Viral Diseases -- Egtved Virus: The Susceptibility of Brown Trout and Rainbow Trout to Eight Virus Isolates and the Significance of the Findings for the VHS Control -- Isolation of VHS Virus from Pike Fry (Esox lucius) with Hemorrhagic Symptoms -- Some Aspects of Trout Gill Structure in Relation to Egtved Virus Infection and Defence Mechanisms -- Experimental Infection of Susceptible Carp Fingerlings with Spring Viremia of Carp Virus, Under Wintering Environmental Conditions -- Spring Viremia of Carp (SVC): Studies on Immunization of Carp -- Studies on Immunization of Trout Against IPN -- Bacterial Diseases -- Experimental Vibrosis in the Eel (Anguilla anguilla) -- Laboratory and Field Observations on Antivibriosis Vaccines -- Recent Experience of Field Vaccination Trials Against Vibriosis in Rainbow Trout (Salmo gairdneri) -- Some Results of Vaccination Against Vibriosis in Brittany -- Production and Properties of a Haemolytic Toxin by Vibrio anguillarum -- Observations on Vibriosis in Cultured Flatfish -- Experimental and Naturally Occurring Furunculosis in Various Fish Species: a Comparative Study -- Seasonal Occurrence of Aeromonas salmonicida Carrers -- Examination in Resistance Tests of Some Strains of the Aeromonas hydrophila punctata Group Isolated from Carp -- Development of Bacteria in Fish and in Water During a Standardized Experimental Infection of Rainbow Trout (Salmo gairdneri) with Aeromonas salmonicida -- Studies on an Ichthyotoxic Material Produced Extracellularly by the Furunculosis Bacterium Aeromonas salmonicida -- Studies on Vaccination of Atlantic Salmon Against Furunculosis -- Further Studies on Furunculosis Vaccination -- Pathogenesis of Carp Erythrodermatitis (CE): Role of Bacterial Endo- and Exotoxin -- Examination of the CE Agent -- Some Aspects of the Histopathology of Carp Erythrodermatitis (CE) -- Erythrodermatitis of Carp: Studies of the Mode of Infection -- Emerging Problems and Approaches -- Characterization of the Causal Agents of Bacterial Kidney Disease -- Infection with an Acinetobacter-like Bacterium in Atlantic Salmon (Salmo salar) Broodfish -- "Sphaerosporosis", a New Kidney Disease of the Common Carp -- Disease in Farmed Juvenile Atlantic Salmon Caused by Dermocystidium sp. -- The Causative Agent of Proliferative Kidney Disease May Be a Member of the Haplosporidia -- Poster Section -- Preparation of Salmonid White Blood Cells for Virological Studies -- Use of Immunoperoxidase Technique for Detection of Fish Virus Antigens -- Nephrocalcinosis of Rainbow Trout (Salmo gairdneri Richardson) in Freshwater; a Survey of Affected Farms -- The Increase of Nephrocalcinosis (NC) in Rainbow Trout in Intensive Aquaculture -- Trial Vaccination of Rainbow Trout Against Aeromonas liquefaciens -- Flavobacteriosis in Coho Salmon (Oncorhynchus kisutch) -- Hemagglutination Properties of Aeromonas -- Bacterial Stress-Caused Infections of Silver Carp and Sarotherodon aureus in Fish Ponds and Their Control -- Physiological and Morphological Effects of Social Stress on the Eel, Anguilla anguilla L. -- Epitheliocystis Disease in Fishes -- Contributions to the Taxonomy of the Genus Diplozoon von Nordmann, 1832 -- Treatment of Salmon Lice (Lepeophtheirus salmonis Kroyer) with Neguvon.