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Lipid fractions and fatty acid compositions of microorganisms from the genera Aeromonas, Pseudomonas, and Vibrio (the family Vibrionaceae) that cause diseases of various fish species were studied. Motile aeromonads and vibrios displayed higher relative contents of membrane lipids and oleic acid and lower relative contents of storage lipids compared with nonmotile aeromonads and pseudomonads, which is connected with the activities of their movements. Nonmotile aeromonads and vibrios exhibited higher levels of polyunsaturated fatty acids and higher absolute phospholipid contents compared to motile aeromonads and pseudomonads. This is likely to be related to the host specificity of these bacteria and reflects the specific patterns of fatty acid compositions of the infected fish (salmonid and cyprinid) tissues.