AGD challenge model
VESO Vikan has, together with researchers from the Norwegian Veterinary Institute, established an AGD challenge model. We offer small and large scale trials where a high number of smolts can be challenged in one tank.
Amoebic Gill Disease (AGD) has been a problem in Tasmanian aquaculture for years. The disease is caused by the amoeba Paramoeba perurans, which thrives very well in high salinity sea water at increasing temperatures. During the last years outbreaks have been reported in Ireland and Scotland, and also along the Norwegian coastline.
To face this problem, VESO Vikan has established a challenge model for AGD. Through close collaboration with the Norwegian Veterinary Institute, we are able to cultivate the amoeba and have successfully infected salmon smolts in experimental trials. We have studied the dynamics of the challenge model at different temperatures and salinities, as well as during fresh water treatment. Large scale AGD trials with a maximum of ~4000 smolts in one tank can be conducted.
The models will be useful for basic research, and to test methods for treatment and prophylactic measures, such as functional feeds, selective breeding and vaccination.
Photo: 1) Paramoeba perurans (Terje Steinum, NVI). 2) Gills 3 weeks after experimental infection (VESO Vikan). 3) Cumulative mortality after experimental infection (VESO Vikan).