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Detection and Quantification of Two Parasitic Ciliates Boveria labialis and Boveria subcylindrica (Ciliophora: Scuticociliatia) by Fluorescence in situ Hybridization.
Journal of Eukaryotic Microbiology 2018 July
The thigmotrich scuticociliates Boveria labialis and Boveria subcylindrica are obligate parasites that may cause high mortality in cultured sea cucumbers and bivalves. Morphological methods can identify these organisms in active state, but are unable to discern them in resting stages. In aquaculture practice, these parasitic ciliates are hard to eradicate when massive infection occurs in sea cucumbers. Thus, early detection and precaution are crucial for the control of these pathogens. Under such circumstances, fluorescence in situ hybridization (FISH) will serve as a fast way to detect and monitor the occurrence of these parasites. We designed two SSU-rDNA targeted oligonucleotide probes labeled with fluorochromes, and optimized the FISH protocols for the detection of B. labialis and B. subcylindrica from the host sea cucumber Apostichopus japonicus and the bivalve Atrina pectinata, respectively. The assays resulted in a clear differentiation of the two similar species by strong fluorescence signals from the oligonucleotide probes. Moreover, we successfully used the FISH protocol to detect the cysts of B. labialis and variation in abundance of active parasites to evaluate the efficacy of chemical treatments. This is the first report and detection of the cysts of B. labialis from the host sea cucumber A. japonicus.
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