Bacterial Load of Trout Farm Waters in Connection with the Carrier Estate of the Fish for Zoonotic Microbes

Abstract

The health of fish raised on farms mainly depends on water quality, including the level of oxygen, its contamination with chemical or biological pollutants but also on nutrition, raising technology and management techniques. This research aimed to investigate the bacterial pollution extent of waters and fish in terms of species with zoonotic potential on a commercial trout farm. The smaller number of bacterial species isolated from fish tha from culture waters, indicated an increased pathogenicity of certain species for the corresponding species of trout. The rainbow trout seemed to be more sensitive to an increased number of pathogenic bacteria (Pseudomonas aeruginosa, E. coli, Aeromonas salmonicida, Ochrobacterium anthropi). There was an increased degree of pollution with zoonotic bacteria in culture waters for both rainbow and eastern brook trout, such as Pseudomonas aeruginosa, E. coli, Acinetobacter baumanni/calcoaceticus, Ochrobacterium anthropi, Pasteurella pneumotropica, Chrysoabacterium indoligenes, Photobacterium damselae. The isolated bacteria from both waters and fish on the farm represented a potential risk for workers and other contact categories of people.