Salmonidae, Yersinia ruckeri - immunology, Fish Diseases - microbiology, Yersinia Infections - physiopathology, Virulence Factors, Fish Diseases - prevention & control, Yersinia ruckeri - pathogenicity, Yersinia Infections - veterinary, Yersinia Infections - prevention & control, Animals, Fish Diseases - physiopathology, Fish Diseases - immunology, Environme...