Please use this identifier to cite or link to this item: https://doi.org/10.1007/BF01987613
Title: Osmoregulation in the mudskipper, Boleophthalmus boddaerti II. transepithelial potential and hormonal control
Authors: Lee, C.G.L.
Low, W.P.
Lam, T.J. 
Munro, A.D. 
Ip, Y.K. 
Keywords: Boleophthalmus boddaerti
Cl--ATPase
cortisol
HCO3 -
hormone
mudskipper
Na+,K+-ATPase
osmoregulation
prolactin
transepithelial potential
Issue Date: Mar-1991
Citation: Lee, C.G.L., Low, W.P., Lam, T.J., Munro, A.D., Ip, Y.K. (1991-03). Osmoregulation in the mudskipper, Boleophthalmus boddaerti II. transepithelial potential and hormonal control. Fish Physiology and Biochemistry 9 (1) : 69-75. ScholarBank@NUS Repository. https://doi.org/10.1007/BF01987613
Abstract: 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+-K+ activated adenosine triphosphatase (Na+,K+-ATPase) activity but increased the activity of branchial HCO3 --Cl- stimulated adenosine triphosphatase (HCO3 -,Cl--ATPase) in B. boddaerti exposed to 10% sw. However, survival in 10% sw was not significantly impaired by hypophysectomy and no significant change in plasma osmolality and plasma Na+ and Cl- concentrations was observed. Various doses of ovine-prolactin or salmon-prolactin were unable to restore the TEP of hypophysectomized B. boddaerti in 10% sw to that of the sham-operated fish. However, 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+ and Cl- contents and branchial Na+,K+-ATPase and HCO3 -,Cl--ATPase activities. Overall, the hormonal control of osmoregulation in B. boddaerti appeared to differ from that of other teleosts. © 1991 Kugler Publications, Amsterdam/Berkeley.
Source Title: Fish Physiology and Biochemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/106861
ISSN: 09201742
DOI: 10.1007/BF01987613
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