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Table 3.

A comparison of nitrogen excretion rates in Series 1 between trout that were sutured or unsutured and between fasted and fed treatments (nmol N g-1 h-1)

Sutured (N=16)Unsutured (N=12)
Fasted Total-N 529.7±35.1 499.2±35.3 
 Ammonia-N 360.0±25.5 331.3±37.3 
 Urea-N 45.7±4.5 51.2±5.7 
 Amino acid-N 26.4±3.6 20.7±4.5 
 Protein-N 29.1±4.2 15.7±1.7** 
 Creatinine-N 1.9±0.1 2.1±0.2 
 Creatine-N 2.8±0.6 1.2±0.3* 
 Unknown-N 63.7±8.1 76.9±15.4 
Fed Total-N 751.3±48.3††† 1008.9±78.3**,††† 
 Ammonia-N 396.9±34.3 628.0±56.5**,††† 
 Urea-N 42.1±3.8 75.7±5.6***,†† 
 Amino acid-N 72.1±14.8†† 72.4±11.6††† 
 Protein-N 83.8±9.4††† 41.9±5.5***,††† 
 Creatinine-N 5.3±0.8††† 11.1±1.8*,††† 
 Creatine-N 3.2±0.5 3.2±1.2 
 Unknown-N 147.7±22.1†† 176.6±41.2 
Sutured (N=16)Unsutured (N=12)
Fasted Total-N 529.7±35.1 499.2±35.3 
 Ammonia-N 360.0±25.5 331.3±37.3 
 Urea-N 45.7±4.5 51.2±5.7 
 Amino acid-N 26.4±3.6 20.7±4.5 
 Protein-N 29.1±4.2 15.7±1.7** 
 Creatinine-N 1.9±0.1 2.1±0.2 
 Creatine-N 2.8±0.6 1.2±0.3* 
 Unknown-N 63.7±8.1 76.9±15.4 
Fed Total-N 751.3±48.3††† 1008.9±78.3**,††† 
 Ammonia-N 396.9±34.3 628.0±56.5**,††† 
 Urea-N 42.1±3.8 75.7±5.6***,†† 
 Amino acid-N 72.1±14.8†† 72.4±11.6††† 
 Protein-N 83.8±9.4††† 41.9±5.5***,††† 
 Creatinine-N 5.3±0.8††† 11.1±1.8*,††† 
 Creatine-N 3.2±0.5 3.2±1.2 
 Unknown-N 147.7±22.1†† 176.6±41.2 

Values represent means ± s.e.m. Significant differences at the P=0.05 (*,†), 0.01(**,††), 0.001(***,†††) were tested by t-test. *Significantly different from corresponding sutured groups. Significantly different from corresponding feeding groups.

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