Abstract
The rainbow trout production increased more than 100% in the last decade and total rainbow trout production was shown as 107.013 tons
according to 2016 statics. According to Federation of European Aquaculture Producer, Turkey was determined as the biggest rainbow trout
producer into the European Countries in 2016. Together with high production capacity, a number of outbreaks were reported causing L.
anguillarum (Vibriosis). The pathogenesis of L. anguillarum which were experimentally infected in rainbow trout were examined during 15
days in our study. Spreading of agent that was injected with intraperitoneally into tissue and organs were studied by using histopathological
methods. The mortality rate of agent was determined above 70% and deaths were seen in 2-3th days of experiment. In addition of these, liver,
spleen, kidney and gills were determined as the most affected organs and tissues. In the present study was obtain for original pathological
findings of L. anguillarum.