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First published online July 26, 2004
Journal of Experimental Biology 207, 3015-3023 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01137

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Postprandial increases in nitrogenous excretion and urea synthesis in the giant mudskipper Periophthalmodon schlosseri

Yuen K. Ip¹, Chiat K. Lim^1,*, Serene L. M. Lee¹, Wai P. Wong¹ and Shit F. Chew²

¹ Department of Biological Science, National University of Singapore, Kent Ridge, Singapore 117543, Republic of Singapore
² Natural Sciences, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Republic of Singapore

View larger version (25K): [in a new window]   Fig. 1. The amount of ammonia excreted (µmol N 3 h-1 g-1 wet mass fish) by unfed (control; white squares) and fed (grey squares) Periophthalmodon schlosseri at 3 h intervals during the 24 h period post-feeding. Values are means + S.E.M. (N=4). *Significantly different from the corresponding control value, P<0.05. aSignificantly different from 0-3 h, P<0.05; bsignificantly different from 3-6 h, P<0.05.

View larger version (22K): [in a new window]   Fig. 2. The amount of urea excreted (µmol N 3 h-1 g-1 wet mass fish) by unfed (control; white squares) and fed (grey squares) Periophthalmodon schlosseri at 3 h intervals during the 24 h period post-feeding. Values are means + S.E.M. (N=4). *Significantly different from the corresponding control value, P<0.05. aSignificantly different from 0-3 h, P<0.05; bsignificantly different from 3-6 h, P<0.05; csignificantly different from 6-9 h, P<0.05; dsignificantly different from 9-12 h, P<0.05.

View larger version (17K): [in a new window]   Fig. 3. The percentage of total-N excreted as urea-N by unfed (control; white squares) and fed (grey squares) Periophthalmodon schlosseri at 3 h intervals during the 24 h period post-feeding. Values are means + S.E.M. (N=4). *Significantly different from the corresponding control value, P<0.05. aSignificantly different from 0-3 h, P<0.05; bsignificantly different from 3-6 h, P<0.05; csignificantly different from 6-9 h, P<0.05; dsignificantly different from 9-12 h, P<0.05.

View larger version (16K): [in a new window]   Fig. 4. Ammonia content (µmol g-1 wet mass tissue or µmol ml-1 plasma) in muscle (white bars), liver (grey bars), gut (black bars), brain (hatched bars) and plasma (cross-hatched bars) of Periophthalmodon schlosseri during the 24 h period post-feeding. Values are means + S.E.M. (N=4), except for brain and plasma (N=3). aSignificantly different from 0 h control, P<0.05; bsignificantly different from 3 h value, P<0.05; csignificantly different from 6 h value, P<0.05.

View larger version (25K): [in a new window]   Fig. 5. Urea content (µmol g-1 wet mass tissue or µmol ml-1 plasma) in muscle (white bars), liver (grey bars), gut (black bars) and plasma (hatched bars) of Periophthalmodon schlosseri during the 24 h period post-feeding. Values are means + S.E.M. (N=3), except for gut (N=4). aSignificantly different from 0 h control, P<0.05; bsignificantly different from 3 h value, P<0.05; csignificantly different from 6 h value, P<0.05.

View larger version (21K): [in a new window]   Fig. 6. Glutamine contents (µmol g-1 wet mass tissue) in the muscle (white bars), liver (grey bars), gut (black bars) and brain (hatched bars) of the giant mudskipper, Periophthalmodon schlosseri during the subsequent 24 h period post-feeding. Values are means + S.E.M. (N=4), except for the brain (N=3). aSignificantly different from 0 h control, P<0.05; bsignificantly different from 3 h value, P<0.05; csignificantly different from 6 h value, P<0.05.