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External Symptoms of Tiger Puffer, Takifugu rubripes Infected with Scuticociliates and Distribution of the Scuticociliates in the Skin, Gill and Blood Vessel  

Kang, Bub-Se (Jeju Aquacuture Place, Sajo CS Co., Ltd.)
Go, Hwan-Bong (Jeju Aquacuture Place, Sajo CS Co., Ltd.)
Kim, Sung-Jun (Marine and Environmental Research Institute, Cheju National University)
Na, Oh-Soo (Marine and Environmental Research Institute, Cheju National University)
Lee, Chi-Hoon (Marine and Environmental Research Institute, Cheju National University)
Kim, Sam-Yeon (Marine and Environmental Research Institute, Cheju National University)
Lee, Je-Hee (Faculty of Applied Marine Science, Cheju National University)
Lee, Young-Don (Marine and Environmental Research Institute, Cheju National University)
Publication Information
Journal of fish pathology / v.18, no.1, 2005 , pp. 29-37 More about this Journal
Abstract
This study investigated external symptoms, behavior characteristics and the distribution pattern of the scuticociliates in the skin, gill and blood vessel of the tiger puffer, Takifugu rubripes, infected with scuticociliates among tiger puffer cultured. The fish infected with scuticociliates did not show any external symptoms, such as change in body color or swimming behavior, in the early infection stage. However, they showed congestion, erosion, and ulcer on the skin and fin at advanced stages. They showed a turning movement, mainly stayed on the bottom, and swam with their mouths open at the surface of water. Some fish showed a sudden swimming movement of zigzag type. The scuticociliates were ovoid in shape and $20\times40{\mu}m$ in size. The scuticociliates had a contractile vesicle and a caudal cilium that ranged 10-12 ${\mu}m$, and reproduced by binary fission. Therefore the scuticociliates were identified as ciliated, belonging to class Hymenostomatia, order Scuticociliatida in morphogenetic character. The gills infiltrated with scuticociliates showed clubbed gill filament due to hypertrophy of gill lamella. Within the blood vessels, scuticociliates were observed one to ten individuals, depending on diameter of the blood vessels. Some of the scuticociliates were observed to have ingested erythrocytes.
Keywords
Scuticociliates; Tiger Puffer; Takifugu rubripes; External symptoms;
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