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Development of proliferative kidney disease in rainbow trout, Oncorhynchus mykiss (Walbaum), following short-term exposure to Tetracapsula bryosalmonae infected bryozoans Longshaw, M.; Le Deuff, R.M.; Harris, A.F.; Feist, S.W. (2002). Development of proliferative kidney disease in rainbow trout, Oncorhynchus mykiss (Walbaum), following short-term exposure to Tetracapsula bryosalmonae infected bryozoans. J. Fish Dis. 25(8): 443-449. https://dx.doi.org/10.1046/j.1365-2761.2002.00353.x In: Journal of Fish Diseases. Blackwell Science: Oxford; London; Edinburgh; Boston; Melbourne. ISSN 0140-7775; e-ISSN 1365-2761

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Beschikbaar in	Auteurs
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Trefwoorden

Anatomical structures > Body organs > Animal organs > Excretory organs > Kidneys Diseases Oncorhynchus mykiss (Walbaum, 1792) [WoRMS] Marien/Kust; Brak water; Zoet water

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Auteurs		Top
Longshaw, M., correspondent Le Deuff, R.M. Harris, A.F. Feist, S.W.

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Abstract

The initial site of infection in the fish host for Tetracapsula bryosalmonae, causative agent of proliferative kidney disease (PKD) is poorly understood. Following the recent recognition that freshwater bryozoans harbour the infective stages to salmonid fish, experimental transmission studies were undertaken to investigate (1) the route of entry of the parasite into the fish host and (2) the minimum exposure time required to induce clinical signs of PKD. In-situ hybridization (ISH) studies were carried out on naïve rainbow trout exposed to the naturally infected bryozoan Fredericella sultana for up to 90 min. The sporoplasm of T. bryosalmonae was detected entering the fish via mucous cells in the skin epithelium within the first minute of exposure. In addition, T. bryosalmonae cells were infrequently detected in the skeletal musculature of exposed experimental fish up to 72 h post-exposure. The route of migration through the fish to the kidney and spleen was not determined. All fish exposed to infected, disrupted bryozoans for 10, 30 and 90 min and maintained for up to 8 weeks developed clinical PKD.

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