"Aquaculture, not the Internet, represents the most promising investment opportunity of the 21st Century."
- Peter Drucker, Management Expert & Economist
2014-06-24
Virus Y - a "new disease" in rainbow trout
A new disease is described in freshwater rainbow trout in Norway. A new virus is detected in diseased fish, but not yet confirmed as the causal agent of the disease.
In late August 2013 the Norwegian Veterinary Institute (NVI) received
the first case of diseased rainbow trout from a hatchery. The signs of
disease were unusual for fish at this age. The second and third cases
were submitted to the NVI during October and primo November. The most
recent hatchery affected by this disease was recorded in January 2014.
Diseased fish were sized from 30 - 100 g. One hatchery reported high
mortality in some pens. The other affected sites reported moderate
mortalities.
Diseased fish were exposed to freshwater or water with low salinity
(< 1‰). Fish from hatcheries affected by the disease were
transferred to seawater. In one case high mortality after seawater
transfer was reported, but the mortality ceased after a short period.
Two farms have experienced disease two to three months after sea
transfer. In other cases no specific problems in sea water have been
recorded.
The fish farmers involved have from a preventive
perspective and after having consulted the Norwegian Food Safety
Authority (NFSA), carried out measures to mitigate the risk of spreading
the disease.
Disease signs Sick fish show signs of circulatory failure and
may have pale viscera due to anaemia. Ascites may also be observed.
Histopathological findings are inflammation in heart- and red muscle
tissue and cellular necrosis in the liver.
Akvakultur er fisk i kultur! De skal selvfølgelig have det godt og have noget at spise. Du kan fodre fiskene ved at klikke på din mus over fiskedammen!
