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Can the protozoan parasite Bonamia ostreae infect larvae of flat oysters Ostrea edulis?
Arzul, I.; Langlade, A.; Chollet, B.; Robert, M.; Ferrand, S.; Omnes, E.; Lerond, S.; Couraleau, Y.; Joly, J.-P.; François, C.; Garcia, C. (2011). Can the protozoan parasite Bonamia ostreae infect larvae of flat oysters Ostrea edulis? Veterinary parasitology 179(1-3): 69-76.
In: Veterinary parasitology. ELSEVIER SCIENCE BV. ISSN 0304-4017, more
Peer reviewed article  

Available in  Authors 

    Larvae; Life cycle; Parasites; Transmission; Bonamia ostreae Pichot, Comps, Tigé, Grizel & Rabouin, 1980 [WoRMS]; Ostrea edulis Linnaeus, 1758 [WoRMS]; Marine
Author keywords
    Bonamia ostreae; Flat oyster; Ostrea edulis; Transmission; Larvae;Parasite life cycle

Authors  Top 
  • Arzul, I.
  • Langlade, A.
  • Chollet, B.
  • Robert, M.
  • Ferrand, S.
  • Omnes, E.
  • Lerond, S.
  • Couraleau, Y.
  • Joly, J.-P.
  • François, C.
  • Garcia, C.

    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.

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