DAO 125:73-78 (2017)  -  DOI: https://doi.org/10.3354/dao03126

NOTE
First record of proliferative kidney disease agent Tetracapsuloides bryosalmonae in wild brown trout and European grayling in Finland

Anti Vasemägi1,2,*, Ilkka Nousiainen1, Ari Saura3, Juha-Pekka Vähä4, Jorma Valjus4, Ari Huusko

1Section of Genetics and Physiology, Department of Biology, University of Turku, 20014 Turku, Finland
2Department of Aquaculture, Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, 51014 Tartu, Estonia
3Natural Resources Institute Finland, 00791 Helsinki, Finland
4Association for Water and Environment of Western Uusimaa, 08101 Lohja, Finland
*Corresponding author:

ABSTRACT: The myxozoan endoparasite Tetracapsuloides bryosalmonae causes temperature-driven proliferative kidney disease (PKD) in salmonid fishes. Despite the economic and ecological importance of PKD, information about the distribution of the parasite is still scarce. Here, we report for the first time the occurrence of T. bryosalmonae in wild brown trout Salmo trutta and European grayling Thymallus thymallus populations in Finland. We detected T. bryosalmonae at high prevalence in both brown trout and European grayling from the transboundary Finnish-Russian River Koutajoki system (Rivers Oulankajoki, Kuusinkijoki, Kitkajoki, Maaninkajoki, and Juumajoki) in north-eastern Finland. In southern Finland, T. bryosalmonae was detected in River Siuntionjoki young-of-the-year brown trout collected both in 2015 and 2016 (100% prevalence), while the parasite was not observed in fish from 3 other rivers (Ingarskila, Mustajoki, and Vantaanjoki) flowing to the Gulf of Finland. Our results, together with those from recent studies of Atlantic salmon, indicate that T. bryosalmonae is distributed over much higher latitudes in northern Europe than previously appreciated. We expect that increasing water temperatures will likely cause new PKD outbreaks in these more northerly regions in the future.


KEY WORDS: Host · Pathogen · Bryozoa · Freshwater environments · DNA · PCR · Salmo trutta · Thymallus thymallus


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Cite this article as: Vasemägi A, Nousiainen I, Saura A, Vähä JP, Valjus J, Huusko A (2017) First record of proliferative kidney disease agent Tetracapsuloides bryosalmonae in wild brown trout and European grayling in Finland. Dis Aquat Org 125:73-78. https://doi.org/10.3354/dao03126

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