Piscine orthoreovirus (PRV) in red and melanised foci in white muscle of Atlantic salmon (Salmo salar)

Veterinary Research
Håvard BjørgenErling Olaf Koppang

Abstract

Melanised focal changes (black spots) are common findings in the white skeletal muscle of seawater-farmed Atlantic salmon (Salmo salar). Fillets with melanised focal changes are considered as lower quality and cause large economic losses. It has been suggested that red focal changes (red spots) precede the melanised focal changes. In the present work, we examined different populations of captive and wild salmon for the occurrence of both types of changes, which were investigated for the presence of different viruses by immunohistochemistry and RT-qPCR. The occurrence of red or melanised foci varied significantly between the populations, from none in wild fish control group, low prevalence of small foci in fish kept in in-house tanks, to high prevalence of large foci in farm-raised salmon. Large amounts of Piscine orthoreovirus (PRV) antigen were detected in all foci. No other viruses were detected. Red focal changes contained significantly higher levels of PRV RNA than apparently non-affected areas in white muscle of the same individuals. Some changes displayed a transient form between a red and melanised pathotype, indicating a progression from an acute to a chronic manifestation. We conclude that PRV is associated with the fo...Continue Reading

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Citations

May 24, 2016·Fish & Shellfish Immunology·Aleksei KrasnovTurid Mørkøre
Sep 17, 2020·Journal of Fish Diseases·Mark P PolinskiKyle A Garver
Apr 4, 2019·Virology Journal·Molly J T KibengeFrederick S B Kibenge

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Methods Mentioned

BETA
confocal microscopy

Software Mentioned

GraphPad Prism

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