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Isolation of Staphylococcus hominis from Cultured Gilthead Sea Bream (Sparus aurata L.) in Antalya Bay, Turkey

In this study, a disease case caused with 15% mortality on gilthead sea bream (Sparus aurata) which was cultured in the Antalya Bay in the Mediterranean coast of Turkey was investigated in July 2015. Lethargy, loss of equilibrium, petechae on the operculums and the dorsal part of the body, pillar of the gills were recorded in the diseased fish. Internally, ascites, splenomegaly and hemorrhages on the intestinal tissue and muscle were observed. Occurrence of parasite was not detected. According to the results of phenotypical test and 16S rDNA sequencing analysis, the isolated bacterial species was identified as Staphylococcus hominis. Histopathologically, hyperplasia of primary lamellae, lamellar telangiectasia, edema and hemorrhages on the gill arch, numerous melanomacrophage centers (MMCs) in the spleen tissue, vacuoler degeneration, necrose and hemorrhages in the liver, multifocal necrosis, and numerous MMC in the kidney were determined and hemorrhages in the tunica propria region of the intestine were observed. It was determined that he isolates showed different susceptibility against antimicrobial agents.