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Diseases of Aquatic Organisms

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DAO 110:135-142 (2014)  -  DOI:

Contribution to the DAO Special: 'Microcell parasites of molluscs'

Bonamiosis status in natural Ostrea puelchana beds in San Matías Gulf (Patagonia, Argentina), 14 years after an epizootic

Erica M. Oehrens Kissner1,*, María del Socorro Doldan1,2, Paula C. Zaidman1,3, Enrique M. Morsan1, Marina A. Kroeck

1LABPAT-IBMP (SENASA L-709), Instituto de Biología Marina y Pesquera ‘Almirante Storni’ (IBMPAS), Universidad Nacional del Comahue, (8520), San Antonio Oeste, Rio Negro, Argentina
2Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), IBMPAS, San Antonio Oeste, Río Negro, Argentina
3CONICET-CHUBUT, IBMPAS, San Antonio Oeste, Río Negro, Argentina
*Corresponding author:

ABSTRACT: Between 1995 and 1996, Bonamia exitiosa caused an epizootic in San Matías Gulf, Argentina, that spread from a commercial culture site of Ostrea puelchana to natural beds located at the northeastern coast of the gulf. A mortality rate of 95% was registered in cultured oysters, and oysters from natural beds were also affected. The aims of this study were to assess the parasite prevalence in oyster beds and the demographic structure 14 yr after the epizootic. Two different oyster beds were studied during 2009 and 2010. Parasite prevalence was studied related to oyster aggregation, density, sex, and oyster size. Prevalence reached 35.3% at Las Grutas and 18.9% at Banco Reparo and was proportionally associated with density. Prevalence was also associated with the type of aggregation in Banco Reparo, where carrier oysters were more infected. Infection was independent of sex category, and infected oysters were larger than the non-infected ones. Oyster density decreased markedly compared to previous studies in both beds and mean sizes were lower, while prevalence doubled. Because of the persistence of the beds in this period, disease seems to control the population structure.

KEY WORDS: Ostrea puelchana · Bonamia exitiosa · Epidemiological study · Survey of prevalence · Patagonia · Argentina

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Cite this article as: Oehrens Kissner EM, Doldan MS, Zaidman PC, Morsan EM, Kroeck MA (2014) Bonamiosis status in natural Ostrea puelchana beds in San Matías Gulf (Patagonia, Argentina), 14 years after an epizootic. Dis Aquat Org 110:135-142.

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