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Arndt, D.* ; Fux, R.* ; Blutke, A. ; Schwaiger, J.* ; El-Matbouli, M.* ; Sutter, G.* ; Langenmayer, M.C.*

Proliferative kidney disease and proliferative darkening syndrome are linked with brown trout (Salmo trutta fario) mortalities in the pre-alpine Isar River.

Pathogens 8:177 (2019)

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For many years, brown trout (Salmo trutta fario) mortalities within the pre-alpine Isar River in Germany were reported by the Bavarian Fisheries Association (Landesfischereiverband Bayern e.V.) and local recreational anglers during August and September. Moribund fish seemed to be affected by proliferative darkening syndrome (PDS). In addition, proliferative kidney disease (PKD) caused by Tetracapsuloides bryosalmonae was discussed. To investigate this phenomenon, the present field study monitored brown trout mortalities by daily river inspection in 2017 and 2018. Moribund brown trout (n = 31) were collected and examined using histology, immunohistochemistry, qPCR, and quantitative stereology. Our investigations identified 29 (93.5%) brown trout affected by PKD. Four brown trout (12.9%) displayed combined hepatic and splenic lesions fitting the pathology of PDS. The piscine orthoreovirus 3, suspected as causative agent of PDS, was not detectable in any of the samples. Quantitative stereological analysis of the kidneys revealed a significant increase of the renal tissue volumes with interstitial inflammation and hematopoietic hyperplasia in PKD-affected fish as compared to healthy brown trout. The identified T. bryosalmonae strain was classified as part of the North American clade by phylogenetical analysis. This study highlights PKD and PDS as contributing factors to recurrent autumnal brown trout mortalities.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Immunohistochemistry ; Pds ; Piscine Orthoreovirus 3 ; Pkd ; Quantitative Stereology ; Tetracapsuloides Bryosalmonae; Tetracapsuloides-bryosalmonae Myxozoa; Rainbow-trout; Oncorhynchus-mykiss; Water Temperature; Fish; Infection; Pkd; Pathology; Malacosporea; Agent

ISSN (print) / ISBN 2076-0817

e-ISSN 2076-0817

Journal Pathogens

Quellenangaben Volume: 8, Issue: 4, Article Number: 177

Publisher MDPI

Publishing Place Basel

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Analytical Pathology (AAP)