FN Archimer Export Format
PT SLIDE
TI Effects of age and environment on the summer mortality in cupped oyster Crassostrea gigas during the first two years
BT 
AF DEGREMONT, Lionel
   BOUDRY, Pierre
   SOLETCHNIK, Patrick
   BEDIER, Edouard
   ROPERT, Michel
   SAMAIN, Jean-Francois
AS 1:;2:;3:;4:;5:;6:;
FF 1:PDG-DOP-DCN-AGSAE-LGP;2:PDG-DOP-DCB-PFOM-PI;3:PDG-DOP-LER-LERPC;4:PDG-DOP-LER-LERMPL;5:PDG-DOP-LER-LERN;6:PDG-DOP-DCB-PFOM-PI;
SI LA TREMBLADE
   BREST
   LA TRINITE
   PORT-EN-BESSIN
SE PDG-DOP-DCN-AGSAE-LGP
   PDG-DOP-DCB-PFOM-PI
   PDG-DOP-LER-LERPC
   PDG-DOP-LER-LERMPL
   PDG-DOP-LER-LERN
UR https://archimer.ifremer.fr/doc/2005/acte-3385.pdf
LA English
DT Slideshow
DE ;Crassostrea gigas;Spat;Spatial variations;Survival;Rearing;Mollusc culture;Marine molluscs;Environmental factors;Nursery grounds;Mortality causes;Biological age;Aquaculture techniques
AB Three successive generations were produced between 2001 and 2003 to assess to what extent genetic variability exists for survival in juvenile oysters Crassostrea gigas. For each generation, two groups were selected for their high ("R" for resistant) and low ("S" for susceptible) survival. Significant differences in mortality were observed during the first year in Riviere d'Auray (RA) (Brittany-France). However, low and similar mortality were observed for both groups, with no significant difference between groups in the first and second generation in this site, where the first summer is the critical, sensitive period with a clear age effect. In Baie des Veys (BDV) (Normandie-France), where mortalities usually mainly affect adults, mortality between groups, tested in the third generation, was low and similar during the first year, but higher mortality was observed during the second summer period, showing significant difference between groups. Additionally, both groups were also retained at our nursery (Bouin) during the first year to preserve them from field mortality pressure. These oysters were then transferred to RA and BDV during the spring. Significant differences of mortality were found between the "R" and "S" groups after the summer period. Mortality rates were lower than those observed when spat were deployed the first year in the field in RA and the opposite result was found in BDV. These findings should allow the oyster commercial industry to optimize rearing strategy according to the environment and the age of oysters in order to minimize mortality.
PY 2005
PD JUL
ID 3385
ER

EF