Further Evidence for Na/NH, Exchange in Marine Teleost Fish
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1. Four species of marine teleosts were shown to possess an external-NH4-inhibited Na uptake from 1 mM-NaCl solutions. The inhibition was not due to changes in the transepithelial potential. 2. Injection of 2 μM-NH4/g fish stimulated Na uptake by Opsanus beta and also stimulated ammonia efflux, 50% of which was dependent upon external Na. 3. The ammonia efflux from three species was partially dependent upon external Na. 4. Na/NH4 exchange in O. beta could be reversed so that 22Na efflux could be stimulated by the addition of 200 mM-NH4 to the external solution. 5. These studies show clearly that marine teleosts possess an Na/NH4 exchange system in sea water which results in a net influx of Na into the fish.
1994 ◽
Vol 193
(1)
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pp. 79-95
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2006 ◽
Vol 143
(3)
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pp. 292-298
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2010 ◽
Vol 298
(4)
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pp. R870-R876
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2011 ◽
Vol 182
(1)
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pp. 1-39
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2009 ◽
Vol 297
(6)
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pp. R1645-R1646
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1966 ◽
Vol 17
(4)
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pp. 1137-1140
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1984 ◽
Vol 402
(2)
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pp. 207-210
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