engleski

Tenacibaculum maritimum isolated from sea bass (Dicentrarchus labrax) in Croatia.

TENACIBACULUM MARITIMUM ISOLATED FROM SEA BASS (DICENTRARCHUS LABRAX) IN CROATIA S. Zrnčić*, D. Oraić, I. Račić, R. Beck Croatian Veterinary Institute, Zagreb, Croatia Summary The most severe disease outbreaks in sea bass (Dicentrarchus labrax) cultivated along the eastern Adriatic coast occure during the end of winter and early spring. Fish weighing between 60 and 120 grams suffer the highest prevalence and the highest mortality rates (up to 40 %). Affected fish reveal hemorrhagies on the head, opercula, fin base and the skin lesion on the body surface such as ulcers, necrosis, frayed fins and gill necrosis. Bacteriological examination of the specimen resulted the most frequently by mixed infection with Listonella anguillarum and Tenacibaculum maritimum according to determination of morphological and biochemical properties. So far as there were several species from the genus Tenacibaculum decribed as opportunistic bacterial pathogen in sea bass and other cultivated marine species we tried to determine affiliation of our isolates by genotyping. Partial sequence of 16S rRNA gene reveals 99 % similarity with type strain of Tenacibaculum maritimum isolated in Japan (difference in single nucleotide position).

enacibaculum maritimum, Dicentrarchus labrax, disease outbreak, 16SrRNA

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