A mixed Bacillus gibsonii and Sphingomonas echinoides infection in cultured rainbow trout (Oncorhynchus mykiss)

Rainbow trout (Oncorhynchus mykiss) is a fish species with long history of cultivation and bacterial pathogens are limiting the success rate. The aim this study biochemical molecular identification two opportunistic detected in rainbow cultured net cages dam lake located on Kızılırmak river; revealing pathological symptoms them moribund samples; determination their antimicrobial susceptibility profile antagonistic effect probiotic-candidate strains against them. Depending results conventional bacteriologic studies, isolates recovered from internal organs samples, mixed infection case Bacillus gibsonii Sphingomonas echinoides was identified samples showing general hemorrhagic septicemia for first time trout. Despite it not possible to identify these at level using bacteriological methods, our separately showed similarities more than 99% above mentioned 16s RNA sequence analysis. that, term water quality parameter distribution monitoring studies which include tools should be carried out aquaculture sites increase culture.