Data/hora: 03/06/2024 18:12:43

Provedor de dados: | 5
País: | France
Título: | RESCO - Réseau d'observations Conchylicoles : Campagne 2013
Autores: | Fleury, Elodie.
Data: | 2014-05
Ano: | 2014
Palavras-chave: | Crassostrea gigas; Huître creuse; Mortalité; Croissance; Température; Enregistrement haute fréquence; Herpes virus; Vibrio aesturianus; Agent pathogène; Crassostrea gigas; Pacific oyster; Mortality; Growth; Temperature; High frequency data acquisition; Herpes virus; Vibrio aestuarianus; Infectious agent.
Resumo: | The French network RESCO was developed in 2009, following the widespread mortalities in French oysters stocks of Crassostrea gigas that killed a majority of young cultivated oysters in summer 2008. The main objective of this network was to develop a tool of estimation of the mortalities at national scale, through a standardized monitoring of sentinel oysters In 2013, similar batches of spat and 18 month old oysters from different origins were deployed in thirteen sites located all along the French coasts to measure the spatial and temporal evolution of the mortality and growth rates. At the same time, the program provides a high-frequency recording of environmental parameters and the detection of the main infectious agents associated to the oyster mortality. As in previous years, mortality peaks were firstly detected in the south sites with a small delay compare to 2012 due to a relatively cold spring. No general trend was observed in the evolution of summer mortality rates and significant differences of mortality patterns or intensity were measured between sites and batches. The mean cumulative mortality rate of 18 month old oysters was close to the value measured in 2012 (13%) while the mean cumulative growth rate was relatively low and tended to decrease since 2011. The cumulative mortality rate of spat ranged from 59 to 84 % which was significantly higher than the mean value calculated for the ten past years (42%). To the contrary, the spat cumulative growth rate was the lowest recorded since 2004. Significant differences in the Herpes virus (OsHV-1) concentrations were also measured between sites and batches but the final value of the cumulative mortality rate seemed to be positively correlated with the concentration of this infectious agent. Vibrio aestuarianus bacteria were sporadically detected in a few batches for either spat or 18 month old oyster without any correlation with the Herpes virus concentration.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00197/30851/29212.pdf
Relação: | http://archimer.ifremer.fr/doc/00197/30851/
Formato: | application/pdf
Fonte: | 2014 Ifremer