Amoebic gill disease (AGD) in Atlantic salmon (Salmo salar) farmed in Chile

Between May and November 2007, three marine Atlantic salmon farms around Chilo Island, Chile, reportedmortalities in which affected fish presented with Caligus rogercresseyi infections and gross gill lesionscharacteristic of amoebic gill disease (AGD). Histological examination of the gills from affe...

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Bibliographic Details
Published in:Aquaculture
Main Authors: Bustos, PA, Young, ND, Rozas, MA, Bohle, HM, Ildefonso, RS, Morrison, RN, Nowak, BF
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Science Bv 2011
Subjects:
Agricultural and Veterinary Sciences
Fisheries Sciences
Aquatic Ecosystem Studies and Stock Assessment
Atlantic salmon
Salmo salar
Online Access:https://doi.org/10.1016/j.aquaculture.2010.11.001
http://ecite.utas.edu.au/71988
Description
Summary:Between May and November 2007, three marine Atlantic salmon farms around Chilo Island, Chile, reportedmortalities in which affected fish presented with Caligus rogercresseyi infections and gross gill lesionscharacteristic of amoebic gill disease (AGD). Histological examination of the gills from affected fish confirmedthe presence of AGD lesions. Trophozoites possessing one or more endosymbiotic Perkinsela amoeba-likeorganisms (PLOs) were observed in association with hyperplastic tissue. Further analyses were undertakenusing a combination of PCR and in situ hybridization and the trophozoites were identified as Neoparamoebaperurans. Thus, our data indicate that N. perurans is a causal agent of AGD in Chile. However, it is possible thatAGD was not the single cause of mortalities in the epizootics investigated here. The exceptionally high level ofco-infection with Caligus rogercresseyi (maximum mean intensity 34, prevalence 100%), could havecontributed to the production losses.

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