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First Isolation of Pseudocohnilembus persalinus (Ciliophora: Scuticociliatida) From Freshwater-Reared Rainbow Trout, Oncorhynchus mykiss

Simon R. M. Jones, Gina Prosperi-Porta and Scott E. LaPatra
The Journal of Parasitology
Vol. 96, No. 5 (OCTOBER 2010), pp. 1014-1016
Stable URL: http://www.jstor.org/stable/40962144
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
First Isolation of Pseudocohnilembus persalinus (Ciliophora: Scuticociliatida) From Freshwater-Reared Rainbow Trout, Oncorhynchus mykiss
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Abstract

Ciliated protists were isolated from the ovarian fluid of apparently healthy adult rainbow trout (Oncorhynchus mykiss) maintained in freshwater. The organism was identified as Pseudocohnilembus persalinus based on morphometric and morphological analysis of silverstained specimens obtained from culture and on analysis of ribosomal RNA gene sequences. The cytochrome c oxidase subunit 1 gene sequence of this organism also was characterized. This ciliate has been reported previously as free living only in saline environments and as an endosymbiont in a marine teleost, the olive flounder (Paralichthys olivaceus). A cyst-like stage may have facilitated the novel occurrence of this organism as an endosymbiont in rainbow trout.

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