FN Archimer Export Format
PT J
TI Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions
BT 
AF SOLETCHNIK, Patrick
   LAMBERT, Christian
   COSTIL, Katherine
AS 1:1;2:2;3:3;
FF 1:PDG-DOP-LER-LERPC;2:PDG-DOP-DCOP-AQNC;3:;
C1 IFREMER, Lab Environm Ressources Poitou Charentes, F-17390 La Tremblade, France.
   Univ Bretagne Occidentale, Inst Univ Europeen Mer, Lab Sci Environm Marin, F-29280 Plouzane, France.
   Univ Caen Basse Normandie, IFREMER, UMR, Lab Biol & Biotechnol Marine, F-14032 Caen, France.
C2 IFREMER, FRANCE
   IUEM, FRANCE
   UNIV CAEN, FRANCE
SI LA TREMBLADE
   SAINT VINCENT
SE PDG-DOP-LER-LERPC
   PDG-DOP-DCOP-AQNC
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 0.479
TC 56
UR https://archimer.ifremer.fr/doc/2005/publication-3171.pdf
LA English
DT Article
DE ;Summer mortality;Hydrology;Sediment;Marine ecosystem;Marennes Oleron Bay;Crassostrea gigas
AB The purpose of this study is to investigate summer mortality of the cupped oyster, Crassostrea gigas, in relation to culture practices in the traditional oyster production region of Marennes-Oleron (France). Four oyster rearing conditions, varying culture location ("on-" or "off-bottom"), and site depth (65% to 80% daily immersion termed "deep" or 45% to 65%, termed "shallow") were studied to compare biologic performance and maturation status of oysters, in relation to sediment and water column parameters. The most severe mortality occurred in June to July in "on-bottom" reared oysters (25%), as compared with 10% mortality in "off-bottom" cultured oysters. Oysters (shell and meat) grew significantly better when reared "off-bottom" than "on-bottom." Reproductive effort was almost double in "off-bottom" reared oysters, compared with those "on-bottom"; thus, reproduction cannot be directly related to mortality in this summer mortality event. Low glycogen content recorded for both "on" and "off-bottom" reared oysters in summer, confirmed the probable lack of food and/or the overstocking in the Marennes-Oleron Bay, but did not discriminated among culture conditions. Whatever the immersion depth ("deep" or "shallow" conditions), "on-bottom" cultured oysters were adversely affected in growth, reproductive effort, and survival suggesting a direct effect of the mud (the so called "mud effect") on the biologic performance of oysters cultured on the bottom. Data from monitoring of sediment redox potential, organic content, and ammonium release did not support hypotheses that these parameters were alone responsible for the observed differences in mortality events.
PY 2005
SO Journal of Shellfish Research
SN 0730-8000
PU The National Shellfisheries Association
VL 24
IS 1
UT 000229059200026
BP 197
EP 207
ID 3171
ER

EF