Journal of FisheriesSciences.com Yonar ve ark., 4(4): 287-293 (2010) Journal abbreviation: J FisheriesSciences.com 288 Abstract: A study of Acinetobacter sp. infection in some cultured rainbow trout (Oncorhynchus mykiss) in Kahramanmaras An outbreak has appeared affecting rainbow trout weighting 0.5-1 g from different fish management units in Kahramanmaras region in 2008 year. The fish were examined systematically in terms of fish diseases. Fish samples were brought Firat University Fisheries

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... culty. For this goal, isolation was made onto appropriate agar plates under sterile conditions from fish. Cultures were incubated at 24 ºC. Clinical signs at fish were observed as dark skin, exophthalmia, injured on dorsal zone, disorders on the fish body, bleeding in the base of the dorsal and tail fin. As autopsy signs in liver and kidney of fish were observed lesions. Water quality parameters such as temperature, dissolved oxygen and pH were measured. According to morphological and biochemical tests, three different bacteria isolated at farms were identifed as Acinetobacter sp. Antibiotic susceptibility tests revealed that strains were sensitive to norfloxacin and gentamicin