Original Abstract: L'elevage des huitres repose sur des transferts de coquillages - et donc d'agents pathogenes - entre pays, voire entre continents. Des methodes d'identification pemettent aujourd'hui de retracer cette histoire compliquee, et laissent entrevoir une meilleure protection du cheptel f...

The French mollusc production is mainly based on the Pacific cupped oyster, Crassostrea gigas. Since 1991, outbreaks of mass mortality of juveniles are reported during the summer period. These outbreaks are a major concern of oyster industry. Several studies have established given bacterial strains ...

French mollusc production is based mainly on the Pacific cupped oyster, Crassostrea gigas. Since 1991, annual mass mortality of juveniles has been reported during summer months. These recurring episodes concern professionals who fear that like Portugese oyster, C. angulata, C. gigas could in turn di...

Since 1993, significant mortality outbreaks of Penaeus stylirostris usually during winter, have been reported from grow out ponds in New Caledonia. During the mortality peaks in 1994 and 1995, moribund and apparently healthy shrimps were collected from all New Caledonian farms for bacteriological an...

Since its first description, the paramyxean parasite Marteilia refringens (Grizel et al.) has been recognised as a significant pathogen of the European flat oyster Ostrea edulis L. The existence of a complex life-cycle involving several hosts was postulated early on by many authors, although it rema...

Two cases of haplosporidian infection occurred during 1993 in Pacific oysters Crassostrea gigas from the French Atlantic coast. The localization and ultrastructure of the plasmodia are described. In situ hybridization of infected tissue sections was conducted with DNA probes for oyster-infecting hap...

The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M. refringens in French shall...

The protistan parasite Mikrocytos mackini, the causative agent of Denman Island disease in the oyster Crassostrea gigas in British Columbia, Canada, is of wide concern because it can infect other oyster species and because its life cycle, mode of transmission, and origins are unknown. PCR and fluore...

The emergence of new vibriosis in the European Atlantic coasts has been associated with mass mortalities of molluscs causing important economic losses. For example, Vibrio carchariae, a bacteria already isolated from shark, has been associated with a severe Haliotis epizooty in hatchery. In oysters,...

Gene expression Studies have opened a tremendous field of investigation in biological research over the last decades. Expression of genes is most frequently quantified by real time PCR (RT-qPCR), as this method has proven to be highly sensitive. One of the critical steps, however, in comparing trans...

Diagnosis of haemic neoplasia (HN) in the soft shell clam, Mya arenaria, is often achieved by hematocytology and histology. Since neoplastic cells display tetraploid DNA contents, haemocyte cell cycle analysis was developed for use as a diagnosis tool. The aim of this study was to assess the applica...

Original Abstract: Le protozoaire parasite Marteilia refringens est responsable d'importantes mortalites au sein des elevages d'huitres plates Ostrea edulis, et a participe a la disparition de 90% de la production depuis les annees 60. Une gestion optimale des risques de contamination des huitres pl...