Osmoregulation in the mudskipper,Boleophthalmus boddaerti I. Responses of branchial cation activated and anion stimulated adenosine triphosphatases to changes in salinity |
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Authors: | Ip Y K Lee C G L Low W P Lam T J |
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Institution: | (1) Department of Zoology, National University of Singapore, 0511 Kent Ridge, Singapore |
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Abstract: | The mudskipperB. boddaerti, was able to survive in waters of intermediate salinities (4–27). Fish submerged in dechlorinated tap water suffered 60% mortality by the fifth day while 60% of those in 100% sea-water (sw) died after the third day of exposure. After being submerged in 50% or 80% sw for 7 days, the plasma osmolality, plasma Na+ and Cl– concentrations and the branchial Na+ and K+ activated adenosine triphosphatase (Na+,K+-ATPase) activity were significantly higher than those of fish submerged in 10% sw for the same period. However, the activities of the branchial HCO3
– and Cl– stimulated adenosine triphosphatase (HCO3
–,Cl–-ATPase) and carbonic anhydrase of the latter fish were significantly greater than those of the former. Such correlation suggests that Na+,K+-ATPase is important for hyperosmotic adaptation in this fish while HCO3
–-Cl–-ATPase and carbonic anhydrase may be involved in hypoosmotic survival. |
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Keywords: | Boleophthalmus boddaerti mudskipper osmoregulation Na+ K+-ATPase HCO3
– Cl– -ATPase carbonic anhydrase |
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