Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions
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-botto...
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ftarchimer:oai:archimer.ifremer.fr:3171 2023-05-15T15:57:47+02:00 Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions Soletchnik, Patrick Lambert, Christian Costil, Katherine 2005 application/pdf https://archimer.ifremer.fr/doc/2005/publication-3171.pdf https://archimer.ifremer.fr/doc/00000/3171/ eng eng The National Shellfisheries Association https://archimer.ifremer.fr/doc/2005/publication-3171.pdf https://archimer.ifremer.fr/doc/00000/3171/ 2005 National Shellfisheries Association info:eu-repo/semantics/openAccess restricted use Journal of Shellfish Research (0730-8000) (The National Shellfisheries Association), 2005 , Vol. 24 , N. 1 , P. 197-207 Summer mortality Hydrology Sediment Marine ecosystem Marennes Oleron Bay Crassostrea gigas text Publication info:eu-repo/semantics/article 2005 ftarchimer 2021-09-23T20:15:08Z 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. Article in Journal/Newspaper Crassostrea gigas Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Summer mortality Hydrology Sediment Marine ecosystem Marennes Oleron Bay Crassostrea gigas |
spellingShingle |
Summer mortality Hydrology Sediment Marine ecosystem Marennes Oleron Bay Crassostrea gigas Soletchnik, Patrick Lambert, Christian Costil, Katherine Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
topic_facet |
Summer mortality Hydrology Sediment Marine ecosystem Marennes Oleron Bay Crassostrea gigas |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Soletchnik, Patrick Lambert, Christian Costil, Katherine |
author_facet |
Soletchnik, Patrick Lambert, Christian Costil, Katherine |
author_sort |
Soletchnik, Patrick |
title |
Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
title_short |
Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
title_full |
Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
title_fullStr |
Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
title_full_unstemmed |
Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions |
title_sort |
summer mortality of crassostrea gigas (thunberg) in relation to environmental rearing conditions |
publisher |
The National Shellfisheries Association |
publishDate |
2005 |
url |
https://archimer.ifremer.fr/doc/2005/publication-3171.pdf https://archimer.ifremer.fr/doc/00000/3171/ |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Journal of Shellfish Research (0730-8000) (The National Shellfisheries Association), 2005 , Vol. 24 , N. 1 , P. 197-207 |
op_relation |
https://archimer.ifremer.fr/doc/2005/publication-3171.pdf https://archimer.ifremer.fr/doc/00000/3171/ |
op_rights |
2005 National Shellfisheries Association info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766393476104060928 |