Definition of sanitary boundaries to prevent ISAv spread between salmon farms in southern Chile based on numerical simulations of currents

The infectious Salmon Anemia virus (ISAv) is a pathogen that mainly affects the Atlantic Salmon (Salmo salar). It was detected in Norway in 1984 and in June 2007 appeared in Chile, producing a drop of more than 30% in the country's production level. It is expected that with certain regularity,...

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Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 2015-06, Vol.158, p.31-39
Main Authors: Olivares, Gonzalo, Sepúlveda, H.H., Yannicelli, B.
Format: Article
Language:English
Subjects:
Atlantic Salmon
Boundaries
Chile
Computer simulation
Dispersions
Infectious salmon anemia virus
ISAv
Marine
Mathematical models
numerical model
Outbreaks
Salmo salar
Salmon
sanitary boundaries
spread
Tides
Transport
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Summary:The infectious Salmon Anemia virus (ISAv) is a pathogen that mainly affects the Atlantic Salmon (Salmo salar). It was detected in Norway in 1984 and in June 2007 appeared in Chile, producing a drop of more than 30% in the country's production level. It is expected that with certain regularity, outbreaks will continue to appear in Chile without the need of reintroducing the virus from foreign countries. We present a numerical study of the influence of winds and tides in the dispersion of lagrangian particles to simulate the transport of ISAv in the Aysen region, in southern Chile. This study combines the use of numerical models of the ocean and atmosphere, lagrangian tracking and biological aspects of ISAv infections. As in previous results, a wider dispersion of ISAv was observed during spring tides. Temporal changes in wind significantly modified the transport of viral particles from an infected center. Under similar forcing conditions, the areas of risk associated to culture sites separated by a few kilometers could be very different. Our main results remark the importance of the use of a detailed knowledge of hydrographic and atmospheric circulation in the definition of boundaries for sanitary management areas. We suggest that a methodology similar to the one presented in this study should be considered to define sanitary strategies to minimize the occurrence of native outbreaks of ISAv.
ISSN:0272-7714
1096-0015
DOI:10.1016/j.ecss.2015.02.013