Acid Tolerance of Japanese Dace (a Cyprinid Teleost) in Lake Osorezan, a Remarkable Acid Lake

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Author(s)

Abstract

The Japanese dace (Tribolodon hakonensis) is the only teleost species that inhabits Lake Osorezan, a remarkable acid lake in Japan with the water pH of 3.4-3.8. In the present study, physiological changes following transfer of the dace acclimated to neutral stream water (pH6.8-7.2) to acid lake water (pH3.6-3.7) were examined with special reference to changes in gill chloride cell morphology. The dace survived direct transfer to acid lake water for 3 days. Plasma [Na+] and [CI-] showed transient decreases at 1 hr after transfer; however, the decrease in [Na+] was greater than that in [CI-]. The recovery of [CI-] was more evident than that of [Na+]. The transient decreases of plasma [Na+] and [CI-] were followed by acidosis. Blood pH was decreased by 0.13 unit at 6 hr, but partially restored by 24 hr. In the dace acclimated to neutral stream water, chloride cells were scattered in the gill filament. Following transfer to acid lake water, however, well-developed chloride cells were arranged in aradial fashion, forming follicular or gland-like structures in the gills. Each chloride cell was equipped with an apical pit, which faced a common lumen leading to the external environment. These findings provide morphological evidence for a significant role(s) of gill chloride cells in ion and acid-base regulation in the acid-tolerant dace.

Journal

  • ZOOLOGICAL SCIENCE

    ZOOLOGICAL SCIENCE 16(6), 871-877, 1999-12-15

    The Zoological Society of Japan

References:  35

Cited by:  4

Codes

  • NII Article ID (NAID)
    110003370389
  • NII NACSIS-CAT ID (NCID)
    AA10545874
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    02890003
  • NDL Article ID
    4944602
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z53-Y164
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE  NDL-Digital 
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