Journal of Aquaculture Research & Development

Shusaku Takagi

Publications

• Research Article
  Recently Emerged Myxosporean Encephalomyelitis of Cultured Yellowtail Seriola quinqueradiata in Japan
  Author(s): Hiroshi Yokoyama, Fei Meng, Makiko Hirai, Shusaku Takagi, Takayuki Katagiri, Makoto Endo and Kazuo Ogawa Hiroshi Yokoyama, Fei Meng, Makiko Hirai, Shusaku Takagi, Takayuki Katagiri, Makoto Endo and Kazuo Ogawa
  
  Encephalomyelitis associated with developmental stages of a myxosporean parasite has recently occurred in cultured yellowtail Seriola quinqueradiata from western Japan. Although mature spore stages of the parasite were not found in the spinal cord, the myxosporean was molecularly identified as Myxobolus spirosulcatus by the 18S rDNA analysis and in situ hybridization and has been previously reported as a non-pathogenic parasite infecting the bile duct of yellowtail. However, the causal relationship between the encephalomyelitis and M. spirosulcatus is still controversial. Typical signs of the disease were reduced feeding, erratic and abnormal swimming, skin ulceration from the jaw to the abdomen, and redness of the brain. Histopathologically, this disease was characterized by 1) gliosis and multi-focal glial nodules, 2) nerve cell necrosis with neurop.. View More»
  DOI: 10.4172/2155-9546.S2-004

  Abstract PDF