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Registros recuperados: 76
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A herpes-like virus infects a non-ostreid bivalve species: virus replication in Ruditapes philippinarum larvae ArchiMer
Renault, Tristan; Lipart, Cecile; Arzul, Isabelle.
Sporadic high mortalities were reported in June 1997 among hatchery-reared larval Manila clam Ruditapes philippinarum in a French commercial hatchery. Cellular abnormalities were observed in semi-thin sections in affected animals. Transmission electron microscopy revealed the presence of herpes-like virus particles in larvae. This is the first description of a herpes-like virus infection in larval R. philippinarum, a non-ostreid bivalve species. Virus particles were similar to other herpes-like viruses described from different oyster species with respect to ultrastructure and morphogenesis. Electron microscopic examination also demonstrated cells with condensed chromatin and extensive perinuclear fragmentation of chromatin. Like viruses infecting oysters,...
Tipo: Text Palavras-chave: Apoptosis; Virus replication; Mortality; Ruditapes philippinarum; Manila clam; Herpes like virus.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-816.pdf
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Action des facteurs hydrologiques et sédimentaires sur le budget énergétique de la palourde japonaise Ruditapes philippiarum élevée dans un écosystème estuarien (Bassin de Marennes-Oléron, France) ArchiMer
Daou, Rafik.
Afin d'étudier l'action du sédiment sur les populations de Ruditapes philippinarum, 12 000 individus ont été répartis en 1986 sur 3 substrats dans le bassin de Marennes-Oléron. Tous les paramètres du milieu sont analysés sur les 3 sites pendant un cycle annuel parallèlement aux suivis biométriques, biochimiques et énergétiques sur les animaux. Ainsi dans ce secteur d'élevage "Les Doux" où l'influence estuarienne (Charente) est faible, les phénomènes circadiens, régissant la dynamique sédimentaire, n'affectent pas la distribution du matériel dissous. L'étude des différents fractions sestoniques au dessus de chaque parc montre qu'ils sont recouverts par la m^me masse d'eau. Par ailleurs, les effets négatifs des sédiments à fortes teneurs pélitiques sur les...
Tipo: Text Palavras-chave: Ruditapes philippinarum; Sédimentologie; Budget énergétique; Bassin de Marennes Oléron; France.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00285/39596/38088.pdf
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An evaluation of Mg/Ca, Sr/Ca, and Ba/Ca ratios as environmental proxies in aragonite bivalve shells ArchiMer
Poulain, C.; Gillikin, D. P.; Thebault, Julien; Munaron, Jean-marie; Bohn, M; Robert, Rene; Paulet, Yves-marie; Lorrain, Anne.
The influence of salinity and water chemistry on Mg/Ca, Sr/Ca and Ba/Ca ratios in the aragonitic shells of the Manila clam were investigated. Clams were reared at constant temperature (20 °C) under different controlled conditions of salinity, commonly encountered in their natural habitat. Clams were held in three tanks with a constant salinity of 35 for the first 35 days and then two tanks were changed to lower salinities (20 and 28) for the next 29 days. Individual shell Mg/Ca, Sr/Ca and Ba/Ca ratios were studied through time. Despite stable conditions (temperature, salinity, and Mg/Cawater) for clams reared at salinity 35 during the experiment, Mg/Ca shell ratios increased through the time. Moreover the salinity decrease at t35 slowed the increase of...
Tipo: Text Palavras-chave: Ruditapes philippinarum; Aragonite; Sclerochronology; Bivalved mollusk; Trace element; Proxy.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00245/35649/34158.pdf
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An infection of Ruditapes decussatus (Bivalvia) by Rickettsia ArchiMer
Mialhe, Eric; Chagot, Dominique; Boulo, Viviane; Comps, Michel; Ruano, Francisco; Grizel, Henri.
The authors report the presence of a Rickettsia in Ruditapes decussatus from natural populations of the Algarve (Portugal). Light microscopic shows infections of varying importance in gill tissues. Some enclose small procaryotic colonies (cp) scattered in all lamellae; in others, the colonies are scarce and hypertrophic (100 mu m). These different pictures suggest an amplification process. Digestive diverticulae may also be infected, but to a lesser extent. The ultrastructural features of this intravacuolar (mvd: densified vacuolar membrane) procaryote (P) and its multiplication by scission without a complex developmental cycle allows its classification in the order Rickettsiales.
Tipo: Text Palavras-chave: Ruditapes philippinarum; Pathogens; Histopathology; Pathology.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/acte-3107.pdf
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Analysis of shell colour determinism in the Manila clam Ruditapes philippinarum ArchiMer
Peignon, Jean-marie; Gerard, Andre; Naciri, Yamama; Ledu, Christophe; Phelipot, Pascal.
The Manila clam presents a large polymorphism for shell colours and patterns. No experiment has been conducted to study the determinism of such a polymorphism which has been well known for a long time. The aim of this study was firstly to determine the genetic variation for shell colour and secondly to produce some homozygous lines for the shell colouring. These lines could then be used as controls for laboratory experiments. The colouring is defined by three characters: asymmetry, ornamentation and hue. Clams with asymmetrical colouring are not fully pigmented, except for a posterior band on the left valve. Clams with symmetrical colouring are fully pigmented on the two valves. Four cross series were conducted between the different characters: Asymmetry...
Tipo: Text Palavras-chave: Mollusque; Bivalve; Palourde; Ruditapes philippinarum; Génétique; Hérédité mendélienne; Coloration; Asymétrie; Mollusc; Bivalve; Manila clam; Ruditapes philippinarum; Genetics; Mendelian inheritance; Colouration; Asymmetry.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/publication-3204.pdf
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Asari clam (Ruditapes philippinarum) in France: history of an exotic species 1972 – 2015 ArchiMer
De Montaudouin, Xavier; Arzul, Isabelle; Caill-milly, Nathalie; Khayati, Alice; Labrousse, Jean-michel; Lafitte, Céline; Paillard, Christine; Soudant, Philippe; Goulletquer, Philippe.
In 1972, France underwent an oyster (Crassostrea angulata) crisis and urgently needed to diversify its aquaculture. Thus, Asari clam (Ruditapes philippinarum) was introduced at that time for aquaculture purpose, concomitantly with the introduction of Pacific oyster (Crassostrea gigas). All Asari clam adults and spat originated from the same area (Puget Sound, WA, USA). After a promising start and the implementation of a national Research & Development program, Asari clam culture rapidly faced a series of concomitant handicaps: firstly, in spite the fact that cultural practices were optimized and locking points addressed, leasing ground availability was limited during the 1980s’ due to certain reluctance from oyster farmers to share their leases and/or...
Tipo: Text Palavras-chave: Ruditapes philippinarum; France; Aquaculture; Professional fishing; Diseases; Environmental stressors.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00366/47767/47817.pdf
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Brown muscle disease (BMD), an emergent pathology affecting Manila clam Ruditapes philippinarum in Arcachon Bay (SW France) ArchiMer
Dang, C; De Montaudouin, X; Gonzalez, P; Mesmer Duldons, N; Caill-milly, Nathalie.
We describe an emerging pathology, brown muscle disease (BMD), which specifically affects the Manila clam Ruditapes philippinarum in Arcachon Bay (France). BMD induces a transformation of the posterior adductor muscle, which becomes infused by conchiolin and calcified, reducing the ability of clams to bury. The disease affects both types of muscular tissue, with striated muscle becoming affected to a higher degree than smooth muscle. Two indices were created to quantify the symptoms: the Muscle Print Index, used for empty and live shells, and the Final Disease Index, utilized for live clams only. Histological sections were made and observed under light microscopy to examine the muscular damage and to investigate a causal agent. Sections revealed an...
Tipo: Text Palavras-chave: Light microscopy; Pathology; Adductor muscle; Ruditapes philippinarum; Clam; Brown muscle disease.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/2008/publication-4556.pdf
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Campagne d'évaluation du stock de palourdes du bassin d'Arcachon - Année 2006 ArchiMer
Caill-milly, Nathalie; Duclercq, Benoit; Morandeau, Gilles.
Between 1980 and 1986, some Arcachon oyster farmers took up breeding the Japanese clam on the foreshore (Robert et Deltreil, 1990). This production was short lived. The steep fall in prices due to economic competition from Spain, Portugal, Italy and Tunisia, predator action such as the trigger fish (Popovsky et al., 1999), added to the significant amount of mortality that occurred in the summer and autumn of 1992 that affected two-thirds of the total stock, led to clam farming being abandoned at the end of the 1980s. In the Arcachon basin, the Japanese clam (Ruditapes philippinarum) population, now natural to the area, has found favourable conditions for development and is expanding rapidly there. This species has been supplanting the local species...
Tipo: Text Palavras-chave: Ruditapes philippinarum; Veneridae; Popluation structure; Biomass; Stock assessment; Arcachon Bassin; Veneridae; Ruditapes Philippinarum; Bivalvia; Mollusca; Structure Population; Biomasse; Abondance; Evaluation Stock.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/rapport-2218.pdf
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Caractérisation moléculaire du parasite du genre Perkinsus infectant les palourdes en France et étude du polymorphisme génétique en fonction de son origine géographique ArchiMer
Michel, Justine.
En 2004 et 2005, une étude menée par le REPAMO (Réseau de Pathologie des Mollusques) a montré que des parasites du genre Perkinsus étaient présentas au sein des principaux domaines français de production de palourdes: La Mer Méditerranée, l'Océan Atlantique et la Manche avec une forte prévalence amis aucun cas de mortalités associées. Cependant, ces résultats doivent être complétés par des analyses moléculaires plus spécifiques de façon à déterminer la ou les espèces de Perkinsus détectés. D'autre, part, l'étude a montré que différents facteurs environnementaux (température, salinité...) liés à la répartition géographique influencent le développement de parasite. Ces résultats suggèrent l'existence d'une variabilité génétique chez le ou les parasites du...
Tipo: Text Palavras-chave: Parasite; Perkinsus; PCR; Ruditapes decussatus; Ruditapes philippinarum; Variabilité génétique.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00033/14453/11754.pdf
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Comparaison de la respiration chez Ruditapes decussatus (L.) et R. philippinarum (Adams & Reeve) en fonction de la température ArchiMer
Bodoy, Alain; Riva, Alain; Maitre-allain, Thierry.
Measurements of oxygen consumption in the two species Ruditapes decussatus and Ruditapes phi/ippinarum were perfonned using hatchery-reared juveniles, grown under controlled conditions. The temperature range varied from 10 to 30°C. The linear relations between the logarithms of the dry weight and of the oxygen consumption were calculated for each species. Rates were compared in terms of standardized clam tissue weight calculated from the regression of respiration on tissue weight. Such a technique allows to make comparisons between the species by avoiding any interference from the variations in individual weight. Within this range of temperature, oxygen consumption of R. philippinarum and of R. decussatus exhibit the same variations, with a maximum at...
Tipo: Text Palavras-chave: Temperature; Oxygen consumption; Ruditapes philippinarum; Ruditapes decussatus; Température; Consommation oxygène; Ruditapes philippinarum; Ruditapes decussatus.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/publication-2963.pdf
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Compte-rendu des résultats d'analyses effectuées en histologie - Année 1995 ArchiMer
Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno.
Dans le cadre du Réseau zoosanitaires CEE (huître plate) et suivi d'autres espèces, 890 individus provenant des zones 5, 6 et 7 ont été examinés sur l'ensemble de l'année 1995 par différentes techniques : 472 analyses sous coupes histologiques, 328 analyses sur appositions d'organes, 90 analyses sur milieu au thioglycolate.
Tipo: Text Palavras-chave: Pathologie; Analyse; Histologie; Technique; Bivalves; Ostrea edulis; Huître plate; Mytilus edulis; Ruditapes philippinarum; Ruditapes decussatus; Cerastoderma edule; Mortalité.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15504/12877.pdf
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Contribution à l'étude de la compatibilité des élevages de palourdes en association avec des crevettes impériales ArchiMer
Ratiskol, Jacqueline; Faury, Nicole; Masson, Daniel.
La présente étude a été réalisée à la demande de la SEMDAC de Charente Maritime a fin de contribuer à la connaissance de ce phénomène dans le cas de l'élevage simultané de crevettes impériales (Penaeus japonicus) et de palourdes (Ruditapes philippinarum), Le suivi hydrologique et bactériologique des élevages a été réalisé dans des marais aménagés au voisinage de Marennes, en bordure de Seudre et alimentés en eau par des chenaux reconnus salubres.
Tipo: Text Palavras-chave: Aquaculture; Elevage; Crevette; Penaeus japonicus; Palourde; Ruditapes philippinarum; Hydrologie; Bactériologie.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00119/23073/20914.pdf
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Correlation between perkinsosis and growth in clams Ruditapes spp. ArchiMer
Dang, Cecile; De Montaudouin, Xavier; Binias, Cindy; Salvo, Flora; Caill-milly, Nathalie; Bald, Juan; Soudant, Philippe.
Perkinsosis is one of the most widespread diseases affecting commercially important species of molluscs globally. We examined the impact of Perkinsus spp. on shell growth at the individual scale in 2 clam species: Ruditapes decussatus from Mundaka Estuary (Spain) and R. philippinarum from Arcachon Bay (France). At Arcachon, 2 contrasting sites in terms of environment and Perkinsus olseni presence were chosen: Arguin (disease-free) and Ile aux Oiseaux (infected site). We monitored the dynamics of perkinsosis over the course of the experiment at Mundaka and Ile aux Oiseaux. Prevalences were high (>70%), and intensities were around 10(5) cells g(-1) wet gills at Ile aux Oiseaux, and 10(6) cells g(-1) at Mundaka. No significant differences in prevalence or...
Tipo: Text Palavras-chave: Clams; Perkinsus spp.; Perkinsus olseni; Ruditapes philippinarum; Ruditapes decussatus; Growth.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00166/27733/25951.pdf
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Croissance et reproduction de Ruditapes philippinarum (Adams & Reeve 1850) en fonction des conditions d'élevage (milieu lagunaire et claire) ArchiMer
Goulletquer, Philippe.
For a few years, we have witnessed the rapid development of Japanese clam Ruditapes philippinarum (Adams & Reeve) culture on the Atlantic coast, and especially in the Charente Maritime region. However, a number of unknown variables still exist in order to optimize oyster farms and improve their benefits. In this respect, studies have been carried out since 1975 by the Centre Océanologique de Bretagne in Tudy Island, in the Kermoor pond, in order to determine: the consequence of the immersion size on their growth, the optimal seeding period, and the survival rate. Moreover, other studies aimed to significantly reduce the production cost, focused on pre-growth length. These studies correspond to a specific environment (i.e. the semi-closed Kermoor pond)....
Tipo: Text Palavras-chave: Maturation sexuelle; Cycle gamétogénétique; Biométrie; Croissance; Ruditapes philippinarum; Palourdes.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/rapport-3843.PDF
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Determination of diet in Manila clams by spatial analysis of stable isotopes ArchiMer
Dang, C.; Sauriau, Pierre-guy; Savoye, N.; Caill-milly, Nathalie; Martinez, P.; Millaret, C.; Haure, Joel; De Montaudouin, X..
Spatial changes in the dietary regime of Ruditapes philippinarum from intertidal sediments of Arcachon Bay were depicted by analyzing stable isotope ratios in both its adductor muscles and potential trophic sources. Manila clams were collected from 50 sites in May to June 2006. Dietary reconstruction was based on the IsoSource mixing model, considering trophic enrichments of 3.5%. for carbon and 3.0%. for nitrogen, which were determined experimentally. delta C-13 and delta N-15 values, respectively, averaged -28.2 and 5.2 parts per thousand for riverine particulate organic matter (POM), -20.6 and 4.7 parts per thousand for inner bay phytoplankton, -21.0 and 5.6%. for outer bay phytoplankton, -16.8 and 4.8 parts per thousand. for microphytobenthos, -18.4...
Tipo: Text Palavras-chave: SW France; Arcachon Bay; Spatial variability; Mixing model; Trophic sources; C and N stable isotopes; Muscle; Ruditapes philippinarum.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-6886.pdf
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Development of a generic decision-support tool for identifying potentially invasive aquatic taxa: AS-ISK ArchiMer
Copp, Gordon H.; Vilizzi, Lorenzo; Tidbury, Hannah; Stebbing, Paul D.; Trakan, Ali Serham; Miossec, Laurence; Goulletquer, Philippe.
Electronic decision-support tools are now an essential component of government strate gies to battle non-native species, with taxon-specific, paper-based risk analysis schemes often being replaced by taxon-generic tools. This study reports on the development of a decision-support tool for aquatic species, the Aquatic Species Invasiveness Screening Kit (AS-ISK), which replaces five taxon-specific toolkits for amphibians, freshwater and marine fish and invertebrates (FISK, MFISK, FI-ISK, MI-ISK, Amph-ISK). Adapted from Pheloung et al.’s. Weed Risk Assessment (WRA), the “-ISK” toolkits were also “self-automated workbooks” in Excel® VisualBasic® architecture of the ’WRA. In creating AS-ISK, we incorporated the conceptual approach (questions and guidance) of...
Tipo: Text Palavras-chave: Risk analusis; Marine; Brackish; FISK; Ruditapes philippinarum.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00357/46770/46638.pdf
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Development of culture techniques for new bivalve species ArchiMer
Bodoy, Alain; Mercer, J. P..
Were are two main reasons for the development of cultivation techniques of new bivalve species. First, the risk exists that traditionally reared species may be ereadicated or severely depleted by pathogenic agents. For example the Portuguese 0yster Crassostrea angulata. disapeared from the French coasts in the early 1970's and worldwide production of the flat oyster, Oslrea edulis has been dramatically reduced by the effects of Bonamia. Secondly, in some countries production may he self-Iimiting by the size and availabilily of national and international markets and a wider species range could offer some promising new economic opportunities for aquaculturists. In particular this applies to species where there are identifiable market shortfalls.
Tipo: Text Palavras-chave: Haliotis tuberculata; Ostrea edulis; Placopecten magellanicus; Scallops; Ruditapes philippinarum; Manila clam; Molluscs; Cultivation techniques.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/publication-3033.pdf
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Diagnostic quantitatif de Perkinsus atlanticus (Apicomplexa, Perkinsea) chez les palourdes Ruditapes decussatus et Ruditapes philippinarum ArchiMer
Almeida, Manuela.
Le protozoaire parasite Perkinsus atlanticus (Azevedo, 1989) est une des causes des chutes de production de palourdes Ruditapes decussatus et R. philippinarum cultivées au Portugal, en Espagne et en Italie. Des modèles d'infection de Perkinsus ont été réalisés, par reproduction expérimentale de la maladie, pour étudier le rôle de la densité des palourdes, de la température et de la salinité sur le déroulement de la Perkinsiose. L'objectif de ce travail a été de développer une technique de diagnostic quantitative pour optimiser l'évaluation de l'intensité d'infection et détecter de faibles infections des palourdes par P. atlanticus. Le principe de cette technique consiste à cultiver tous les tissus de la palourde en milieu thioglycolate, suivi d'une lyse à...
Tipo: Text Palavras-chave: Pathologie; Protozoaire; Parasite; Perkinsus atlanticus; Bivalvia; Ruditapes decussatus; Ruditapes philippinarum; Diagnostic.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00033/14416/11710.pdf
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Digestibilité de l'algue Skeletonema costatum par la palourde japonaise Ruditapes philippinarum : éléments d'optimisation appliqués à la vénériculture intensive en marais ArchiMer
Sauriau, Pierre-guy; IFREMER - Laboratoire Ecosystèmes Conchylicoles (LEC) La Tremblade; ECOCEAN - Environnement Littoral & Marin La Rochelle.
Le présent rapport se scinde en trois volets. le premier expose la genèse de l'application à l'aquaculture intensive d'une technique employée en agriculture intensive. Le second volet s'attache à comparer les résultats des calculs de taux de digestibilité acquis, d'une part, in vitro sous des conditions de débit circulant et de type nourriture variables et, d'autre part, in situ par prélèvement des palourdes directement dans le système d'élevage. Enfin le dernier volet contient l'analyse des la distribution spatiales des colonies algales de Skeletonema costatum dans une claire ostréicole expérimentale.
Tipo: Text Palavras-chave: Vénériculture; Marais; Algue; Skeletonema costatum; Digestion; Ruditapes philippinarum; Bivalvia.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00144/25476/23629.pdf
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Diversification de la production conchylicole : cultures de palourdes sur estran (Compte rendu n°3) ArchiMer
Goulletquer, Philippe.
Since 1984, experiments have been carried out on clam Ruditapes philippinarum foreshore culture, with a one year pond pre-growth. Culture conditions are now well-known: population level with a tide coefficient of around 70 to 80, sediment of silty or fine grain size, sediment stability over the culture period-between the end of April and November. This culture possibility gives way to a diversification of production in the shellfish culture basin of Marennes-Oléron and can be used as an alternative to oyster overexploitation. Clam densities (2 kg/m²) are five times lower than oyster and the Ruditapes philippinarum filtration rate is 20% lower than that of Crassostrea gigas.
Tipo: Text Palavras-chave: Marennes Oléron; Culture en claire; Culture sur estran; Ruditapes philippinarum.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/rapport-3842.PDF
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