Osmoregulation in the mudskipper, Boleophthalmus boddaerti . 2. Transepithelial potential and hormonal control

Boleophthalmus boddaerti submerged in 10%, 50% and 80% seawater (sw) for 7 days, had whole body transepithelial potentials (TEP) of 3.3, 18.3 and 22.9 mV, respectively. Hypophysectomy significantly decreased the TEP of B. boddaerti and reversed the polarity of the TEP of the fish exposed to 10% sw....

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Bibliographic Details
Published in:Fish physiology and biochemistry 1991-03, Vol.9 (1), p.69-75
Main Authors: Lee, CGL, Low, W P, Lam, T J, Munro, AD, Ip, Y K
Format: Article
Language:English
Subjects:
Boleophthalmus boddaerti
Brackish
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Summary:Boleophthalmus boddaerti submerged in 10%, 50% and 80% seawater (sw) for 7 days, had whole body transepithelial potentials (TEP) of 3.3, 18.3 and 22.9 mV, respectively. Hypophysectomy significantly decreased the TEP of B. boddaerti and reversed the polarity of the TEP of the fish exposed to 10% sw. Hypophysectomy also significantly decreased the branchial Na super(+)-K super(+) activated adenosine triphosphatase (Na super(+),K super(+)-ATPase) activity but increased the activity of branchial HCO sub(3) super(-)-Cl super(-) stimulated adenosine triphosphatase (HCO sub(3) super(-),Cl super(-)-ATPase) in B. boddaerti) exposed to 10% sw. Cortisol increased TEP to a positive value in hypophysectomized B. boddaerti , though it was still lower than the sham-operated control. Cortisol treatment also affected the plasma osmolality, plasma Na super(+) and Cl super(-) contents and branchial Na super(+),K super(+)-ATPase and HCO sub(3) super(-),Cl super(-)-ATPase activities. Overall, the hormonal control of osmoregulation in B. boddaerti) appeared to differ from that of other teleosts.
ISSN:0920-1742
DOI:10.1007/BF01987613