Dernière mise à jour le : 20 juin 2011

Can the protozoan parasite Bonamia ostreae infect larvae of flat oysters Ostrea edulis?

DESCRIPTION

Bonamia ostreae is an intracellular protistan parasite affecting flat oysters Ostrea edulis. It can be detected in juveniles but mortalities mainly affect oysters which are more than 2 years old. The parasite is usually observed inside haemocytes and sometimes free, notably in gill epithelia suggesting a parasite release through this organ. However, the infective form and ways of entry and release remain undetermined. Flat oysters incubate their larvae in their pallial cavity for 8–10 days before releasing them into the water column. Flat oysters in Bay of Quiberon in South Brittany (France) are known to be infected with B. ostreae since 1979 and is the most important area in France for O. edulis spat collection. Flat oysters incubating larvae were sampled in this area during summertime between 2007 and 2009. Both adults and larvae were preserved and assayed by PCR and in situ hybridisation (ISH). PCR tests revealed the presence of parasite DNA in some adults and larvae. Specific labelling could be detected by ISH in gills, digestive system, gonad and mantle in adults and in the epithelium surrounding the visceral cavity of some larvae. Our results demonstrate that larvae can be infected with B. ostreae. Larvae might thus contribute to the spread of the parasite during their planktonic life. In addition, their transfer for aquaculture purpose should be controlled especially when they are exported from infected zones.

NOTICE BIBLIOGRAPHIQUE DETAILLÉE

keyboard_arrow_right Titre : Can the protozoan parasite Bonamia ostreae infect larvae of flat oysters Ostrea edulis?
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Garcia, Celine , Francois Cyrille, Joly, Jean-pierre , Couraleau, Yann , Lerond, Sophie , Omnes, Emmanuelle , Ferrand, Sylvie , Robert, Maeva , Chollet, Bruno , Langlade Aimé, Arzul, Isabelle
keyboard_arrow_right Date de publication : 20 juin 2011
keyboard_arrow_right Editeur(s) : Elsevier
keyboard_arrow_right Tags thématiques : mollusque, santé publique, surveillance
keyboard_arrow_right Mots-clés libres : Bonamia ostreae/Flat oyster/Ostrea edulis/Transmission/Larvae/Parasite life cycle
keyboard_arrow_right Localisation : QUIBERON
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1016/j.vetpar.2011.01.060
keyboard_arrow_right Collection : Veterinary parasotology

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