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First published online May 13, 2004
Journal of Experimental Biology 207, 1993-2002 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00901
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Dogmas and controversies in the handling of nitrogenous wastes: The effect of feeding and fasting on the excretion of ammonia, urea and other nitrogenous waste products in rainbow trout

Makiko Kajimura*, Sara J. Croke, Chris N. Glover and Chris M. Wood

Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada, L8S 4K1



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  		Fig. 1. The relative contributions of different compounds, expressed as a percentage of total nitrogen excretion, in fed or fasted trout of series 1 with or without anal suturing.

 


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  		Fig. 2. The effect of food ration on (A) oxygen consumption and (B) nitrogen excretion in trout of series 2. Values are means ± S.E.M. [N=6, except fasted (N=12)]. Means sharing the same letter of the same case are not significantly different from one another (P<0.05).

 


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  		Fig. 3. Nitrogen quotient (NQ; left y-axis) and percentage protein use (%; right y-axis) for fasted and fed fish of series 2, calculated on the basis of three different assumptions (see Discussion for details). Values are means ± S.E.M. [N=6, except fasted (N=12)].

 




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