Presence and genetic variability of Piscine orthoreovirus genotype 1 (PRV-1) in wild salmonids in Northern Europe and North Atlantic Ocean

Piscine orthoreovirus genotype 1 (PRV-1) is widespread in farmed Atlantic salmon (Salmo salar L.) populations in northern Europe, Canada and Chile. PRV-1 occurs in wild fish in Norway and Canada; however, little information of its geographical distribution in wild populations is currently available,...

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Bibliographic Details
Published in:Journal of Fish Diseases
Main Authors: Vendramin, Niccolò, Cuenca, Argelia, Sørensen, Juliane, Alencar, Anna Luiza Farias, Christiansen, Debes H, Jacobsen, Jan A, Axen, Charlotte, Lieffrig, François, Ruane, Neil M, Martin, Patrick, Sheehan, Timothy, Iburg, Tine M, Rimstad, Espen, Olesen, Niels Jørgen
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
PRV-1
Atlantic salmon
Epidemiology
Phylogeny
Sequencing
Canada
Faroe Islands
Greenland
Norway
North Atlantic
Salmo salar
Online Access:https://orbit.dtu.dk/en/publications/11fb2aa7-3aac-4ad2-a7ee-3d7d43f9335f
https://doi.org/10.1111/jfd.13025
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Summary:Piscine orthoreovirus genotype 1 (PRV-1) is widespread in farmed Atlantic salmon (Salmo salar L.) populations in northern Europe, Canada and Chile. PRV-1 occurs in wild fish in Norway and Canada; however, little information of its geographical distribution in wild populations is currently available, and the effect of PRV-1 infection in wild populations is currently unknown. In this study, we present the findings of a survey conducted on 1,130 wild salmonids sampled in Denmark, Sweden, Ireland, Faroe Islands, France, Belgium and Greenland between 2008 and 2017. PRV-1 is reported for the first time in wild salmonids in Denmark, Sweden, Faroe Island and Ireland. The annual PRV-1 prevalence ranged from 0% in France, Belgium and Greenland to 43% in Faroe Islands. In total, 66 samples tested positive for PRV-1, including Atlantic salmon broodfish returning to spawn and Atlantic salmon collected at the feeding ground north of Faroe Islands. The phylogenetic analysis of S1 sequences of the PRV-1 isolates obtained in this survey did not show systematic geographical distribution. This study sheds light on the spread and genetic diversity of the virus identified in populations of free-living fish and provides rationale for screening wild broodfish used in restocking programmes.

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