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Intestinal water transport and chloride pump in relation to sea-water adaptation of the eel,Anguilla japonica

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
52
Issue
1
Identifiers
DOI: 10.1016/s0300-9629(75)80158-7
Keywords
  • Intestine
  • Sea-Water Adaptation
  • Chloride Pump
  • Potential Difference
  • Osmotic Permeability
  • Streaming Potential
  • Passive Sodium Flux
  • Anguilla Japonica

Abstract

Abstract 1. The electrical potential difference (PD) and net water flux across the everted eel intestinal sac were estimated with a same preparation. 2. The water flux was closely correlated with serosa-negativity of the PD in sea-water eels but not in fresh-water eels. Similar situations were found in the conger eel (marine) and goldfish (fresh water). 3. When Cl − concentration of bathing solution was diminished, the high rate of water flux in sea-water eels decreased to a low level of fresh-water eels. 4. Osmotic permeability was six times higher in sea-water eels than in fresh-water eels. 5. The mechanism of intestinal water transport is discussed in relation to the development of Cl − pump during sea-water adaptation of the eel.

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