High transmittance of X-rays in the utricular otolith of upside-down swimming catfish, Synodontis nigriventris

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The upside-down swimming catfish (<i>Synodontis nigriventris</i>) has unique behavior, i.e., it frequently shows a stable upside-down posture during swimming and resting. To examine whether the unique postural control in S. nigriventris results from the characteristics of the vestibular organ, we observed the morphological aspects of the otolith and the orientation of sensory hair cells in the utricle. Soft X-ray densitometry analysis showed that the transmittance of soft X-rays in the otolith of S. nigriventris was higher than that in a closely related species (<i>Synodontis multipunctatus</i>) belonging to <i>Synodontis</i> family, goldfish (<i>Carassius auratus</i>) or miniature catfish (<i>Corydoras paleatus</i>) which shows upside-up swimming. The higher transmittance of soft X-rays suggests that the density of the otolith in <i>S. nigriventris</i> is lower than that in <i>S. multipunctatus</i>, <i>C. auratus</i> or <i>C. paleatus</i>. It is possible that the low density of the otolith may have a relation to the control of the unique upside-down posture of S. nigriventris. The hair cells in <i>S. nigriventris</i> were present at the ventral to ventro-lateral site of the utricular epithelium, forming a single hair cell layer as in the other 3 species of fish. The orientation of the sensory hair cells does not appear to cause the unique postural control.

収録刊行物

  • 宇宙生物科学 = Biological sciences in space

    宇宙生物科学 = Biological sciences in space 16(1), 18-21, 2002-03-01

    Japanese Society for Biological Sciences in Space

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各種コード

  • NII論文ID(NAID)
    10008690392
  • NII書誌ID(NCID)
    AN10164806
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09149201
  • NDL 記事登録ID
    6193806
  • NDL 雑誌分類
    ZR1(科学技術--生物学) // ZM33(科学技術--宇宙科学)
  • NDL 請求記号
    Z18-2504
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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