Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions
Mass mortalities of oysters were recorded in the South of the Bay of Marennes-Oleron, during spring 1988. The percentages of mortality averaged 50 % and reached up to 90 % in some areas of bottom culture. The losses were estimated to 7 800 tonnes. This paper present the results of the investigations...
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Counc. Meet. of the Int. Counc. for the Exploration of the Sea, Copenhagen (Denmark), 4-12 Oct 1990
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ftarchimer:oai:archimer.ifremer.fr:3030 2023-05-15T15:58:08+02:00 Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions Bodoy, Alain Garnier, Jacqueline Razet, Daniel Geairon, Philippe 1990-10-12 application/pdf https://archimer.ifremer.fr/doc/1990/acte-3030.pdf https://archimer.ifremer.fr/doc/00000/3030/ eng eng Counc. Meet. of the Int. Counc. for the Exploration of the Sea, Copenhagen (Denmark), 4-12 Oct 1990 https://archimer.ifremer.fr/doc/1990/acte-3030.pdf https://archimer.ifremer.fr/doc/00000/3030/ info:eu-repo/semantics/openAccess restricted use Bay of Marennes Oleron Crassostrea gigas Oysters Mortalities text Conference article info:eu-repo/semantics/conferenceObject 1990 ftarchimer 2021-09-23T20:15:01Z Mass mortalities of oysters were recorded in the South of the Bay of Marennes-Oleron, during spring 1988. The percentages of mortality averaged 50 % and reached up to 90 % in some areas of bottom culture. The losses were estimated to 7 800 tonnes. This paper present the results of the investigations carried out in several fields. Among them, pathological examination revealed that no pathogenic agent or parasitic infestation could be evoked to explain these mortalities. Analyses of pollutants were either negatives, or the concentrations were far below the toxicity levels. Climatological and hydrological observations showed that rainfalls were twice more abundant then the average, for a period of 6 months preceding the mortalities. The salinity was low and fluctuating in the area, and the temperature was warmer, then the average during the same period. Phytoplanktonic blooms were recorded only by the end of May, latter then usual. These ecological changes resulted in a poor physiological condition of the oysters, which became critical for the grounds located at the South of the bay. Both their high tidal position and low quantities of phytoplankton are characteristic of this area. The high densities of oysters in the parks were also evoked as contributing to the establishment of such critical conditions. Conference Object 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 |
Bay of Marennes Oleron Crassostrea gigas Oysters Mortalities |
spellingShingle |
Bay of Marennes Oleron Crassostrea gigas Oysters Mortalities Bodoy, Alain Garnier, Jacqueline Razet, Daniel Geairon, Philippe Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
topic_facet |
Bay of Marennes Oleron Crassostrea gigas Oysters Mortalities |
description |
Mass mortalities of oysters were recorded in the South of the Bay of Marennes-Oleron, during spring 1988. The percentages of mortality averaged 50 % and reached up to 90 % in some areas of bottom culture. The losses were estimated to 7 800 tonnes. This paper present the results of the investigations carried out in several fields. Among them, pathological examination revealed that no pathogenic agent or parasitic infestation could be evoked to explain these mortalities. Analyses of pollutants were either negatives, or the concentrations were far below the toxicity levels. Climatological and hydrological observations showed that rainfalls were twice more abundant then the average, for a period of 6 months preceding the mortalities. The salinity was low and fluctuating in the area, and the temperature was warmer, then the average during the same period. Phytoplanktonic blooms were recorded only by the end of May, latter then usual. These ecological changes resulted in a poor physiological condition of the oysters, which became critical for the grounds located at the South of the bay. Both their high tidal position and low quantities of phytoplankton are characteristic of this area. The high densities of oysters in the parks were also evoked as contributing to the establishment of such critical conditions. |
format |
Conference Object |
author |
Bodoy, Alain Garnier, Jacqueline Razet, Daniel Geairon, Philippe |
author_facet |
Bodoy, Alain Garnier, Jacqueline Razet, Daniel Geairon, Philippe |
author_sort |
Bodoy, Alain |
title |
Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
title_short |
Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
title_full |
Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
title_fullStr |
Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
title_full_unstemmed |
Mass mortalities of oysters (Crassostrea gigas) during spring 1988 in the Bay of Marennes-Oleron, related to environmental conditions |
title_sort |
mass mortalities of oysters (crassostrea gigas) during spring 1988 in the bay of marennes-oleron, related to environmental conditions |
publisher |
Counc. Meet. of the Int. Counc. for the Exploration of the Sea, Copenhagen (Denmark), 4-12 Oct 1990 |
publishDate |
1990 |
url |
https://archimer.ifremer.fr/doc/1990/acte-3030.pdf https://archimer.ifremer.fr/doc/00000/3030/ |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_relation |
https://archimer.ifremer.fr/doc/1990/acte-3030.pdf https://archimer.ifremer.fr/doc/00000/3030/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766393862129975296 |