Table 4. Carbon dioxide (CO 2) and ammonium (NH 4+) concentration between fed group and starved group of Far Eastern catfish, Silurus asotus

Time (hrs)	CO2 concentration (mg/L)1)		Ammonium (NH4+)1)
	Fed group	Starved group	Fed group	Starved group
Pre-experiment	5.1b±0.38	5.1a±0.41	0	0
6	14.2b±1.28	13.0a±1.19	0.13b±0.012	0.08a±0.061
12	17.2b±1.53	14.6a±1.21	0.17b±0.015	0.11a±0.018
18	18.4b±1.67	16.4a±1.59	0.19b±0.017	0.14a±0.013
24	20.0b±1.99	18.6a±1.87	0.23b±0.020	0.15a±0.014
30	20.8b±4.89	19.4a±1.78	0.24b±0.019	0.16a±0.015
36	21.2b±2.03	20.0a±1.90	0.26b±0.018	0.17a±0.016
42	21.6b±2.10	20.4a±1.98	0.28b±0.209	0.18a±0.017
48	22.0b±2.15	20.6a±2.12	0.29b±0.213	0.19a±0.017

Difference between fed group and starved group is significant at this level (p<0.05). The values are means of triplicate experiments.