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Between May and November 2007, three marine Atlantic salmon farms around Chiloé Island, Chile, reported mortalities in which affected fish presented with Caligus rogercresseyi infections and gross gill lesions characteristic of amoebic gill disease (AGD). Histological examination of the gills from affected fish confirmed the presence of AGD lesions. Trophozoites possessing one or more endosymbiotic Perkinsela amoeba-like organisms (PLOs) were observed in association with hyperplastic tissue. Further analyses were undertaken using a combination of PCR and in situ hybridization and the trophozoites were identified as Neoparamoeba perurans. Thus, our data indicate that N. perurans is a causal agent of AGD in Chile. However, it is possible that AGD was not the single cause of mortalities in the epizootics investigated here. The exceptionally high level of co-infection with Caligus rogercresseyi (maximum mean intensity 34, prevalence 100%), could have contributed to the production losses.

Item Type:	Refereed Article
Research Division:	Agricultural and Veterinary Sciences
Research Group:	Fisheries Sciences
Research Field:	Aquatic Ecosystem Studies and Stock Assessment
Objective Division:	Animal Production and Animal Primary Products
Objective Group:	Fisheries - Aquaculture
Objective Field:	Aquaculture Fin Fish (excl. Tuna)
UTAS Author:	Young, ND (Mr Neil Young)
UTAS Author:	Morrison, RN (Dr Richard Morrison)
UTAS Author:	Nowak, BF (Professor Barbara Nowak)
ID Code:	71988
Year Published:	2011
Web of Science® Times Cited:	47
Deposited By:	NC Marine Conservation and Resource Sustainability
Deposited On:	2011-08-18
Last Modified:	2017-11-03
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