Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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Notochord opacity in fry ayu, Plecoglossus altivelis

  • Huh, Min Do (Department of Aquatic Life Medicine, College Of Fisheries Science, Pukyong National University) ;
  • Lee, Hyo Eun (Department of Aquatic Life Medicine, College Of Fisheries Science, Pukyong National University) ;
  • Lee, Mu Kun (Korean Aquatic Organism Disease Inspector Association) ;
  • Kim, Bo Sung (Aquatic Life Disease Control Division, National Fishery Products Quality Management Service)
  • Received : 2021.04.05
  • Accepted : 2021.06.10
  • Published : 2021.06.30
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Abstract

An ayu (Plecoglossus altivelis) farm in Korea recently experienced an epidemic of vertebral column deformities where about 90% of fry displayed a vertebral column that was grossly opaque along either the cranial part of the column or its entire length. Abnormal fish were lordotic, scoliotic and/or kyphotic about midway down the spine. Examination of serial sections of whole fish showed only histological lesions in the vertebral column and suggested some disturbance in the early development of the vertebral centrum. Such abnormalities included a frayed spinal or notochord sheaths with irregular thickening and compression, mal-absorbed notochord cells, thickening of around cell layer and hypercellularity on both facets of the notochord sheath. No parasites, fungi, or bacteria were detected. While this lesion has only been reported once in the past, this is the first report of histopathological findings.

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References

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