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Background Bacterial infections are responsible of high economic losses in aquaculture. Mexican golden trout ( Oncorhynchus chrysogaster ) is a threatened native trout species that has been introduced in aquaculture both for species conservation and breeding for production and for which no studies of bacterial infections have been reported. Case presentation Fish from juvenile stages of Mexican golden trout showed an infectious outbreak in a farm in co-culture with rainbow trout ( Oncorhynchus mykiss ), showing external puntiform red lesions around the mouth and caudal pedunculus resembling furuncles by  Aeromonas  spp. and causing an accumulated mortality of 91%. Isolation and molecular identification of bacteria from lesions and internal organs showed the presence of  Aeromonas bestiarum ,  Aeromonas sobria ,  Plesiomonas shigelloides  and  Ichthyobodo necator  isolated from a single individual. All bacterial isolates were resistant to amoxicillin-clavulanic acid and cefazoline.  P. shigelloides  was resistant to third generation  β -lactamics. Conclusions This is the first report of coinfection by  Aeromonas bestiarum ,  Aeromonas sobria ,  Plesiomonas shigelloides  and  Ichthyobodo necator  in an individual of Mexican golden trout in co-culture with rainbow trout. Resistance to  β -lactams suggests the acquisition of genetic determinants from water contamination by human- or livestock-associated activities.

bmc veterinary research

Bacterial and parasite co-infection in Mexican golden trout (Oncorhynchus chrysogaster) by Aeromonas bestiarum, Aeromonas sobria, Plesiomonas shigelloides and Ichthyobodo necator