Complex interaction between proliferative kidney disease, water temperature and concurrent nematode infection in brown trout

Schmidt-Posthaus, Heike; Steiner, Pascale; Müller, Barbara; Casanova, Ayako (2013). Complex interaction between proliferative kidney disease, water temperature and concurrent nematode infection in brown trout. Diseases of aquatic organisms, 104(1), pp. 23-34. Oldendorf (Luhe) (D): Inter-Research 10.3354/dao02580

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Proliferative kidney disease (PKD) is a temperature-dependent disease caused by the myxozoan Tetracapsuloides bryosalmonae. It is an emerging threat to wild brown trout Salmo trutta fario populations in Switzerland. Here we examined (1) how PKD prevalence and pathology in young-of-the-year (YOY) brown trout relate to water temperature, (2) whether wild brown trout can completely recover from T. bryosalmonae-induced renal lesions and eliminate T. bryo - salmonae over the winter months, and (3) whether this rate and/or extent of the recovery is influenced by concurrent infection. A longitudinal field study on a wild brown trout cohort was conducted over 16 mo. YOY and age 1+ fish were sampled from 7 different field sites with various temperature regimes, and monitored for infection with T. bryosalmonae and the nematode Raphidascaris acus. T. bryosamonae was detectable in brown trout YOY from all sampling sites, with similar renal pathology, independent of water temperature. During winter months, recovery was mainly influenced by the presence or absence of concurrent infection with R. acus larvae. While brown trout without R. acus regenerated completely, concurrently infected brown trout showed incomplete recovery, with chronic renal lesions and incomplete translocation of T. bryosalmonae from the renal interstitium into the tubular lumen. Water temperature seemed to influence complete excretion of T. bryosalmonae, with spores remaining in trout from summer-warm rivers, but absent in trout from summer-cool rivers. In the following summer months, we found PKD infections in 1+ brown trout from all investigated river sites. The pathological lesions indicated a reinfection rather than a proliferation of remaining T. bryosalmonae. However, disease prevalence in 1+ trout was lower than in YOY.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Center for Fish and Wildlife Health (FIWI)

UniBE Contributor:

Schmidt-Posthaus, Heike; Müller, Barbara and Casanova, Ayako

Subjects:

600 Technology > 630 Agriculture
500 Science

ISSN:

0177-5103

Publisher:

Inter-Research

Language:

English

Submitter:

Heike Schmidt Posthaus

Date Deposited:

22 Jan 2014 14:01

Last Modified:

29 Apr 2018 02:30

Publisher DOI:

10.3354/dao02580

PubMed ID:

23670077

Uncontrolled Keywords:

Tetracapsuloides bryosalmonae, PKD, Raphidascaris acus, Water temperature, Salmo trutta fario, Pathology, Recovery

BORIS DOI:

10.7892/boris.39222

URI:

https://boris.unibe.ch/id/eprint/39222

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