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Table 2.

Changes in arterial plasma concentrations of free amino acid-N,creatinine-N, glucose and β-hydroxybutyrate in dogfish subjected to either experimental feeding or the control treatment

Pre-feeding2 h4 h6 h9 h18 h24 h34 h45 h
FAA-N (mmol-N l-1         
    Fed 11.8±0.6 11.8±0.6 12.0±0.6 11.7±0.5 11.7±0.5 11.5±0.5 11.5±0.5 11.4±0.5 11.3±0.4 
    Control 12.7±0.6 13.1±0.6 13.0±0.8 13.2±0.6 12.7±0.6 12.4±0.6 12.4±0.6 12.2±0.6 12.0±0.6 
Creatinine-N (mmol-N l-1         
    Fed 0.14±0.01 0.15±0.01 0.15±0.02 0.14±0.01 0.14±0.01 0.14±0.02 0.13±0.01 0.13±0.01 0.13±0.02 
    Control 0.15±0.1 0.14±0.01 0.14±0.01 0.15±0.01 0.14±0.01 0.14±0.01 0.14±0.01 0.14±0.01 0.13±0.01 
Glucose (mmol l-1         
    Fed 6.7±0.5 6.9±0.6 6.4±0.5 6.6±0.7 6.2±0.7 6.5±0.8 7.1±0.7 7.4±1.0 6.8±0.9 
    Control 5.7±0.9 6.3±0.8 6.0±0.7 5.8±0.7 5.9±0.7 6.0±0.7 6.1±0.7 6.1±0.6 6.4±0.7 
β-HB (mmol l-1         
    Fed 3.8±1.0 3.8±1.0 3.7±1.1 3.4±1.0 3.4±1.1 3.4±1.1 3.2±1.2 2.6±1.2 2.2±0.9 
    Control 5.2±0.9 4.5±1.0 4.6±0.9 4.7±1.0 4.8±1.0 4.7±1.1 4.6±1.3 4.3±1.2 4.6±1.2 
Pre-feeding2 h4 h6 h9 h18 h24 h34 h45 h
FAA-N (mmol-N l-1         
    Fed 11.8±0.6 11.8±0.6 12.0±0.6 11.7±0.5 11.7±0.5 11.5±0.5 11.5±0.5 11.4±0.5 11.3±0.4 
    Control 12.7±0.6 13.1±0.6 13.0±0.8 13.2±0.6 12.7±0.6 12.4±0.6 12.4±0.6 12.2±0.6 12.0±0.6 
Creatinine-N (mmol-N l-1         
    Fed 0.14±0.01 0.15±0.01 0.15±0.02 0.14±0.01 0.14±0.01 0.14±0.02 0.13±0.01 0.13±0.01 0.13±0.02 
    Control 0.15±0.1 0.14±0.01 0.14±0.01 0.15±0.01 0.14±0.01 0.14±0.01 0.14±0.01 0.14±0.01 0.13±0.01 
Glucose (mmol l-1         
    Fed 6.7±0.5 6.9±0.6 6.4±0.5 6.6±0.7 6.2±0.7 6.5±0.8 7.1±0.7 7.4±1.0 6.8±0.9 
    Control 5.7±0.9 6.3±0.8 6.0±0.7 5.8±0.7 5.9±0.7 6.0±0.7 6.1±0.7 6.1±0.6 6.4±0.7 
β-HB (mmol l-1         
    Fed 3.8±1.0 3.8±1.0 3.7±1.1 3.4±1.0 3.4±1.1 3.4±1.1 3.2±1.2 2.6±1.2 2.2±0.9 
    Control 5.2±0.9 4.5±1.0 4.6±0.9 4.7±1.0 4.8±1.0 4.7±1.1 4.6±1.3 4.3±1.2 4.6±1.2 

An experimental meal comprised a gastric loading of 20 g flatfish muscle paste in 20 ml of 140 mmol l-1 NaCl saline per kg dogfish, while the control treatment comprised a gastric loading of 40 ml of 140 mmol l-1 NaCl saline per kg dogfish.

Values are means ± 1 s.e.m. (N=8); designates a significant overall effect of feeding(two-way ANOVA, P≤0.05). There were no significant differences(P>0.05) within treatment groups or between control and experimental treatments at specific times. FAA-N, free amino acid-N;β-HB, β-hydroxybutyrate.

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