Proliferative kidney disease in brown trout – infection level, pathology and mortality under field conditions

Schmidt-Posthaus, Heike; Hirschi, Regula; Schneider, Ernst (2015). Proliferative kidney disease in brown trout – infection level, pathology and mortality under field conditions. Diseases of aquatic organisms, 114(2), pp. 139-146. Inter-Research 10.3354/dao02855

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Proliferative kidney disease (PKD) is an emerging disease threatening wild salmonid populations. In temperature-controlled aquaria, PKD can cause mortality rates of up to 85% in rainbow trout. So far, no data about PKD-related mortality in wild brown trout Salmo trutta fario are available. The aim of this study was to investigate mortality rates and pathology in brown trout kept in a cage within a natural river habitat known to harbor Tetracapsuloides bryosalmonae. Young-of-the-year (YOY) brown trout, free of T. bryosalmonae, were exposed in the River Wutach, in the northeast of Switzerland, during 3 summer months. Samples of wild brown trout caught by electrofishing near the cage location were examined in parallel. The incidence of PKD in cage-exposed animals (69%) was not significantly different to the disease prevalence of wild fish (82 and 80% in the upstream and downstream locations, respectively). The mortality in cageexposed animals, however, was as low as 15%. At the termination of the exposure experiment, surviving fish showed histological lesions typical for PKD regression, suggesting that many YOY brown trout survive the initial infection. Our results at the River Wutach suggest that PKD in brown trout does not always result in high mortality under natural conditions.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Center for Fish and Wildlife Health (FIWI)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)

UniBE Contributor:

Schmidt-Posthaus, Heike and Hirschi, Regula

Subjects:

600 Technology > 630 Agriculture
500 Science > 590 Animals (Zoology)
600 Technology > 610 Medicine & health

ISSN:

0177-5103

Publisher:

Inter-Research

Language:

English

Submitter:

Heike Schmidt Posthaus

Date Deposited:

11 Feb 2016 09:13

Last Modified:

26 Jun 2016 02:10

Publisher DOI:

10.3354/dao02855

PubMed ID:

25993888

Uncontrolled Keywords:

PKD, Salmo trutta, Tetracapsuloides bryosalmonae, Mortality, Renal pathology, Water temperature

BORIS DOI:

10.7892/boris.75340

URI:

https://boris.unibe.ch/id/eprint/75340

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