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Limpanont Yanin,강현실,조영관,신종섭,Kajino Nobuhisa,김정화,홍현기,최광식 한국해양과학기술원 2023 Ocean and Polar Research Vol.44 No.4
The paramyxean parasite Marteilioides chungmuensis infects the cytoplasm of the eggs of Pacific oysters Crassostrea gigas , resulting in spawning failure of the infected females. Such infected eggs appear as bump-like nodules on the body in late fall when most of the uninfected females complete spawning. In this study, we estimated the quantity of the infected eggs using an enzyme-linked immunosorbent assay (ELISA), which is destroyed by M. chungmuensis parasitism. In December, the infected oysters collected from Tongyoung on the south coast exhibited numerous yellowish bump-like nodules as signs of infection. In histology, the infected oysters exhibited mature eggs in the follicle, which were heavily infiltrated by hemocytes. ELISA indicated that the infected egg mass accounted for 7.52±5.50 percent of the body weight, suggesting the ovarian parasite causes substantial reproductive loss. Histology also indicated that the infected oysters are in a poor nutritional condition, as the digestive gland atrophy (DGA) level is comparatively higher than the uninfected oyster. The total carbohydrate contents in the infected oysters (108.68±44.41 mg/g dry wt) were significantly lower than in uninfected oysters (269.76±50.97 mg/g dry wt), suggesting that M. chungmuensis parasitism also affected the energy storage capacity of the host during the resting stage.
산란기 지중해담치 Mytilus galloprovincialis의 조직병리학적 변화 관찰
정희도,이지연,Yanin Limpanont,박경일,강현실,김철원,김형섭,최광식 한국해양과학기술원 2014 Ocean and Polar Research Vol.36 No.2
Sessile marine bivalves including mussels, oysters and clams are often used as a sentinel species in coastal environmental monitoring since changes in the environmental quality are often well preserved in their tissues and shells. In this study, we investigated overall health condition of the Mediterranean Mussel, Mytilus galloprovincialis on the south coast using histology. Reproductive condition as gonad index (GI), condition index (CI) as a ratio of the tissue weight to the shell weight, digestive gland atrophy (DGA), types of parasites, and pathologic conditions including erosion, necrosis, hemocyte infiltration, and neoplasia were examined from each histological preparation. GI decreased from March to July then increased from July to September and spawning mussel could be observed as early as in April and the activity continued until September. CI also followed the monthly changes in GI, indicating that decrease in CI was associated with the weight loss due to spawning. DGA increased from March to June, decreased in July and increased from July to September. High DGA values observed in June and September were coincided with spawning and high water temperature. Histology also showed high prevalence of erosion in the digestive gland in June (36.0%) and September (56.4%), suggesting that high water temperature and spawning acted as environmental stressors. No parasitic organism was identified during the survey, although some symbiotic copepods were observed. Histology was found to be useful and affordable technique in monitoring the overall health of mussel, providing useful pathologic information of the cells and tissues.
Kang, Hyun-Sil,Itoh, Naoki,Limpanont, Yanin,Lee, Hye-Mi,Whang, Ilson,Choi, Kwang-Sik Elsevier 2019 Journal of invertebrate pathology Vol.163 No.-
<P><B>Abstract</B></P> <P>Paramyxean parasites in the genus <I>Marteilia</I> deteriorate digestive tissues of the host organisms, resulting in mortality of oysters, cockles, and mussels. Most reports of infection by <I>Marteilia</I> spp. are from Europe, while a new species of <I>Marteilia</I> was identified recently in Japan. Here, we report a previously unidentified species in the genus <I>Marteilia</I> from digestive diverticula of Manila clam <I>Ruditapes philippinarum</I> from the south coast of Korea. Prevalence of the parasite was low, 0.5–3.3% in the study sites. We characterized this species using light and transmission electron microscopy (TEM), and analyzed the 18S rDNA sequence. Light microscopy revealed the sporulation process from uninucleated stage to spore in the epithelial tissues of the digestive gland. TEM revealed that the parasites produced four secondary cells containing four tri-cellular spores. An electron-dense haplosporosome-like structure and striated inclusions were evident in the spore and the primary cells, respectively, while refringent granules were rarely observed in the secondary cells. Phylogenetic analyses of the 18S rDNA sequence placed this isolate in the genus <I>Marteilia</I>, although it is not identical to other known species in the genus. Based on morphological and molecular characters, we describe this species as <I>Marteilia tapetis</I> sp. nov., the second <I>Marteilia</I> species reported parasitizing Manila clams in Asian waters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel paramyxean parasite, <I>Marteilia tapetis</I> sp. nov<I>.</I> infecting Manila clams is described. </LI> <LI> Uni-nucleated stages to spores were present in the epithelial tissues of digestive gland. </LI> <LI> This is the second <I>Marteilia</I> species reported parasitizing Manila clams in Asian waters. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>