Evaluation of rainbow trout as a model for use in ...

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Title Evaluation of rainbow trout as a model for use in studies on pathogenesis of the branchial microsporidian Loma salmonae
Author(s) David J. Speare, G. J. Arsenault, M. A. Buote
Journal Contemporary Topics in Laboratory Animal Science
Date 1998
Volume 37
Issue 2
Start page 55
End page 58
Abstract Using gill tissue from chinook salmon (Oncorhynchus tshawytscha) that contained mature xenomas laden with Loma salmonae spores, the infection was successfully transmitted to rainbow trout (O. mykiss). The infection developed in an identical manner and over a similar time course in trout as in chinook salmon. In contrast, the infection could not be transmitted to other candidate salmonid species, including Atlantic salmon (Salmo salar), brook trout (Salvelinus fontinalis) or arctic charr (S. alpinus). Gill tissue from experimentally infected rainbow trout was then used to successfully transmit the parasite to other trout. Horizontal transmission was documented from infected to naive tankmates. Analysis of the results indicated that L. salmonae can have a complete life cycle in trout and produce viable spores. Although abundant xenomas developed in the gills of infected trout, the fish did not have clinical signs and there were no fatalities. It is concluded that use of rainbow trout offers several key advantages for the study of pathobiological characteristics of L. salmonae..

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