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| Infectious Salmon Anemia outbreak | |
|---|---|
| Name | Infectious Salmon Anemia outbreak |
| Disease | Infectious salmon anemia |
| Pathogen | Orthomyxoviridae (ISAV) |
| First outbreak | 1984 |
| Location | Global (notably Norway, Canada, Chile) |
| Deaths | significant aquaculture mortalities |
| Hosts | Atlantic salmon |
Infectious Salmon Anemia outbreak An outbreak of Infectious Salmon Anemia (ISA) is an episode of widespread infection by the ISA virus affecting populations of Atlantic salmon and other salmonids, with major episodes documented in regions including Norway, Canada, and Chile. These outbreaks have shaped policy responses by institutions such as the Food and Agriculture Organization and influenced practices at corporations like Marine Harvest and consortia including Global Aquaculture Alliance. Scientific investigation has engaged laboratories at Norwegian Veterinary Institute, Public Health Agency of Canada, and universities such as University of Bergen, University of British Columbia, and University of Chile.
The ISA virus was first associated with disease events in farmed Atlantic salmon near Trondheim in Norway during the 1980s, prompting research by the Norwegian Institute of Public Health and regulatory action by the Norwegian Directorate of Fisheries. Subsequent notable outbreaks in Prince Edward Island, New Brunswick, and Newfoundland and Labrador led to interventions involving the Canadian Food Inspection Agency and collaborations with the World Organisation for Animal Health. The emergence of ISA in Chile in the late 2000s mobilized responses from the Chilean Ministry of Health and the Consejo de Rectores de las Universidades Chilenas while affecting multinational firms such as AquaChile and Blumar.
Epidemiological analyses of ISA outbreaks have been conducted by teams at Norwegian University of Science and Technology, Dalhousie University, and the Instituto de Salud Pública de Chile, comparing incidence across sites in Bergen, Tromsø, St. John's (Newfoundland and Labrador), and Puerto Montt. Outbreak patterns vary seasonally and geographically, with clustering observed near marine farms operated by companies like Cermaq and cooperative networks including Nordic Aqua Partners. Surveillance data compiled by the European Food Safety Authority and the Canadian Centre for Veterinary Biologics have been used to model spread using approaches from researchers at Imperial College London and McGill University.
The pathogen responsible belongs to the family Orthomyxoviridae and is a single-stranded RNA virus studied in virology labs at institutions such as the Pasteur Institute and the National Institutes of Health. Molecular characterization work involving teams from Scripps Institution of Oceanography and CSIRO elucidated gene segments associated with virulence, invoking comparisons with orthomyxovirus research at Johns Hopkins University and Harvard Medical School. Pathogenesis studies by investigators at University of Liverpool and University of Glasgow described lesions in the circulatory system of infected Salmo salar and immunopathology explored in collaborations with Karolinska Institutet and University of Tromsø.
Transmission studies implicate horizontal spread via seawater currents and anthropogenic movements documented by marine ecologists at Institute of Marine Research (Norway) and Fisheries and Oceans Canada, with potential mechanical vectors including shipping activity analyzed by researchers at Woods Hole Oceanographic Institution and Institute of Marine Research (Norway). The role of wild hosts such as Atlantic cod and migratory species tracked by NOAA and Icelandic Institute of Natural History has been examined alongside farm-management risk factors studied at Akvaplan-niva and University of Stirling.
Economic and production impacts were measured in affected regions by economists at University of Tromsø, University of British Columbia, and policy units at the Organization for Economic Co-operation and Development. Major producers including Mowi ASA (formerly Marine Harvest) and Cooke Aquaculture reported biomass losses prompting market reactions monitored by analysts at Bloomberg and Reuters. Fisheries management responses involved agencies such as the Norwegian Fisheries Directorate, Fisheries and Oceans Canada, and Servicio Nacional de Pesca (SERNAPESCA), while NGOs like Greenpeace and World Wildlife Fund raised concerns about ecosystem impacts.
Diagnostic development has been advanced by research groups at Veterinary Laboratories Agency (UK), Norwegian Veterinary Institute, and University of Glasgow using RT-PCR methods validated in ring trials involving European Centre for Disease Prevention and Control partners and the World Organisation for Animal Health. National reporting frameworks include mandates by the Canadian Food Inspection Agency, Norwegian Food Safety Authority, and Servicio Agrícola y Ganadero (SAG) in Chile. Data sharing initiatives have been coordinated through platforms run by the Food and Agriculture Organization and collaborative networks such as the Global Taskforce for Fish Health.
Control strategies deployed by operators and regulators include fallowing, culling, and vaccination campaigns informed by trials at AquaGen and vaccine developers like CEVA Santé Animale; biosecurity protocols were updated following guidance from World Organisation for Animal Health and demonstrations by Institute of Aquaculture (Stirling). Zoning and site relocation measures have involved planning authorities in Vestland, Prince Edward Island, and Los Lagos Region and have been litigated in forums including the Supreme Court of Norway and provincial courts in Canada.
Outbreaks precipitated job losses documented by labor studies at University of Bergen and social impacts assessed by researchers at Pontifical Catholic University of Chile and Memorial University of Newfoundland. Environmental consequences studied by teams at University of Gothenburg and University of Concepción include changes in benthic communities and potential interactions with wild salmon stocks monitored by Atlantic Salmon Federation and Fisheries and Oceans Canada. International trade disputes involving affected exports engaged entities such as the World Trade Organization and influenced certification schemes administered by the Aquaculture Stewardship Council.
Category:Fish diseases Category:Salmonella — note: related naming confusion