Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network

The wide range of data from the French Ifremer/REMORA network, collected since 1993 allow a global characterization of mortalities of 1-year old and 2-years old cupped oysters Crassostrea gigas, that are cultivated in the main French oyster areas (Fleury et al, 2003), and thus a better understanding...

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Main Authors: Fleury, Pierre-gildas, Mazurie, Joseph, Ropert, Michel, Soletchnik, Patrick, Le Coz, Florence
Format: Conference Object
Language:English
Published: Physiomar 08 Physilogical aspects of reproduction, nutrition and growth "Marine molluscs in a changing environment" 2008
Subjects:
Online Access:https://archimer.ifremer.fr/doc/2008/acte-4547.pdf
https://archimer.ifremer.fr/doc/00000/4547/
id ftarchimer:oai:archimer.ifremer.fr:4547
record_format openpolar
spelling ftarchimer:oai:archimer.ifremer.fr:4547 2023-05-15T15:58:41+02:00 Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network with complements from phytoplankton and meteorogolical data Fleury, Pierre-gildas Mazurie, Joseph Ropert, Michel Soletchnik, Patrick Le Coz, Florence 2008-09 application/pdf https://archimer.ifremer.fr/doc/2008/acte-4547.pdf https://archimer.ifremer.fr/doc/00000/4547/ eng eng Physiomar 08 Physilogical aspects of reproduction, nutrition and growth "Marine molluscs in a changing environment" https://archimer.ifremer.fr/doc/2008/acte-4547.pdf https://archimer.ifremer.fr/doc/00000/4547/ info:eu-repo/semantics/openAccess restricted use Meteorolgical factors Phytoplankton REMORA Mortalities Oysters Crassostrea gigas text Poster info:eu-repo/semantics/conferenceObject 2008 ftarchimer 2021-09-23T20:16:09Z The wide range of data from the French Ifremer/REMORA network, collected since 1993 allow a global characterization of mortalities of 1-year old and 2-years old cupped oysters Crassostrea gigas, that are cultivated in the main French oyster areas (Fleury et al, 2003), and thus a better understanding of the causes of these mortalities (Ifremer /MOREST project). The average annual mortalities on intertidal sites range from 10 to 20%. Most of the mortalities take place in Spring and Summer. 1-year oyster mortalities occur in Marennes and several sites in Brittany whilst 2-years oyster mortalities occur in the same sites and in baie des Veys (Normandy). In addition, 2-years oyster mortalities appear more variable according to different annual surveys. Internal (physiological) factors and external (environmental) factors have been considered successively. A Principal Component Analysis (PCA) on seasonal mortalities, growths and gonad maturations showed that, at the time scale of the REMORA monitoring (seasonal data), no strong correlation can be set up between mortalities and growth or maturation. 2-factors ANOVAs (Sites and Years) on the Spring+Summer mortalities differentiated the variance weights of these factors according to the year-class of animals : the site effect was slightly higher (51%) for the 1-year class, whereas the year effect was higher (74%) for the 2-years class. This was reinforced by the result of another PCA that included meteorological and environmental data such as rain, sun, air and water temperature and chlorophyll a, which displayed that the 1-year oyster mortalities were the most correlated (even if not significantly) with chlorophyll a and temperature (which are site dependant), whereas the 2-years oyster mortalities had a closer correlation to the rain (year dependent). In conclusion, this survey reveals more clearly the effect of external factors than internal ones on oysters mortalities. It also reveals that the causes of mortality may be somewhat different for 1-year oysters (preponderance of geographical factors) than 2-years oysters (meteorological factors). (Soletchnik et al, 2007). References : Fleury P.G., Le Ber E., Claude S., Cornette F., d'Amico F., Guilpain P., Palvadeau H., Robert S., Le Gall P., Ropert M., Simonne C. & Vercelli C., 2003. Comparison of Pacific oyster (Cr. gigas) rearing results (survival, growth, quality) in French farming areas : a 10-years monitoring (1993-2002) of the network Ifremer /REMORA. 95th Annual meeting of the National Shellfisheries Association, New-Orleans (U.S.A.), 13-17 Avril 2003. Soletchnick P., Ropert M., Mazurié J., Fleury P.G. & Le Coz F., 2007. Relationships between oyster mortality patterns and environmental data from monitoring networks along the coasts of France. Aquaculture 271,1-4: 384-400 Conference Object Crassostrea gigas Pacific oyster Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Orleans ENVELOPE(-60.667,-60.667,-63.950,-63.950) Pacific
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 Meteorolgical factors
Phytoplankton
REMORA
Mortalities
Oysters
Crassostrea gigas
spellingShingle Meteorolgical factors
Phytoplankton
REMORA
Mortalities
Oysters
Crassostrea gigas
Fleury, Pierre-gildas
Mazurie, Joseph
Ropert, Michel
Soletchnik, Patrick
Le Coz, Florence
Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
topic_facet Meteorolgical factors
Phytoplankton
REMORA
Mortalities
Oysters
Crassostrea gigas
description The wide range of data from the French Ifremer/REMORA network, collected since 1993 allow a global characterization of mortalities of 1-year old and 2-years old cupped oysters Crassostrea gigas, that are cultivated in the main French oyster areas (Fleury et al, 2003), and thus a better understanding of the causes of these mortalities (Ifremer /MOREST project). The average annual mortalities on intertidal sites range from 10 to 20%. Most of the mortalities take place in Spring and Summer. 1-year oyster mortalities occur in Marennes and several sites in Brittany whilst 2-years oyster mortalities occur in the same sites and in baie des Veys (Normandy). In addition, 2-years oyster mortalities appear more variable according to different annual surveys. Internal (physiological) factors and external (environmental) factors have been considered successively. A Principal Component Analysis (PCA) on seasonal mortalities, growths and gonad maturations showed that, at the time scale of the REMORA monitoring (seasonal data), no strong correlation can be set up between mortalities and growth or maturation. 2-factors ANOVAs (Sites and Years) on the Spring+Summer mortalities differentiated the variance weights of these factors according to the year-class of animals : the site effect was slightly higher (51%) for the 1-year class, whereas the year effect was higher (74%) for the 2-years class. This was reinforced by the result of another PCA that included meteorological and environmental data such as rain, sun, air and water temperature and chlorophyll a, which displayed that the 1-year oyster mortalities were the most correlated (even if not significantly) with chlorophyll a and temperature (which are site dependant), whereas the 2-years oyster mortalities had a closer correlation to the rain (year dependent). In conclusion, this survey reveals more clearly the effect of external factors than internal ones on oysters mortalities. It also reveals that the causes of mortality may be somewhat different for 1-year oysters (preponderance of geographical factors) than 2-years oysters (meteorological factors). (Soletchnik et al, 2007). References : Fleury P.G., Le Ber E., Claude S., Cornette F., d'Amico F., Guilpain P., Palvadeau H., Robert S., Le Gall P., Ropert M., Simonne C. & Vercelli C., 2003. Comparison of Pacific oyster (Cr. gigas) rearing results (survival, growth, quality) in French farming areas : a 10-years monitoring (1993-2002) of the network Ifremer /REMORA. 95th Annual meeting of the National Shellfisheries Association, New-Orleans (U.S.A.), 13-17 Avril 2003. Soletchnick P., Ropert M., Mazurié J., Fleury P.G. & Le Coz F., 2007. Relationships between oyster mortality patterns and environmental data from monitoring networks along the coasts of France. Aquaculture 271,1-4: 384-400
format Conference Object
author Fleury, Pierre-gildas
Mazurie, Joseph
Ropert, Michel
Soletchnik, Patrick
Le Coz, Florence
author_facet Fleury, Pierre-gildas
Mazurie, Joseph
Ropert, Michel
Soletchnik, Patrick
Le Coz, Florence
author_sort Fleury, Pierre-gildas
title Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
title_short Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
title_full Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
title_fullStr Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
title_full_unstemmed Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network
title_sort characterization of cr. gigas oysters mortalities according to the french ifremer/remora monitoring network
publisher Physiomar 08 Physilogical aspects of reproduction, nutrition and growth "Marine molluscs in a changing environment"
publishDate 2008
url https://archimer.ifremer.fr/doc/2008/acte-4547.pdf
https://archimer.ifremer.fr/doc/00000/4547/
long_lat ENVELOPE(-60.667,-60.667,-63.950,-63.950)
geographic Orleans
Pacific
geographic_facet Orleans
Pacific
genre Crassostrea gigas
Pacific oyster
genre_facet Crassostrea gigas
Pacific oyster
op_relation https://archimer.ifremer.fr/doc/2008/acte-4547.pdf
https://archimer.ifremer.fr/doc/00000/4547/
op_rights info:eu-repo/semantics/openAccess
restricted use
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