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First published online November 1, 2006
Journal of Experimental Biology 209, 4475-4489 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02557
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Active ammonia transport and excretory nitrogen metabolism in the climbing perch, Anabas testudineus, during 4 days of emersion or 10 minutes of forced exercise on land

Yi L. Tay1, Ai M. Loong1, Kum C. Hiong1, Shi J. Lee1, Yvonne Y. M. Tng1, Nicklaus L. J. Wee1, Serene M. L. Lee1, Wai P. Wong1, Shit F. Chew2, Jonathan M. Wilson3 and Yuen K. Ip1,*

1 Department Of Biological Science, National University Of Singapore, Kent Ridge, Singapore 117543, Republic Of Singapore
2 Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Republic of Singapore
3 Ecofisiologia CIMAR, Rua dos Bragas 289, 4050-123 Porto, Portugal


Figure 1
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  		Fig. 1. Rates (µmol day-1 g-1 fish) of (A) ammonia and (B) urea excretion in Anabas testudineus immersed in water (control; C) for 5 days (N=12 for days 1 to 4 and N=6 for day 5) or exposed to terrestrial conditions (T) for 4 days (N=12) followed by 1 day (N=6) of re-immersion in water. Values are means ± s.e.m. *Significantly different from the corresponding freshwater control condition. {dagger}Significantly different from the corresponding day 1, terrestrial condition.

 

Figure 2
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  		Fig. 2. Concentrations (mmol l-1) of ammonia in water samples collected from the branchial or cutaneous surfaces of the air-facing side or the water-facing side of Anabas testudineus immersed in water and anaesthetized for 15 min on land (control; C) or exposed to terrestrial conditions for 24 h followed with 15 min of anesthetization on land (T). *Significantly different from the corresponding control condition.

 

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© The Company of Biologists Ltd 2006