This book records contributions presented at the Third Session of the EIFAC (European Inland Fisheries Advisory Commission of the Food and Agriculture Organization of the United Nations) and OlE (Office International des Epizooties) Cooperative Programme of Research on Aquaculture (COPRAQ) Fish Diseases. The session was held at the In stitute for Zoology and Hydrobiology, Veterinary Faculty, Munich, on the 23-26 October 1979. Sponsorship of the session was by the Federal Ministry of Food Agriculture and Forest of the Federal Republic of Gennany and by the Deutsche Forschungsgemeinschaft (DFG). The EIFAC was represented by Prof. Dr. N. Fijan, Zagreb, Yugosla via, and the OlE was represented by Prof. Dr. P. Ghittino, Turin, Italy and Dr. P. de Kinkelin, Thiverval-Grignon, France. The Third COPRAQ Session brought to Munich an array of scien tists from allover the world. Over 100 participants from more than 20 countries (most were from Europe, but Australia, Canada, Egypt, Israel, Kuweit, Nepal, and USA were also represented) discussed the major problems affecting the health of cultured fish. 30 papers for the slide sections and 13 papers for the poster section were submitted. Topics included were viral, bacterial, and parasitic diseases of fish, as well as emerging problems and approaches in aquaculture.

Inhalt
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.