Acronym NA
Category
Aquaculture
Title Utvikling av amøbegjellesykdom (AGD) hos laks i tre oppdrettsanlegg i 2013–2014 - Development of amoebic gill disease (AGD) in salmon in three fish farms in 2013–2014 Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Tor Atle Mo Coordinator email tor-atle.mo@vetinst.no
Coordinator institution
NVI - Norwegian Veterinary Institute (Norway)
Institutions involved
NA
Start year 2013 End year 2015 Funding (€) € 241,807 Website https://www.fhf.no/prosjekter/prosjektbasen/900926/ Summary Amoebae disease (English: AGD) caused by Paramoeba perurans , was the most lethal salmon disease in Irish and Scottish farms in 2012. In general, it seems that AGD is occurring further north and there may be reason to expect that the disease will increasingly framework of the Norwegian aquaculture industry. Knowledge about disease development and the spread of infection under Norwegian conditions is deficient. The project will increase knowledge about the development of the disease AGD in salmon and how the amoeba that causes the disease is spread between the cages in a fish farm and between fish farms. The project will collaborate with an ongoing gill health project under the auspices of FHF and the Veterinary Institute, "Proliferative gill disease in salmon in the sea: Pathological, molecular biological and epidemiological studies" (FHF-900800). The main findings from the project were: 1. The AGD outbreaks lasted from September to January – February in all three fish farms. 2. Two plants had a predominance of fish with mild AGD pathology, while one plant had more pronounced findings. 3. There was a good agreement between PCR findings and histopathological findings at both individual and cage level. 4. There was not an equally good agreement between gill score and PCR / histopathology. At times, the gill score was higher than the PCR / histological findings would indicate. This may be because the debt score includes changes with a cause other than amoebae. Such "overscoring" can result in unnecessary treatments aimed at amoebae. 5. Paramoeba peruranscauses AGD in Norwegian fish farms at lower water temperatures than what has been observed in other countries. Under Norwegian conditions, it appears that salmon become infected and AGD develops at water temperatures down to 6–7 ºC. Hydrogen peroxide treatment appeared to have a short-term and / or limited effect on P. perurans and the development of AGD in September / October compared with later treatment in January / February. This may be related to infection pressure and parasite multiplication, which in turn is related to water temperature. 6. The study confirms that salinity is important for the development of AGD. Developments in salinity at a locality should be considered in relation to the necessity of carrying out chemical treatment aimed at amoebae.
Goal: follow development of gill pathology caused by Paramoeba perurans in farmed Atlantic salmon before and after treatment.
Keywords
Fish;
Cage aquaculture;
Fish health;
Open sea aquaculture;
Salmon;
Parasite;
Disease;
Marine Region
41
Norwegian Sea (27.IIa)
1
Marine Region Map
