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| Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Corporeau, Charlotte; Degremont, Lionel; Lagarde, Franck; Pepin, Jean-francois; Keck, Nicolas. |
| Experiments were conducted to investigate the effects of farming sites, seeding date, age of oysters, ploidy level and rearing structures on mortality, pathogens and energetic reserves of oysters Crassostrea gigas. Mortality of oysters coincided with infections involving, primarily, the ostreid herpesvirus OsHV-1 and, secondarily, bacteria of the group Vibrio splendidus, when seawater temperature was between 17 and 24°C. Mortality started in early May and lasted until late September, with an interruption in July and August when seawater temperatures rose above 24°C. Mortality varied with farming site: oysters maintained in the open Mediterranean Sea showed no mortality and OsHV-1 was occasionally detected at a low level only, while oysters maintained in... |
| Tipo: Text |
Palavras-chave: Pacific oyster; Mortality; Disease; Farming practices; Hydrodynamics; Energetic. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00086/19739/17379.pdf |
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| Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Lagarde, Franck; Fiandrino, Annie; Huvet, Arnaud; Corporeau, Charlotte; Boudry, Pierre; Quere, Claudie; Degremont, Lionel; Pepin, Jean-francois; Saulnier, Denis; Boulet, Hélène; Keck, Nicolas. |
| The objectives of this study are to increase our understanding of the mass mortality phenomena in Pacific oysters Crassostrea gigas in the Thau lagoon and to examine the effect of cultivation practises. Mortality events in 2009 and 2010 always coincide with simple or dual infections involving primarily the Herpes virus OsHV-I and secondarily the bacteria Vibrio splendidus, when seawater temperature is between 17°C and 24°C. In the Thau lagoon, mortality starts early May and last until fall with an interruption period when seawater temperature is higher than 24°C in July and August. Mortality of oysters varies as a function of zootechnical life-history, hydrodynamics and cultivation practises. First, mortality depends on whether or not oysters have been... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15404/12764.pdf |
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| Pernet, Fabrice; Lagarde, Franck; Cesmat, Ludovic; Jeannée, Nicolas; Barret, Jean; Le Gall, Patrik; Quere, Claudie; Fiandrino, Annie; Miguet, Marine; Boulet, Hélène; Keck, Nicolas; Roque D'Orbcastel, Emmanuelle. |
| Cette étude avait pour objectif principal de déterminer les facteurs explicatifs de la dynamique spatio-temporelle des surmortalités d’huîtres creuses dans la lagune de Thau. Les facteurs étudiés étaient : la pathologie (détection d’ADN appartenant à l’Ostreid herpesvirus 1 OsHV-1 et au groupe bactérien Vibrio splendidus), l’état énergétique des huîtres (triglycérides, sucres totaux et acides gras comme marqueurs trophiques), les pratiques d’élevage et l’hydrodynamique. Afin de répondre à ces objectifs, nous avons suivi la mortalité d’un lot d’huîtres sentinelles, âgé de moins d’un an, maintenu indemne de mortalité, dans lequel on ne détectait pas d’ADN appartenant à OsHV-1. Le lot a été déployé mi-mars 2011 sur 106 stations dans la lagune de Thau, où les... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00092/20355/18015.pdf |
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