engleski

Vibrio anguillarum ulcerative dermatitis in cage cultured sea bass (Dicentrarchus labrax)

Mariculture on the Croatian side of Adriatic Sea is among earliest established of that kind of production in the Mediterranean. The species of high market value, (sea bream and sea bass) are regularly produced on few dozens fish farms throughout our coast. Probably more than in another man bred species of animals, different pathological conditions are limiting factors in economical production of fish. Certainly vibriosis caused by V. anguillarum in its different forms, ranging from peracute septicemic attacks, until chronic granulomatos infections is one of the most important and devastating diseases in this type of production in Croatia as well as all over the world. In this work clinical behavior, pathological changes and bacteriological findings in one specific but characteristic outbreak of vibriosis cage cultured sea bass (D. labrax) are presented. At the fish farm where investigations were carried on increased and permanent morality of the market sized fish (250-350 grams) at the age of two years was observed. The affected fish swam slowly at the water surface, were separated from the lot and were reluctant to eat. On the pathoanatomical examination fish had skin discoloration, presence of the erythema on fin base and the mouth, multiple, circumscribed hemorrhages of the skin on the vent, while in more advanced cases ulcerations varying somewhat in size and depth, surrounded by a rim of fresh hemorrhage were noted as well. At histolopathological examination of those later lesions, the interruption of normal skin continuity, characterized by loss of scales and the presence of large masses of necrotic tissue debris admixed with inflammatory cell component and occasionally with varying degree of granulation tissue was seen. Bacteriological examinations of liver, kidney and spleen, yielded repeatedly Vibrio anguillarum biovar I. At the facility in question treatment with antibiogram indicated antimicrobial agent was undertaken with favorable outcome.

Vibrio anguillarum; sea bass; ulcerative dermatitis

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