External & Internal Signs

Clinical signs
Clincal signs are inappetence and erratic swimming. Pathology varies with stage of the disease process, but common external signs are pallor of the gills, haemorrhage on the fin base, redness and swelling. Internally, the fish is pale due to anaemia. V. salm is transmitted through the water from fish to fish.

The characteristics of this disease, also known as Haemorrhagic Syndrome, are anaemia and haemorrhages with a generalized septicaemia, presenting large amounts of bacterial cells in the blood of moribund or recently dead fish. The haemorrhages are mainly found in the intergument surrounding the internal organs of the fish ( Poppe et al., : Egidius et al.,)

Disease reprinted courtesy of OIE Diagnostic Manual for Aquatic Animal Diseases, OIE (World Organisation for Animal Health), Paris, France.