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Infestation of the cupped oysters Crassostrea angulata, C. gigas and their first-generation hybrids by the copepod Myicola ostreae: differences in susceptibility and host response

Published online by Cambridge University Press:  05 March 2009

F. M. BATISTA ,
P. BOUDRY ,
A. DOS SANTOS ,
T. RENAULT  and
F. RUANO
F. M. BATISTA*
Affiliation:
Instituto Nacional de Recursos Biológicos, INRB/IPIMAR, Av. 5 de Outubro, 8700-305 Olhão, Portugal Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Largo Prof. Abel Salazar, 2, 4099-003 Porto, Portugal
P. BOUDRY
Affiliation:
Ifremer, UMR M100 Physiologie et Ecophysiologie des Mollusques marins, BP 70, 29280 Plouzané, France
A. DOS SANTOS
Affiliation:
Instituto Nacional de Recursos Biológicos, INRB/IPIMAR, Av. de Brasília, 1449-006 Lisboa, Portugal
T. RENAULT
Affiliation:
Ifremer, Laboratoire de Génétique et Pathologie (LGP), 17390 La Tremblade, France
F. RUANO
Affiliation:
Instituto Nacional de Recursos Biológicos, INRB/IPIMAR, Av. de Brasília, 1449-006 Lisboa, Portugal
*
*Corresponding author. Present address: School of Ocean Sciences, Bangor University, Menai Bridge, Gwynedd LL59 5EY, UK. E-mail: [email protected]
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Summary

We studied the prevalence and intensity of the parasitic copepod Myicola ostreae in 2 closely related oysters Crassostrea angulata and C. gigas and their F1 hybrids. The effects on host and host reaction were also analysed to better understand host-parasite relationships between copepods and bivalve molluscs. Full reciprocal crosses were carried out between C. angulata and C. gigas and the progenies were reared in the wild in Ria Formosa Lagoon (Portugal), allowing natural infestation by M. ostreae. Prevalence and intensity were significantly higher in C. angulata than in C. gigas. The parasite level of F1 hybrids was similar to C. angulata and significantly higher than in C. gigas. The results of our study support a hypothesis of dominantly inherited susceptibility to M. ostreae infestation. Moreover, copepods were observed on the gill surface of C. gigas engulfed by a capsule-like structure. Histological analyses revealed that the copepods were surrounded by a massive agglomerate of haemocyte-like cells encircled by a thin layer of fibroblast-like cells. This encapsulation response was not observed in C. angulata or in F1 hybrids. These results suggest that the differential susceptibility to M. ostreae between C. angulata and C. gigas may be ascribed to host defence factors.

Keywords

oysterscopepodshybridizationparasitismdominance inherencehost-parasite relationshiphost reactionencapsulation
Type
Research Article
Information
Parasitology , Volume 136 , Issue 5 , April 2009 , pp. 537 - 543
Copyright
Copyright © 2009 Cambridge University Press

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