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Accumulation and depuration of hydrocarbons in the mangrove oyster Crassostrea rhizophorae ArchiMer
Delcastillo, C; Corredor, J; Morell, J.
Adult specimens of Crassostrea rhizophorae were exposed to diesel oil dispersed in seawater. The experiment consisted of a 10 days contamination period and 15 days depuration period. Oyster samples were extracted, and analysed by gas chromatography and UV fluorescence spectroscopy. The concentrations of n-alkanes, branched alkanes, unresolved complex mixture (UCM) and aromatic hydrocarbons were determined. The oysters accumulated the hydrocarbons rapidly, reaching a maximum concentration of 387.5 ug/g (wet weight). After exposure to uncontaminated seawater, the oysters were able to reduce their hydrocarbon load to 5.6 ug/g. The data indicates that C. rhizophorae is capable of preferential accumulation and depuration of hydrocarbons. Apparently, the oysters...
Tipo: Text Palavras-chave: Crassostrea rhizophorae; Bivalvia; Fluorescence spectroscopy; Gas chromatography; Oyster culture; Hydrocarbons; Marine pollution; Accumulation; Self purification.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1602.pdf
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Amelioration de la forme et de la qualite de l'huitre Crassostrea gigas Thunberg dans les claires de Marennes-Oleron. ArchiMer
Deslous-paoli, Jean-marc; Zanette, Yvan; Heral, Maurice; Masse, Henri; Garnier, Jacqueline.
The breeding of Pacific oysters Crassostra gigas, in non tidal ponds, before commercialization, brings about an improvement of the shell and of the quantity and quality of the tissues. In fact, the Berthome's indice (1978) moves from 1.36 in June to 0.68 December, and the density of the shell increases in the same time from 1.79 to 1.98. On the other hand, the percentage of tissues in the oyster is 12.4% at the end of gametogenesis and more than 9% at the end of breeding. The dry tissues are composed of 10.3 of ash, 40.3% of proteins, 12.6% of lipids and 9% of carbohydrate. 95% of the carbohydrate are glycogen. The resulting energetic values are measured to 5.10 cal-mg super(-1) of dry tissues ash free.
Tipo: Text Palavras-chave: Crassostrea gigas; Tissues; Biochemical composition; Shells; Growth; Oyster culture.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-1892.pdf
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Characterization of summer mortalities of C. gigas oyster in France in relation to environmental parameters ArchiMer
Soletchnik, Patrick; Ropert, Michel; Bedier, Edouard; Costil, K. S.; Dubois, Brice; Degremont, Lionel; Bouget, Jean-francois; Martin, Jean-louis; Enriquez-diaz, M.; Faury, Nicole; Le Moine, Olivier; Renault, Tristan; Gagnaire, Beatrice; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois.
Field characterization of summer mortality was performed in France in the frame of the Morest project. Natural and hatchery spat were compared between three oyster production areas in France. Regardless of the natural or hatchery origin, oysters died during the reproduction period after temperature reaches 19 degree C. Thus, in southern areas, temperature accelerated gametogenesis of small spat (10mm) as well as adults, and mortality appeared for the two age classes. In contrast, sexual maturation proceeded more slowly in northern where spat mortality was lower compared to 18 months old oysters. However, critical gametogenesis and temperature were not sufficient to induce mortalities, as observed in examples with stable environment. Alternatively sediment...
Tipo: Text Palavras-chave: Seasonal variation; Oyster culture; Mortality causes; Hatcheries; Gametogenesis; Environmental factors; Crassostrea gigas; Oysters.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3348.pdf
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Characterization of Vibrio isolated from Crassostrea gigas spat suffering summer mortality outbreaks (slides) ArchiMer
Gay, Melanie; Renault, Tristan; Le Roux, Frédérique.
The pathogens related to summer mortality outbreaks are a herpes virus and two bacterial strains one belonging to Vibrio splendidus biovar II and the other to Vibrio splendidus spp. However, the feature pathogen/opportunist of these strains is still unknown. Several strains belonging to the genus Vibrio have been identified as pathogen for different mollusk species. In the context of the French program Morest, experiments of cohabitation have been used to demonstrate the potential presence of a transmissible infectious agent in batches of oysters suffering from summer mortality outbreaks. More than one hundred Vibrio strains have been isolated from these experiments. These strains have been phenotypically and genotypically characterized. Their virulence...
Tipo: Text Palavras-chave: Vibrio splendidus; Vibrio lentus; Crassostrea gigas; Summer; Spat; Pathogen; Disease transmission; Oyster culture; Mortality; Microbial contamination; Oysters.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3343.pdf
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Compendium of oyster culture in Nigeria OceanDocs
Ayinla, O.A.; Ansa, E.J.; Edun, O.M.; Bekibele, D.O.; Ogori, K.T..
Tipo: Book Palavras-chave: Oyster culture.
Ano: 2011 URL: http://hdl.handle.net/1834/5336
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Composition of biofouling communities on suspended oyster cultures: an in situ study of their interactions with the water column ArchiMer
Mazouni, Nabila; Gaertner, J; Deslous-paoli, Jean-marc.
This study was based on in situ experiments conducted in a shellfish lagoon (Thau, France) to determine the interactions between suspended oyster Crassostrea gigas Thunberg cultures and their environment at a seasonal scale. Three groups of descriptors were considered simultaneously during the course of the study: the taxonomic composition of an oyster culture unit (OCU), the nutrient and oxygen exchanges at the OCU-water interface (fluxes) and the water-column characteristics (water). We used a multiple factorial analysis (MFA) to assess in a single reference frame: (1) the seasonal organisation of the taxonomic groups which compose the OCU and (2) the interactions between this multispecific assemblage and the water column. We found strong seasonal...
Tipo: Text Palavras-chave: Ascidians; Fluxes; Multicompartment approach; Biofouling; Oyster culture.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/1996/publication-809.pdf
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Contribution aux recherches ecologiques sur les claires a huitres du bassin de Marennes-Oleron ArchiMer
Moreau, Jean.
Tipo: Text Palavras-chave: Ecology; Biology; Navicula ostrearia B.; Diatoms; Water quality; Oyster pond; Oyster culture.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-2231.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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Cultivos de moluscos bivalvos OceanDocs
Pascual, M.S.; Zampatti, E.A..
Bivalve culture in Argentina is beginning to develop commercially. Research was carried out at the North Patagonian gulfs (San Matias, San Jose and Nuevo)and focused three native species: the tehuelche scallop Aequipecten tehuelchus, the puelche oyster Ostrea puelchana and the common mussel Mytilus edulis platensis. Results achieved on each of these three species were different. In the case of scallops, the development of commercial aquaculture did not seem promising for many years due to the fact that production was sustained by natural populations: the dredge fishery of the San Matias Gulf and the diving fishery of the San Jose Gulf. Preliminary culture experiments dealt with larval fixation on artificial collectors and growth to commercial size on...
Tipo: Book Section Palavras-chave: Aquaculture economics; Aquaculture development; Aquaculture systems; Hatcheries; Seed collection; Clam culture; Oyster culture; Scallop culture; Mussel culture; Hatcheries; Seed collection; Oyster culture; Http://aims.fao.org/aos/agrovoc/c_3503; Http://aims.fao.org/aos/agrovoc/c_6930; Http://aims.fao.org/aos/agrovoc/c_5483.
Ano: 1998 URL: http://hdl.handle.net/1834/2580
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Developpement des veligeres de Crassostrea gigas dans le bassin d'Arcachon. Etudes sur les mortalites larvaires. ArchiMer
His, Edouard; Robert, Rene.
Experiments in the hatchery rearing of C. gigas larvae showed that: the antifouling paints represent a real danger for spatting areas; the larvae of Arcachon breeding stocks grown in the seawater taken from the Bay develop normally in the laboratory; and, the growth of the larvae, collected from the Bay of Arcachon and reared in hatchery at 18 degree C, confirms that the last summer temperature regimes could not explain the abnormalities. It also confirms the good quality of the seawater of the bay for C. gigas reproduction.
Tipo: Text Palavras-chave: Crassostrea gigas; Bivalvia; Environmental effects; Veligers; Oyster culture.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/publication-1835.pdf
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Effect of ionizing radiation onVibrio bacteria in Crassostrea virginica (American oyster) ArchiMer
Eberiel, D; Dooley, K; Langton, L; Malleth, J.
The presence of Vibrio bacteria in raw shellfish poses a significant health hazard to the consuming public. These human pathogens are natural, seasonal components of the microbial flora of shellfish which can result in primary septicemic or diarrheal fatal infections. Existing shellfish depuration neither targets nor eliminates the Vibrio bacteria. For this reason, additional purification processes are necessary. In this study, the effect of low dose gamma radiation on the inactivation ofVibrio cholerae (01 and non 01) and vulnificus is investigated. Log decrement (D10) values ranging only to a high of 0.09 KGy in the Vibrio strains support the hypothesis that food irradiation technology can provide an additional effective and efficient shellfish...
Tipo: Text Palavras-chave: USA Coasts; USA; Vibrio vulnificus; Vibrio cholerae; Crassostrea virginica; Bivalvia; Vibrio; Bacteria; Self purification; Marine molluscs; Irradiation; Gamma radiation; Ionizing radiation; Oyster culture.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1619.pdf
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Effects of temperature abuse on survival ofVibrio vulnificus in oysters ArchiMer
Murphy, S; Oliver, J.
Of the several bacterial diseases which may result from consumption of shellfish, those caused by marine bacteria of the genus Vibrio are the most abundant. In the United States, up to 10,000 non-fatal cases per year are estimated to be caused by the various members of this genus. More than 95% of all deaths in the United States which result from seafood consumption are caused by a single bacterium, Vibrio vulnificus. The bacterium is a normal inhabitant of estuarine waters, and occurs naturally in especially high numbers in molluscan shellfish. Infections following consuption of raw or undercooked shellfish, especially oysters, result in fatality rates of over 60%. Because most oysters in the United States are transported large distances before marketing,...
Tipo: Text Palavras-chave: USA Coasts; Vibrio cholerae; Vibrio vulnificus; Crassostrea virginica; Bivalvia; Bacteria; Temperature effects; Food technology; Fish poisoning; Oyster culture.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1622.pdf
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Estudios Comparativos para la Determinación de la Edad de Juvenilesde la Madreperla Pinctada Mazatlanica (HANLEY, 1856) Colectados en la Bahía de La Paz, B.C.S. OceanDocs
Lee, P..
La ostra perlera Pinctada mazatlanica pertenece a la familia Pteriidae la cual tiene la habilidad de producir perlas. Sus perlas y nácar de alta calidad las ha convierte en un recurso natural de preferencia para su explotación. Desafortunadamente muchos aspectos de la determinación de la edad son pobre a pesar de ser un aspecto importante para su manejo pesquero. El desarrollo larvario puede durar de 23-25 días antes de fijación dependiente de la temperatura, salinidad, disponibilidad de alimento y substrato. Las marcas de crecimiento en la prodisoconcha y la disoconcha podrían representar el crecimiento diario de la larva y el juvenil, sin embargo su validación sustentaría la determinación de la edad que puede luego ser aplicado a modelos matemáticos....
Tipo: Theses and Dissertations Palavras-chave: Oyster culture; Pearl oysters; Oyster culture; Http://aims.fao.org/aos/agrovoc/c_5483.
Ano: 2010 URL: http://hdl.handle.net/1834/3645
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Etude de la croissance du naissain d'huitres (Crassostrea gigas, Ostrea edulis) de la métamorphose à la taille de 1 mm. en fonction de différentes nourritures phytoplanctoniques. ArchiMer
Le Borgne, Y; Diss-mengus, B; Marin, J.
Introduction: Among the problems found in mollusc hatcheries, the feeding of growing post larvae is of primary concern. It is therefore essential to reach algal production rationalisation through precise knowledge of the nutritional requirements of the different species of spat produced, and this for a diversity of size classes. Many authors, such as HARTMAN and EPIFANIO (1973), PRUDER and al. (1976), have attempted to establish appropriate food rations in laboratory for various post larvae mollusks according to their average weight. However, it is difficult to adapt those results to hatchery experiments, since raising conditions and yield issues are totally different. The purpose of this work is to determine nutritional rations required for different post...
Tipo: Text Palavras-chave: Crassostrea gigas; Ostrea edulis; Artificial feeding; Oyster culture; Food composition.
Ano: 1978 URL: http://archimer.ifremer.fr/doc/1978/rapport-1758.pdf
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Etude Sédimentaire Appliquée à l'Aquaculture pour Cinq Estrans de Bretagne Sud (Morbihan et Loire Atlantique). ArchiMer
Lemoine, Gérard.
Within the national molluscan monitoring network, a sedimentary study was carried out on five experimental sites located in southern Brittany (i.e., from Etel to Pen-Bé rivers). The study aimed to specify sediment integrating characteristics with regards to hydrobiological variables. Moreover, interactions between sediment and water column characteristics were specified. It appears that this approach is likely unappropriate to characterize interdical rearing area productivity. However, this approach can support the site evaluation on a long term basis to sustain shellfish culture management. This would require additional study to assess sediment reactivity to abnormal events like drastic salinity decrease.
Tipo: Text Palavras-chave: Sédiment; Ostréiculture; Estran; Phosphore; Eutrophisation; Sediment; Oyster culture; Intertidal area; Phosphorus; Eutrophication.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00102/21344/18967.pdf
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Evaluation des Risques dus a l'emploi des Peintures Anti-Salissures Dansales Zones Conchylicoles. ArchiMer
Alzieu, Claude; Thibaud, Yves; Heral, Maurice; Boutier, Bernard.
The boats cruising in the oyster growing areas are protected against biofouling by paints which release toxic compounds such as copper oxide and organotins into the water. After an estimation of the inputs of copper and organotins in the "Marennes-Oleron", Arcachon (Atlantic) and Thau (Mediterranean Sea) areas, their influence on larval fixation is discussed, taking into account the tributyltin toxicity against D larvae of Crassostrea gigas. Laboratory experiments have demonstrated that tributyltin produces morphological abnormalities of the shell and increases tin levels in tissues, interfering with copper and zinc metabolism. The influence of yacht ports on oyster growth and shell morphology, has been demonstrated in the field. The use of...
Tipo: Text Palavras-chave: Crassostrea gigas; Oyster culture; Abnormalities; Shells; Growth; Paints; Antifouling substances; Pollution effects.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1905.pdf
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Genetic and reproduction strategy in Crassostrea gigas mortality ArchiMer
Moal, Jeanne; Bedier, Edouard; Fleury, Pierre-gildas; Langlade, Aime; Le Coguic, Yvette; Degremont, Lionel; Boudry, Pierre; Le Coz, Jean-rene; Pouvreau, Stephane; Enriquez-diaz, M.; Lambert, Christophe; Quere, Christele; Soudant, Philippe; Samain, Jean-francois.
Bi-parental families were produced in hatchery and tested in the field in 2001. Two sets of 5 families were constituted, selected on their high (R) and low (S) survival. These two sets were reared in Brittany from March to November 2002. Samplings were performed twice a month to obtain data on biometry, survival, reproductive cycle, biochemical composition, adenylate energy charge, hemolymph parameters (ions and defense system) and muscle strength. "R" and "S" oysters exhibited different reproductive effort and spawning strategy. "R" oysters allocated less energy in gonad than "S" ones and presented a complete spawning at the end of August contrary to the "S" which spawns partially. Mortality started in July when the seawater temperature reached 19 degree...
Tipo: Text Palavras-chave: Summer; Reproduction; Oyster culture; Mortality; Genetic diversity; Commercial species; Breeding.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3345.pdf
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Genetic basis of summer mortality in juvenile cupped oysters ArchiMer
Degremont, Lionel; Boudry, Pierre; Bedier, Edouard; Ropert, Michel; Soletchnik, Patrick; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois.
The French project "Morest", coordinated by IFREMER, aims to understand the causes of the summer mortalities in Crassostrea gigas. In 2001, three sets of families were bred following a nested half-sib mating design. 17 half-sib families (HSF) were obtained in this first generation (G1) and reared in 3 sites. Significant differences in survival were observed among HSF, and some HSF showed high levels of mortality in all sites, clearly indicating a genetic basis for survival. In 2002, a second generation (G2), including divergent selection and inbred lines, was constituted. Monitoring of survival and growth of G2s were the same as in 2001. Significant differences in survival were found between the offspring of the "high" and "low" selected groups and between...
Tipo: Text Palavras-chave: Summer; Oyster culture; Juveniles mortality; Genetics; Commercial species; Breeding.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3346.pdf
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Impact of the reproduction dynamics on genetic variation in the European flat oyster Ostrea edulis ArchiMer
Lapegue, Sylvie; Taris, Nicolas; Lallias, Delphine; Bonhomme, Francois; Boudry, Pierre.
The European flat oyster (Ostrea edulis L.) is a marine bivalve whose natural geographical distribution ranges along the European Atlantic coast from Norway to Morocco, in addition to the Mediterranean and Black Sea. The latest results obtained on the genetic differentiation between these populations have led us to pursue studies at a finer scale, in order to estimate the effective number of breeders and the temporal dynamics of reproduction and, more specially, recruitment. Several experiments were performed to document (1) the variance in allele frequencies during a natural settlement period; (2) the paternal contribution to fertilization by analyzing larvae sampled at the brooding stage within individual females; (3) the variance of individual...
Tipo: Text Palavras-chave: Ostrea edulis; Oyster; Sexual reproduction; Population dynamics; Oyster culture; Inbreeding; Heterosis; Genetic isolation; Genetic diversity; Breeding success; Biological fertilization.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-3436.pdf
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Incorporation of different fatty acids, supplied as emulsions or liposomes, in the polar and neutral lipids of <i>Crassostrea gigas</i> spat OMA
Caers, M.; Coutteau, P.; Sorgeloos, P..
Pacific oysters spat (<i>Crassostrea gigas</i>) were fed an algal diet (<i>Tetraselmis suecica</i>) whether or not supplemented with emulsions or liposomes rich in 18:1<i>n</i>-9, 18:2<i>n</i>-6 and 22:6<i>n</i>-3. The preferential accumulation and partitioning of the latter fatty acids between the polar and neutral lipids of <i>C. gigas</i> spat were followed. Additionally, the efficiency of emulsions and liposomes as fatty acid carriers for <i>C. gigas</i> spat were compared. The incorporation of dietary fatty acids was found to vary substantially according to the fatty acid carrier (emulsions vs. liposomes), the particular fatty acid (18:1<i>n</i>-9,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fatty acids; Feeding experiments; Larval development; Lipids; Liposomes; Liposomes; Oyster culture; Polyunsaturated fatty acids; Spat; Crassostrea gigas [Portuguese oyster].
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3512
Registros recuperados: 45
Primeira ... 123 ... Última
 

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