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Diseases of Aquatic Organisms

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DAO 47:49-55 (2001)  -  doi:10.3354/dao047049

Morphology and biology of parasite responsible for scuticociliatosis of cultured olive flounder Paralichthys olivaceus

Bo-Young Jee*, Yi-Cheung Kim, Mi Seon Park

Pathology Division, National Fisheries Research and Development Institute, 408-1, Kijang, Pusan 619-900, Korea

ABSTRACT: Based on the arrangement and shape of the buccal structure, scuticociliates isolated from cultured olive flounder Paralichthys olivaceus belonged to the family Uronematidae and showed many characteristics of Uronema marinum. There was variation in the morphometry of clinical isolates taken from different organs of infected flounder. However, the isolates did not show any significant difference in morphometry under cultured conditions. The ciliates were easily maintained in in vitro medium to which antibiotic agents had been added and which had been enriched with the raw brain tissue of a healthy olive flounder. The ciliates propagated in a wide range of both temperature (6 to 30°C) and salinity (10 to 35 ppt).

KEY WORDS: Olive flounder · Paralichthys olivaceus · Scuticociliatosis · Uronema marinum

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