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| Registros recuperados: 44 | |
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| Soletchnik, Patrick; Heral, Maurice; Razet, Daniel; Bougrier, Serge; Geairon, Philippe. |
| Ecophysiological study was conducted on the japanese oyster (Crassostrea gigas) reared in Marennes-Oléron bay (France), during May 1992. Most of the somatic growth of the oyster occured during that month. The measurements were achieved from a removable laboratory stated in Le Chapus for 3 days at different tide level (coefficient of 49, 57, and 88). The food conditions were monitored through a computer with a continuous record of the turbidity during aIl the tidal cycle. In spite of an important variation between the food conditions in mean seston load, from 13,5 to 54,6 mg/!, the available organic matter ranged from 3 to 4,9 mg/l. The rate of organic matter in the water ranged 22 % to 9 %. The organic selection efficiency was significantly higher for the... |
| Tipo: Text |
Palavras-chave: Energetic budget; Selection efficiency; Filtration; Crassostrea gigas; Budget énergétique; Sélection; Consommation; Crassostrea gigas. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/acte-3068.pdf |
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| His, Edouard. |
| L'introduction d'une nouvelle espèce en ostréiculture donne souvent lieu à des débats passionnés dans les milieux ostréicoles. Un exemple est donné par Charles Martin, parqueur du Bassin d'Arcachon, dans son ouvrage "Agriculteur de la mer"; il rapporte les mesures restrictives qu'avait entraînées l'introduction de l'huître portugaise à Arcachon au début du 20ème siècle. Un des arguments avancés pour expliquer les réticences était celui de la "concurrence vitale" et de la compétition sur le plan nutritionnel (filtration) entre C. angulata et Ostrea edulis: cette dernière espèce était alors seule exploitée dans le bassin. Il fallut attendre l'épizootie de 1920, qui anéantit presque totalement l'huître plate, pour que la portugaise soit définitivement admise. |
| Tipo: Text |
Palavras-chave: Ostréiculture; Crassostrea gigas; Crassostrea angulata; Filtration; Bassin Arcachon; Gironde. |
| Ano: 1970 |
URL: http://archimer.ifremer.fr/doc/00009/11978/8682.pdf |
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| Pernet, Fabrice; Lugue, Klervi; Petton, Bruno. |
| Competition between organisms interfere in host and pathogen dynamics in ways that are difficult to predict. By one side, competitors can reduce the food supply and cause nutritional stress. Such stress could further modulate the susceptibility to infection by altering immune response or metabolic rate of the host. Alternatively, competitors may trap pathogens before they reach the focal host, and therefore reduce, enhance, or have no effect on infection according to the competitor's susceptibility to the infection. To better understand how competition influences host and pathogen interactions, we experimentally assessed the relative importance of competition for pathogens and resources on the severity of a viral disease infecting the Pacific oyster... |
| Tipo: Text |
Palavras-chave: Competition; Crassostrea gigas; Disease ecology; Filtration; Ostreid herpesvirus 1; Pathogen. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00692/80375/83493.pdf |
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| Deslous Paoli, Jean-marc. |
| Dans le bassin de Marennes- Oléron , Crepidula fornicata a principalement colonisé trois secteurs (les bords du banc de Charret, le courant d'Oléron, les abords de l'Estrée) à des densités dépassant 2 500 individus au mètre carré, mais aussi présente de façon diffuse dans tout le nord du bassin. La biomasse estimée, pour les deux premiers secteurs, est d'environ 3 700 tonnes dont 1 500 tonnes ont été draguées et rejetées à terre en 1983. Il semble par ailleurs qu'il y ait un début d'infestation des gisements à Pecten maximus dans le pertuis d'Antioche. La courbe de croissance moyenne de Crepidula fornicata a été définie en fonction de l'âge (Lc = 78,79 (1 - e - 0,439(t - 0,347)) , et , du fait de la correspondance âge-position dans les associations en... |
| Tipo: Text |
Palavras-chave: Crepidula fornicata; Répartition géographique; Dynamique de population; Biodéposition; Biologie; Filtration; Bassin de Marennes Oléron. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/00092/20357/18018.pdf |
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| Martins Okechukwu Isikwue; Dept of Agric & Environmental Engineering, University of Agriculture, Makurdi, Nigeria; Jeremiah A. Ato; Dept of Agric & Environmental Engineering, Univ. of Agric Makurdi; Isaac T. Ayua; Agric. & Environmental Engineering, Univ. of Agriculture Makurdi. |
| An affordable potable water treatment unit was designed and constructed. The components were coagulation unit, sedimentation unit, slow sand filter unit, utraviolet unit and the storage unit. Filtrate from the chamber was compared with International acceptable standards. The result showed that the treatment chamber proved effective and can produce at least 100 litres of portable water per day. The physical and chemical parameters monitored were reduced to the acceptable limit by WHO (World Health Organisation), NAFDAC(National Agency for Food and Drug Administration and Control) Nigeria and Nigerian Standard for Drinking Water Quality (NSDWQ). However, coliform was not totally removed but the count was reduced by 99.4%. |
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Palavras-chave: Land and Water Management; Water Quality; Raw water; Filtration; Treatment; Potable water; Domestic usage. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2872 |
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| Soletchnik, Patrick; Razet, Daniel; Geairon, Philippe; Faury, Nicole; Goulletquer, Philippe. |
| The study of maturation and spawning of the oyster is part of a research program to investigate the summer mortalities of the oysters, Crassostrea gigas in Marennes-Oléron Bay. Four maturity stages were simultaneously obtained by diet and thermal conditioning (immature, low maturation, mature and post-spawning stages). Measurements of clearance, filtration, absorption and respiration rates allowed a calculation of the scope for growth and hence an estimation of the oyster's energetic budget at various maturity stages. Male and female oysters had similar physiological responses. The filtration rate ranged from 2.4 to 2.6 1.h(-1) at the early stages of maturation and decreased to 1.8 1.h.' during the maturity stage. Growth rate resulting from gonad... |
| Tipo: Text |
Palavras-chave: Huître; Crassostrea gigas; Conditionnement; Maturation; Filtration; Absorption; Respiration; Oyster; Crassostrea gigas; Conditioning; Maturation; Filtration; Absorption and respiration rates. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/publication-3090.pdf |
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| Fouche, Dominique; Boiron, Philippe. |
| On constate actuellement une profusion d'appareils d'aération en vente sur le marché. En même temps, il apparaît nécessaire pour les professionnels de la conchyliculture de s'équiper convenablement pour éviter l'apparition de mortalités en bassins de finition. Ceci impose donc la mise en place de suivis d'efficacité des différents systèmes utilisés, dans les conditions de travail de la profession en ce qui concerne le stockage des mollusques bivalves. Les premiers résultats permettent de classer quatre systèmes en terme d'efficacité, mais ne permettent pas encore de proposer des rythmes d'utilisation journaliers en toutes saisons. D'autres études en cours répondront à ce problème. Des résultats des mesures effectuées sur l'eau et sur les mollusques, il se... |
| Tipo: Text |
Palavras-chave: Aérateurs; Crassostrea gigas; Bassin de finition; Respiration; Filtration. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00423/53401/54273.pdf |
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| Haure, Joel; Baud, Jean-pierre; Bougrier, Serge. |
| Introducing new species for shellfish farming is essential for expanding farmers' markets and for minimising the pathological risks that endangers professional marine aquaculture activities, which traditionally rely on only one species. Ifremer's Aquaculture and Pathological Genetics (GAP) laboratory participates in the mollusc genetics network (REGEMO). Since 1989, this network has been carrying out a selection programme for resistance or tolerance to Bonamia ostreae in European flat oysters (Ostrea edulis) to revitalize cultivation of this species on a national level. |
| Tipo: Text |
Palavras-chave: Température; Oxygène; Filtration; Ostrea edulis; Allométrie. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3254.pdf |
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| Soccol,Olívio José; Botrel,Tarlei Arriel. |
| The use of water containing suspended sediments causes serious problems to irrigation systems. Choosing the right filtering system type and capacity is essential to avoid increases in operational and maintenance costs of irrigation resulting from the need for cleaning and frequent component replacing. Pre-filters, such as the hydrocyclone, are important for their significant capability of retaining particles suspended in the water. Data on hydrocyclones performance for pre-filtering of irrigation water can be found in the literature, but research data in Brazil are scarce. Therefore, four Rietema type hydrocyclones (50 mm diameter) were constructed, one with circular-end and the other three presenting rectangular-end feeding tubes. The evaluation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Filtration; Cyclones; Centrifugal separator. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200002 |
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| Registros recuperados: 44 | |
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