Viral diseases have
always been one of the limiting factors in the sustainability of biodiversity,
both in the aquaculture and in the natural aquatic environment. Although
viruses are thought to be to cause some diseases in fish for a long time, exact
diagnosis has not been achieved until the use of cell cultures has begun. The
viral encephalopathy and retinopathy (VER) also known as viral nervous necrosis
is considered one of the most important viral diseases in the world, especially
for marine aquaculture. The virus belonging nodaviruses is more effective on
larvae an d juvenile individuals and can also cause infection in adult forms.
In the aquaculture sector, especially in recent years has led to significant
loss and also expected to become increasingly important due to the threat of
global warming. In this review, information about this infection which is
considered to be one of the major viral diseases of fish has been presented.