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http://dx.doi.org/10.3347/kjp.2021.59.1.89

Occurrence and Molecular Identification of Microcotyle sebastis Isolated from Fish Farms of the Korean Rockfish, Sebastes schlegelii  

Song, Jun-Young (Pathology Research Division, National Institute of Fisheries Science)
Kim, Keun-Yong (Department of Genetic Analysis, AquaGenTech Co., Ltd)
Choi, Seo-Woo (Southeast Sea Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Parasites, Hosts and Diseases / v.59, no.1, 2021 , pp. 89-95 More about this Journal
Abstract
Microcotyle sebastis is a gill monogenean ectoparasite that causes serious problems in the mariculture of the Korean rockfish, Sebastes schlegelii. In this study, we isolated the parasite from fish farms along the coasts of Tongyeong, South Korea in 2016, and characterized its infection, morphology and molecular phylogeny. The prevalence of M. sebastis infection during the study period ranged from 46.7% to 96.7%, and the mean intensity was 2.3 to 31.4 ind./fish, indicating that the fish was constantly exposed to parasitic infections throughout the year. Morphological observations under light and scanning electron microscopes of the M. sebastis isolates in this study showed the typical characteristics of the anterior prohaptor and posterior opisthaptor of monogenean parasites. In phylogenetic trees reconstructed using the nuclear 28S ribosomal RNA gene and the mitochondrial cytochrome c oxidase I gene (cox1), they consistently clustered together with their congeneric species, and showed the closest phylogenetic relationships to M. caudata and M. kasago in the cox1 tree.
Keywords
Microcotyle sebastis; fish farm; Korean rockfish; monogenean parasite; infection; molecular phylogeny; morphology;
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