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A Listonella anguillarum infection in cultured red porgy (Pagrus pagrus)is documented for the first time in this report. The infection was identified in a commercial hatchery in the Aegean near Bodrum, Turkey. Diseased red porgy were characterized by lethargy, anorexia, fin erosion and abdominal swelling. Haemorrhagies on the operculum, fins and over the surface of the body were seen. Internally, the liver and the kidney were pale. The spleen was enlarged. Ascites in the abdominal cavity was also observed. The identification of bacterial strains isolated from the affected fish was based on morphological (Gram staining and wet-mouth preparation), physiological and biochemical tests (API 20E). Mono-Va agglutination kit was also included to confirm the identification of the isolated bacteria. The principal histological changes in this study were haemosiderosis in the spleen and kidney, a massive depletion of haemopoietic elements in the spleen, haemorrhagies in the liver, intestinal walls and under the muscle tissue.