DAO 106:255-265 (2013)  -  DOI: https://doi.org/10.3354/dao02640

Correlation between perkinsosis and growth in clams Ruditapes spp.

Cécile Dang1,*, Xavier de Montaudouin2, Cindy Binias2, Flora Salvo2, Nathalie Caill-Milly3, Juan Bald4, Philippe Soudant

1The University of Queensland, School of Biological Science and Centre for Marine Science, Brisbane, Queensland 4072, Australia
2Université Bordeaux 1, CNRS, EPOC UMR 5805, Station Marine d’Arcachon, 2 rue du Pr Jolyet, 33120 Arcachon, France
3IFREMER, Laboratoire Ressources Halieutiques Aquitaine, Anglet 64600, France
4AZTI-Tecnalia, Marine Research Division, Muelle de la Herrera s/n, 20110 Pasajes (Gipuzkoa), Spain
5Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR6539, Institut Universitaire Européen de la Mer (IUEM), Université de Bretagne Occidentale (UBO), Place Nicolas Copernic, 29280 Plouzané, France

ABSTRACT: Perkinsosis is one of the most widespread diseases affecting commercially important species of molluscs globally. We examined the impact of Perkinsus spp. on shell growth at the individual scale in 2 clam species: Ruditapes decussatus from Mundaka Estuary (Spain) and R. philippinarum from Arcachon Bay (France). At Arcachon, 2 contrasting sites in terms of environment and Perkinsus olseni presence were chosen: Arguin (disease-free) and Ile aux Oiseaux (infected site). We monitored the dynamics of perkinsosis over the course of the experiment at Mundaka and Ile aux Oiseaux. Prevalences were high (>70%), and intensities were around 105 cells g-1 wet gills at Ile aux Oiseaux, and 106 cells g-1 at Mundaka. No significant differences in prevalence or intensity were observed over time. A 2 yr field growth experiment of tagged-recaptured clams was performed to determine individual clam growth rate, condition index (CI), and Perkinsus spp. infection intensity. Clams were collected at Ile aux Oiseaux and transplanted to Arguin. The growth rate was always significantly and negatively correlated with Perkinsus spp. infection, and positively correlated with CI. CI and Perkinsus spp. infection explained 19% and 7% of the variability of the growth rate at Mundaka and Ile aux Oiseaux, respectively. In experimental clams at Arguin, P. olseni infection explained 26% of the variability of the growth rate at the lower tidal level. Our results suggest that at a concentration of between 105 and 106 cells g-1, perkinsosis affects the physiological functions of the clams, highlighted by its impact on the growth rate. 


KEY WORDS: Clams · Perkinsus spp. · Perkinsus olseni · Ruditapes philippinarum · Ruditapes decussatus · Growth


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Cite this article as: Dang C, de Montaudouin X, Binias C, Salvo F, Caill-Milly N, Bald J, Soudant P (2013) Correlation between perkinsosis and growth in clams Ruditapes spp.. Dis Aquat Org 106:255-265. https://doi.org/10.3354/dao02640

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