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. 2003 Apr;9(4):455-60.
doi: 10.3201/eid0904.020311.

Infectious pancreatic necrosis virus in Scottish Atlantic salmon farms, 1996-2001

Alexander G Murray  1 , Corina D Busby, David W Bruno
Affiliations

Infectious pancreatic necrosis virus in Scottish Atlantic salmon farms, 1996-2001

Alexander G Murray et al. Emerg Infect Dis. 2003 Apr.

Abstract

The rapid growth of aquaculture has provided opportunities for the emergence of diseases. Programs designed to monitor these pathogens are useful for analysis of regional variation and trends, provided methods are standardized. Data from an official monitoring program were used to analyze the emergence of infectious pancreatic necrosis virus in Scottish salmon farms from 1996 to 2001. An annual increase in the prevalence of this virus was found in saltwater (10%) and freshwater sites (2% to 3%), with a much faster increase (6.5%) in Shetland's freshwater sites. No significant increase in the virus was detected in the marine farms of southern mainland Scotland. However, the virus had become very prevalent at marine sites and was almost ubiquitous in Shetland by 2001. The prevalence of this virus at marine sites may be underestimated. Because several diseases have emerged or are emerging in fish farming, aquaculture surveillance programs represent a rich potential source of data on emerging diseases.

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Figures

Figure 1
Figure 1
Salmon production regions in Scotland, including the city of Aberdeen, the site of the FRS Marine Laboratory, where fish health inspectors and virologists are based.
Figure 2
Figure 2
Prevalence of infectious pancreatic necrosis virus in Scottish marine salmon production sites by region and year. The regions are northern mainland Scotland, southern mainland Scotland, Shetland, Orkney, and the Outer Hebrides. Bars show 95% confidence intervals.
Figure 3
Figure 3
Prevalence of infectious pancreatic necrosis virus in Scottish freshwater salmon production sites by region and year. The regions are northern mainland Scotland, southern mainland Scotland, Shetland, Orkney, and the Outer Hebrides. Bars show 95% confidence intervals.
Figure 4
Figure 4
Mean of regional annual mean prevalence of infectious pancreatic necrosis virus in marine salmon farms (thin dashed line) and standard deviation of regional annual means (thick solid line), by year. Individual marine regional annual means are shown by circles (where two circles overlay, a large square is added). Standard deviation has fallen at an increasing rate, in spite of increasing mean regional prevalence.
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