Journal article
Amoebic gill disease (AGD) in Atlantic salmon (Salmo salar) farmed in Chile
PA Bustos, ND Young, MA Rozas, HM Bohle, RS Ildefonso, RN Morrison, BF Nowak
Aquaculture | ELSEVIER | Published : 2011
Abstract
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 a..
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Funding Acknowledgements
This work formed part of a project of ADL Diagnostic Chile Ltda. and received funds from Chilean Economic Development Agency (CORFO). We thank Dr David Groman (UPEI, Canada) and Dr Jeremy Carson (Department of Primary Industries, Parks, Water & Environment, Launceston, Australia) for their valuable contribution to the diagnosis of AGD in Chile. We would like to thank Ms Victoria Valdenegro for doing the statistical analyses. The monitoring of copepods was a part of Chilean salmon industry surveillance program coordinated by INTESAL (Instituto Tecnologico del Salmon). The monitoring of ISA followed "ISA Contingency Plan" developed by Sernapesca (National Fisheries Service) in August 2007 (Resolution Number 1670) and then included in the Sanitary Specific Program to ISA Surveillance and Control.