DAO 127:151-156 (2018)  -  DOI: https://doi.org/10.3354/dao03200

NOTE
Tetracapsuloides bryosalmonae persists in brown trout Salmo trutta for five years post exposure

Hatem Soliman*,**, Gokhlesh Kumar**, Mansour El-Matbouli

Clinical Division of Fish Medicine, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria
*Corresponding author:
**These authors contributed equally to this work

ABSTRACT: Tetracapsuloides bryosalmonae is a malacosporean parasite and the causative agent of proliferative kidney disease (PKD) that seriously impacts farmed and wild salmonids. The parasite’s life cycle includes an invertebrate host, the bryozoan Fredericella sultana, and a vertebrate host, salmonid fish. The persistence of T. bryosalmonae in brown trout Salmo trutta for up to 2 yr following exposure is well documented. Results from the present study confirmed that one brown trout that had recovered from PKD did not completely clear the parasite from its tissues and that T. bryosalmonae could persist in brown trout for up to 5 yr post exposure. Furthermore, recovered infected brown trout can release viable T. bryosalmonae spores that are able to infect specific pathogen-free F. sultana colonies. T. bryosalmonae DNA was detected by PCR in every organ, and parasite stages were observed in the kidney, spleen and liver following immunohistochemistry. This finding indicates that T. bryosalmonae-infected brown trout can act as asymptomatic carriers and release the parasite for several years after the initial infection, acting as a reservoir of infection, and contributing to the dissemination of the parasite to new areas.


KEY WORDS: Malacosporean · Proliferative kidney disease · Fredericella sultana · Persistence of infection


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Cite this article as: Soliman H, Kumar G, El-Matbouli M (2018) Tetracapsuloides bryosalmonae persists in brown trout Salmo trutta for five years post exposure. Dis Aquat Org 127:151-156. https://doi.org/10.3354/dao03200

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