In summer 1991 and 1992 heavy mortality was seen while the water temperature was high in Salmo salar culture at the Blacksea.

Twelve fish samples were taken from three different salmon farms and subjected to bacteriological and histopathological investigations. Twelve Vibrio anquillarum was the ethiological agent of this disease. Both histopatological and bacteriological findings showcd that it was vibriosis.