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

Niccolò Vendramin*, Argelia Cuenca, Juliane Sørensen, Anna Luiza Farias Alencar, Debes H Christiansen, Jan A Jacobsen, Charlotte Axen, François Lieffrig, Neil M Ruane, Patrick Martin, Timothy Sheehan, Tine M Iburg, Espen Rimstad, Niels Jørgen Olesen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalJournal of Fish Diseases
Volume42
Issue number8
Pages (from-to)1107-1118
Number of pages12
ISSN0140-7775
DOIs
Publication statusPublished - 2019

Keywords

  • PRV-1
  • Atlantic salmon
  • Epidemiology
  • Phylogeny
  • Sequencing

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