Seventeen years of diagnostics in fish bacteriology at the School of Veterinary Medicine Hanover. Experiences, results and practical advice. II. Identification and differentiation of aeromonads, pseudomonads, vibrio and other oxidase positive bacteria.

The second article in the series is concerned with oxidase positive bacteri a pathogenic to fish. These represent the majority of bacterial isolates fr om fish, The genera Aeromonas, Pseudomonas, Vibrio and Pasteurella and the species Plesiomonas shigelloides are described in detail. Their importance, the disease conditions associated with them and the investigations require d to identify them are provided. Simple diagrams for the identification and differentiation of the important oxidase bacteria pathogenic to fish are g iven for interested microbiologists.