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Diseases of Aquatic Organisms

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DAO 78:217-223 (2008)  -  DOI:

Neoparamoeba perurans is a cosmopolitan aetiological agent of amoebic gill disease

Neil D. Young1,*, Iva Dyková2, Kevin Snekvik3, Barbara F. Nowak1, Richard N. Morrison1

1School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania and Aquafin CRC, Locked Bag 1370, Launceston, Tasmania 7250, Australia
2Institute of Parasitology, Academy of Sciences of the Czech Republic, Ceské Budeÿjovice, Czech Republic 3Washington Animal Disease Diagnostic Laboratory and Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-7034, USA

ABSTRACT: Previously we described a new member of the Neoparamoeba genus, N. perurans, and showed that it is an agent of amoebic gill disease (AGD) of Atlantic salmon Salmo salar cultured in southeast Tasmania, Australia. Given the broad distribution of cases of AGD, we were interested in extending our studies to epizootics in farmed fish from other sites around the world. Oligonucleotide probes that hybridise with the 18S rRNA of N. perurans, N. branchiphila or N. pemaquidensis were used to examine archival samples of AGD in Tasmania as well as samples obtained from 4 host fish species cultured across 6 countries. In archival samples, N. perurans was the only detectable amoeba, confirming that it has been the predominant aetiological agent of AGD in Tasmania since epizootics were first reported. N. perurans was also the exclusive agent of AGD in 4 host species across 6 countries. Together, these data show that N. perurans is a cosmopolitan agent of AGD and, therefore, of significance to the global mariculture industry.

KEY WORDS: Amoebic gill disease · Neoparamoeba perurans · In situ hybridisation · Aquaculture

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Cite this article as: Young ND, Dyková I, Snekvik K, Nowak BF, Morrison RN (2008) Neoparamoeba perurans is a cosmopolitan aetiological agent of amoebic gill disease. Dis Aquat Org 78:217-223.

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