: i) evaluate the physiological effects on oyster of increasing proportions of A. catenella within a mixed microalgal diet where the non-toxic diatom Thalassiosira weissflogii was present at concentration: 1500 cells ml(-1), ii) compare the effect of two temperatures (12 degrees C and 18... |
| Tipo: Text |
Palavras-chave: Mediterranean Sea; Alexandrium catenella; Toxin content; Model; Crassostrea gigas; Paralytic shellfish poisoning. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2624.pdf |
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| Gueguen, Marielle; Bardouil, Michele; Baron, Regis; Lassus, Patrick; Truquet, Philippe; Massardier, Julie; Amzil, Zouher. |
| Contamination of shellfish by paralytic shellfish poisoning ( PSP) toxins poses an economic threat to shellfish farmers. As contaminated shellfish cannot be harvested for long periods of time, it would be very useful to develop processes to optimise and shorten their detoxification. In this study, Pacific oysters Crassostrea gigas were first experimentally contaminated over a period of 13 days with a continuous flow of toxic Alexandrium minutum cultures at concentrations ranging from 150 to 200 cell ml(-1) ( toxin content after 13 days of contamination 438 mu g STX equiv. 100 g(-1) wet weight). Then, two different detoxification treatments were tested and showed detoxification rates greater than those observed in coastal environments. The first treatment... |
| Tipo: Text |
Palavras-chave: Alexandrium minutum; Crassostrea gigas; Detoxification; Inorganic matter; Organic matter; PSP; Paralytic shellfish poisoning. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3896.pdf |
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| Registros recuperados: 103 | |
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