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| Soletchnik, Patrick; Le Moine, Olivier; Faury, Nicole; Razet, Daniel; Geairon, Philippe; Robert, Stephane; Goulletquer, Philippe; Taillade, Sylvie. |
| The 1999 monitoring of the C. gigas mortality rates showed a 32 to 40% loss for the on-bottom rearings located on the Ronce-Perquis oyster bank. In 1997, the averaged mortality rate varied between 23 and 29% without significant site effect. These mortality rates were ranging from 17 to 32% in 1998 with significant limited mortality rate on site 4 (17%). However, those rates were underestimated by 7 to 8%, based on our 1999 study, Actually, the spatial distribution for these rates on 2 experimental sites divided into 25 subunits demonstrated a large variability ranging from 17-37% and 22-56% for sites 1 and 2, respectively. In spite this large variability, the mortality rates results were larger on the muddy bottom site. In contrast to site 1, the oysters... |
| Tipo: Text |
Palavras-chave: Bay of Marennes Oleron; Crassostrea gigas; Reproductive effort; Biochemical composition; Growth; Sampling strategy; Mortality rates; Bassin de Marennes Oléron; Crassostrea gigas; Effort de reproduction; Composition biochimique; Croissance; Méthodologie d'estimation; Taux de mortalité. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/rapport-1641.pdf |
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| Faury, Nicole; Remoue, Sophie; Soletchnik, Patrick; Goulletquer, Philippe; Geairon, Philippe; Le Moine, Olivier; Razet, Daniel; Guilpain, Patrice; Robert, Stephane; Taillade, Sylvie. |
| This study aims to assess the broodstock origin and cultural effects on oyster summer mortality rates. Three oyster batches, two originating from the Marennes-Oléron Bay, and one from the Normandy rearing area were deployed in March 2000 on the Ronce Perquis oyster bank, on experimental site since 1996. On bottom cultured oysters were monitored until January 2001. By the end of the experiment, the cumulative mortality ranged from 51 to 58 %. Following on initial mortality rate (8.8 % to 9.3 %), oyster batches showed a critical period early July. In 15 days, mortality rate reached 13.7 %. Over the rearing period, the oyster shell growth ranged between 8.9 g and 12.7 g. The somatic gain represented 0.44-0.48 g of dry meat weight. Spawning event occured in... |
| Tipo: Text |
Palavras-chave: Taux de mortalité; Croissance; Composition biochimique; Effort de reproduction; Incorporation du glucose; Crassostrea gigas; Bassin de Marennes Oléron; Charente-Maritime; Mortality; Growth rate; Biochemical content; Glycogen synthase; Crassostrea gigas; Bay of Marennes Oleron; Charente-Maritime. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00031/14235/11511.pdf |
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