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A mixed infection of epitheliocystis, Microcotyle sebstes and unknown aetiology in cultured rockfish (Sebastes schlegeli) from farms in Huksan Island  

Park, Sung-Woo (Department of Aquatic life Medicine, Kunsan National University)
Yu, Jin-Ha (Department of Aquatic life Medicine, Kunsan National University)
Lee, Kyung-Hee (Mokpo Fisheries Office, National Fisheries R & D Institute)
Publication Information
Journal of fish pathology / v.22, no.1, 2009 , pp. 9-14 More about this Journal
Abstract
Fifteen diseased rockfish (Sebastes schlegeli) were collected from 4 net-cage farms in Huksan island. Some round transparent nodules were observed on gill filaments in fish. Bacteriological and histopathological examinations on the diseased fish were performed. Any pathogenic bacteria could not be isolated from the internal tissues and histopathological alterations were not found in any of the tissues except the gills. Rock fish were infected with epitheliocystis, Microcotyle sebastes and unknown aetiology on the gills. Cysts of epitheliocystis measuring 44.1-68.9 $\mu{m}$ in diameter were mainly found in the distal portion of the gill filaments and sometimes in the middle portion. But host responses were moderate in spite of formation of the epithelial cysts. Some Microcotyle sebastes captured the secondary filaments with clamps on the opisthohaptor. Attachment of the parasites provoked epithelial proliferation and resulted in gill lamellar fusion.Cysts of unknown origins measuring 26-425 $\mu{m}$ in diameter were found in the cartilage of gill filaments. These cysts contained eosinophilic materials and proliferation of cartilage cells was confirmed around the cysts. But there was no significant pathological changes associated with the presence of the cysts except enlargement of the gill filament with the cysts.
Keywords
Rockfish; Epitheliocystis; Microcotyle; Mixed infection;
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