The Nasal Epithelium as a Route of Infection and Clinical Signs Changes, in Rainbow Trout (Oncorhynchus mykiss) Fingerlings Infected with Aeromonas spp

The genus Aeromonas is a group of bacteria that widely distributed in water bodies and belongs to the normal intestinal microbiota aquatic terrestrial animals. In present work, rainbow trout fingerlings were experimentally infected by an immersion bath with different species. Subsequently, behavior groups was observed recorded. Infected evaluated histopathology. highest percentages hyperpigmentation (18.88%) inappetence (47.7%) fish A. salmonicida, while abnormal swimming (83.33%) recorded bestiarum. histopathological findings, olfactory epithelium (50.0%) for lusitana salmonicida (41.1%)-infected fish. While, nervous system, cerebral hemispheres (31.1%) media-infected oblongata medulla (40.0%) bestiarum-infected presented percentages. Meanwhile, bestiarum have pathogenicity virulence based on findings system. Due proximity tissue, it possible infection generated species tissue are reflected behavioral changes suggest differences bacteria.