1. Laboratory of Fish Bacteriology, Department of Preventive Veterinary Medicine, State University of Londrina, Londrina 86057-970, PR, Brazil
2. Laboratory of Animal Pathology, Department of Preventive Veterinary Medicine, State University of Londrina, Londrina 86057-970, PR, Brazil
3. Department of Preventive Veterinary Medicine and Public Health, Paranaense University, Umuarama 87502-210, PR, Brazil
4. Department of Animal Science, State University of Londrina, Londrina 86057-970, PR, Brazil