飼育クロマグロの骨格異常  [in Japanese] Bone Abnormarity of Hatchery-reared Bluefin Tuna Thunnus orientalis  [in Japanese]

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Abstract

1996年7・8月に日本栽培漁業協会八重山事業場で飼育された, ふ化後1~26日, 全長3.5~31.1mmのクロマグロ278尾について骨格異常の症状の分類と記載を行った。骨格異常はふ化後2週間以降の供試魚のみで観察された。ふ化後2週間以降の供試魚221尾における骨格異常発現率は61.5%であった。全異常魚に占める各症状の割合は, 背鰭担鰭骨の異常83.8%, 臀鰭担鰭骨の異常12.5%, 椎体の異常11.8%, 神経棘の異常26.5%, 血管棘の異常20.6%, 尾骨の異常17.6%, その他の異常7.4%であった。背鰭担鰭骨の異常は棘を担う箇所で多く発現し, 臀鰭担鰭骨の異常は第1~第5軟条および第1~第5小離鰭を担う箇所で多く発現していた。神経棘, 血管棘および椎体の異常は第31~第37椎体で多く発現していた。また, 背鰭担鰭骨の異常はその他の症状と併発することが多かった。

We examined abnormal bone formations in hatchery reared bluefin tuna. For the study, 278 larvae of bluefin tuna were used from 1-26 days after hatching. Their total lengths were 3.5 mm to 31.1 mm. They were reared at Yaeyama Station of the Japan Sea-Farming Association in July and August 1996.<BR>Bone abnormalities were not observed in hatchlings younger than 14 days. The occurrence rate of bone abnormalities in 221 hatchlings older than 14 days was 61.5%. Abnormalities occurred at the following rates: 83.8%, dorsal pterygiophore; 12.5%, anal pterygiophore; 11.8%, centrum; 26.5%, neural spine; 20.6%, haemal spine; 17.6%, caudal skeleton and others; 7.4%. Abnormalities in the dorsal pterygiophore occurred frequently in the spine, and abnormalities in the anal pterygiophore occurred frequently in the first to the fifth of the soft rays and finlets. Abnormalities of the neural spine, haemal spine, and centrum occurred frequently in the 31st to the 37th centrum. Dorsal pterygiophore abnormalities often occurred with other symptoms.

Journal

  • Aquaculture Science

    Aquaculture Science 50(1), 71-78, 2002-03-25

    Japanese Society for Aquaculture Science

References:  10

Cited by:  2

Codes

  • NII Article ID (NAID)
    10008020263
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03714217
  • NDL Article ID
    6115936
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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