Skin ulcer disease of flounder Platichthys flesus in the northern Baltic sea

摘要: Skln ulcer disease of flounder Platichthys flesus (L.) was investigated a t 7 sampling sites in the northern Baltic Sea, SW Finland, dunng 1987-1989. Disease prevalences ranged from 1 8 to 11.1 % different areas. A significant correlation established between sex, fish length and prevalence. h4ales were more affected (10 7%) than females (3.1%) larger flsh showed higher smaller ones The ulcerated'flounders vaned 19 4 2 cm. ulcers not randomly distributed on trunk They occurred mainly b l ~ n d side males eye females. Ulcers tended occur close lateral hne; females, scattered over whole trunk. Bacterial examination diseased specimens resulted isolation cytochrome oxidase-negative, atypical Aeromonas salrnonicida, primarily ulcers.