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Abstract

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

Item Type:	Article
Authors/Creators:	Young, ND and Dykova, I and Snekvik, K and Nowak, BF and Morrison, RN
Keywords:	Amoebic gill disease · Neoparamoeba perurans · In situ hybridisation · Aquaculture
Journal or Publication Title:	Diseases of Aquatic Organisms
ISSN:	0177-5103
DOI / ID Number:	10.3354/dao01869
Related URLs:	http://www.int-res.com
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