Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Short Communications
A New Disease in Cultured Yellowtail Seriola quinqueradiata Characterized by Encephalomyelitis
Takayuki KatagiriAika HosokawaMasashi MaitaMakiko HiraiShusaku TakagiMakoto Endo
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2007 Volume 42 Issue 4 Pages 223-224


In many yellowtail Seriola quinqueradiata farms in the vicinity of Uwajima city, Ehime Prefecture, Japan, a new disease has caused heavy mortalities of yearlings, mainly in summer and autumn. Symptoms included anorexia, lethargy with occasional bursts of swimming and redness in the central nervous system. In a histological survey, the most noticeable sign was severe encephalomyelitis. It is suspected that densely packed parasite-like cells (about 4 μm in diameter) in the spinal cords are the causative agent of this disease.

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© 2007 The Japanese Society of Fish Pathology
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