ICES COOPERATIVE RESEARCH REPORT RAPPORT DES RECHERCHES COLLECTIVES NO. 265 Trends in important diseases affecting the culture of fish and molluscs in the ICES area 1998–2002 Prepared and edited by The Working Group on Pathology and Diseases of Marine Organisms (WGPDMO) International Council for the Exploration of the Sea Conseil International pour l’Exploration de la Mer Palægade 2–4 DK-1261 Copenhagen K Denmark February 2004 Recommended format for purposes of citation: ICES. 2004. Trends in important diseases affecting fish and molluscs in the ICES area 1998–2002. Prepared and edited by the Working Group on Pathology and Diseases of Marine Organisms. ICES Cooperative Research Report No. 265. 26 pp. https://doi.org/10.17895/ices.pub.5399 For permission to reproduce material from this ICES Cooperative Research Report, apply to the General Secretary. ISBN 87-7482-01 978-87-7482-373-5 ISSN 2707-7144 Table of Contents Section Page 1 Introduction ................................................................................................................................................................1 2 Diseases Of Farmed Fish............................................................................................................................................1 2.1 Atlantic salmon (Salmo salar).........................................................................................................................1 2.1.1 Viral diseases.....................................................................................................................................1 2.1.1.1 Infectious Salmon Anaemia (ISA) ...................................................................................1 2.1.1.1.1 Description of agent.........................................................................................1 2.1.1.1.2 Geographical distribution ................................................................................1 2.1.1.1.3 Short description of clinical signs....................................................................1 2.1.1.1.4 Indications of impact/severity at stock level....................................................1 2.1.1.1.5 Control/preventive measures ...........................................................................1 2.1.1.1.6 Temporal trends...............................................................................................2 2.1.1.1.7 Other host species............................................................................................2 2.1.1.2 Infectious Pancreatic Necrosis (IPN) ...............................................................................2 2.1.1.2.1 Description of agent.........................................................................................2 2.1.1.2.2 Geographical distribution ................................................................................2 2.1.1.2.3 Short description of clinical signs....................................................................2 2.1.1.2.4 Indications of impact/severity at stock level....................................................3 2.1.1.2.5 Control/preventive measures ...........................................................................3 2.1.1.2.6 Temporal trends...............................................................................................3 2.1.1.2.7 Other host species............................................................................................3 2.1.1.3 Salmon Pancreas Disease (SPD) ......................................................................................3 2.1.1.3.1 Description of agent.........................................................................................3 2.1.1.3.2 Geographical distribution ................................................................................3 2.1.1.3.3 Short description of clinical signs....................................................................3 2.1.1.3.4 Indications of impact/severity at stock level....................................................3 2.1.1.3.5 Control/preventive measures ...........................................................................3 2.1.1.3.6 Temporal trends...............................................................................................3 2.1.2 Bacterial diseases ..............................................................................................................................4 2.1.2.1 Vibriosis (Vibrio sp.)........................................................................................................4 2.1.2.1.1 Description of agent.........................................................................................4 2.1.2.1.2 Geographical distribution ................................................................................4 2.1.2.1.3 Short description of clinical signs....................................................................4 2.1.2.1.4 Indications of impact/severity at stock level....................................................4 2.1.2.1.5 Control/preventive measures ...........................................................................4 2.1.2.1.6 Temporal trends...............................................................................................4 2.1.2.1.7 Other host species............................................................................................5 2.1.2.2 Furunculosis (Aeromonas salmonicida) ...........................................................................5 2.1.2.2.1 Description of agent.........................................................................................5 2.1.2.2.2 Geographical distribution ................................................................................5 2.1.2.2.3 Short description of clinical signs....................................................................5 2.1.2.2.4 Indications of impact/severity at stock level....................................................5 2.1.2.2.5 Control/preventive measures ...........................................................................5 2.1.2.2.6 Temporal trends...............................................................................................5 2.1.2.2.7 Other host species............................................................................................6 2.1.2.3 Piscirickettsiosis (Piscirickettsia salmonis)......................................................................6 2.1.2.3.1 Description of agent.........................................................................................6 2.1.2.3.2 Geographical distribution ................................................................................6 2.1.2.3.3 Short description of clinical signs....................................................................6 2.1.2.3.4 Indications of impact/severity at stock level....................................................6 2.1.2.3.5 Control/preventive measures ...........................................................................6 2.1.2.3.6 Temporal trends...............................................................................................6 2.1.2.3.7 Other host species............................................................................................6 i Table of Contents Section Page 2.1.3 Parasitic diseases...............................................................................................................................7 2.1.3.1 Sea lice (Lepeophtheirus salmonis)..................................................................................7 2.1.3.1.1 Description of agent.........................................................................................7 2.1.3.1.2 Geographical distribution ................................................................................7 2.1.3.1.3 Short description of clinical signs....................................................................7 2.1.3.1.4 Indications of impact/severity at stock level....................................................7 2.1.3.1.5 Control/preventive measures ...........................................................................7 2.1.3.1.6 Temporal trends...............................................................................................8 2.1.3.1.7 Other host species............................................................................................8 2.2 Other salmonids...............................................................................................................................................8 2.2.1 Viral diseases.....................................................................................................................................8 2.2.1.1 Viral Haemorrhagic Septicaemia (VHS) ..........................................................................8 2.2.1.1.1 Description of agent.........................................................................................8 2.2.1.1.2 Geographical distribution ................................................................................8 2.2.1.1.3 Short description of clinical signs....................................................................9 2.2.1.1.4 Indications of impact/severity at stock level....................................................9 2.2.1.1.5 Control/preventive measures ...........................................................................9 2.2.1.1.6 Temporal trends...............................................................................................9 2.2.1.1.7