Determination of phenotypic,serotypic and genetic diversity and antibiotyping of Yersinia ruckeri isolated from rainbow trout [Gökkuşaǧi{dotless} alabali{dotless}klari{dotless}ndan i̇zole edilen yersinia ruckeri suşlari{dotless}ni{dotless}n fenotipik,serotipik ve genetik farkli{dotless}li{dotless}klari{dotless}ni{dotless}n belirlenmesi ve antibioyotip]

In this study,15 yersinia ruckeri isolates that had been isolated from rainbow trout farms and 2 reference strains (serotype 1 and serotype 2) were examined in terms of phenotypic,serotypic and genotypic characteristics. conventional microbiological and api 20 e tests were used to determine phenotypic characteristics of y. ruckeri isolates and it was determined that the y. ruckeri showed significantly homogenous profile by microagglutination test performed by using serotype 1 and serotype 2 immunsera,and 11 of 15 isolates were serotyped as serogroup 1 while the rest 4 were serotyped as serogroup 2. in random amplified polymorphic dna (rapd) analysis,y. ruckeri isolates were genotyped within 2 separate clusters according to 70% similarity coefficient index and it was detected that first cluster includes 2 genotypes (yr1 and yr2) and second cluster includes 3 genotypes (yr3,yr4 and yr5). furthermore,antibiotic resistance profiles of y. ruckeri strains were determined and it was found that they were resistance to florfenicol,erythromycin,oxytetracycline and trimethoprim-sulphamethoxazole which have been licensed for fish health in turkey. it is considered that findings obtained will form a basis to develop diagnosis kit and/or vaccination for y. ruckeri.