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Infectious disease in fish: global risk of viral hemorrhagic septicemia virus

Authors
  • Escobar, Luis E.1
  • Escobar-Dodero, Joaquin2
  • Phelps, Nicholas B. D.3, 4
  • 1 Virginia Tech, Department of Fish and Wildlife Conservation, 310 West Campus Drive, Cheatham Hall, Room 101, Blacksburg, VA, 24061, USA , Blacksburg (United States)
  • 2 Universidad Andres Bello, Facultad de Ciencias de la Vida, Santiago, Chile , Santiago (Chile)
  • 3 University of Minnesota, Minnesota Aquatic Invasive Species Research Center, St. Paul, MN, USA , St. Paul (United States)
  • 4 University of Minnesota, Department of Fisheries, Wildlife and Conservation Biology, St. Paul, MN, USA , St. Paul (United States)
Type
Published Article
Journal
Reviews in Fish Biology and Fisheries
Publisher
Springer-Verlag
Publication Date
Jun 20, 2018
Volume
28
Issue
3
Pages
637–655
Identifiers
DOI: 10.1007/s11160-018-9524-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

As the global human population continues to increase and become more industrialized, the need for safe, secure, and sustainable protein production is critical. One sector of particular importance is seafood production, where capture fishery and aquaculture industries provide 15–20% of the global protein supply. However, fish production can be severely affected by diseases. Notably, viral hemorrhagic septicemia, caused by the viral hemorrhagic septicemia virus (VHSv; Rhabdoviridae), may be one of the most devastating viral diseases of fishes worldwide. We explored the ecology and epidemiology of VHSv using an ecological niche modeling approach to identify vulnerable disease-free regions. Results showed an impressive ecological plasticity of VHSv. The virus was found in > 140 fish species in marine and freshwater ecosystems, with high diversity of lineages in Eurasia. Sub-genotypes from marine and fresh waters were ecologically similar, suggesting broad ecological niches, rather than rapid evolutive adaptation to novel environments. Ecological niche models predicted that VHSv may have favorable physical (e.g., temperature, runoff), chemical (e.g., salinity, pH, phosphate), and biotic (i.e., chlorophyll) conditions for establishing into areas with important fish industries that, so far, are believed to be disease-free (i.e., freshwater and marine ecosystems of Africa, Latin America, Australia, and inland China). The model and our review suggest fish species from the Perciformes, Salmoniformes, and Gadiformes orders are likely to be infected with VHSv in novel regions as the virus expands its range to areas predicted to be at risk. In conclusion, VHSv remains an emerging disease threat to global food security and aquatic biodiversity.

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