ABSTRACT
Bacterial infections of salmonids occur worldwide wherever they are cultured. There is a certain mystique associated with salmonids that no other group of fish enjoys, and this is in part responsible for the extensive attention they receive from aquaculturists and pathologists. Furunculosis is one of the oldest and best known bacterial diseases of fish. It is generally considered to be a disease of salmonids but is increasingly associated with other cool and occasionally warmwater fishes. Furunculosis is classified into four categories depending upon severity: acute, subacute, chronic, or latent. Clinical signs of vibriosis are similar to those of motile Aeromonas septicemia because both cause the same type of syndrome — a hemorrhagic septicemia. Diagnosis of vibriosis is accomplished by isolation of the causative organism on general laboratory media. Cold-water vibriosis (CV), also known as "Hitra disease" and hemorrhagic syndrome, is a disease primarily of the Norwegian Atlantic salmon farming industry.
