Table 7. Change of carbon dioxide (CO2) concentration dose under the 5 ppm clove oil in river puffer, Takifugu obscurus and tiger puffer, T. rubripes at a simulated transport experiment^*.

Elapsed time (hours)	CO2 (mg/L)
	River puffer		Tiger puffer
	Control	5 ppm	Control	5 ppm
Pre-experiment	00.0a	0.0a	0.0a3	0.0a
1	12.1±1.89a	11.9±2.03a	12.5±2.14a	11.6±1.46a
2	18.2±2.42a	16.3±2.32a	20.0±2.37a	18.5±1.98a
3	27.3±2.78a	25.7±2.84a	29.7±2.72a	24.3±2.38b
4	30.2±2.56a	27.4±3.15a	32.3±2.98a	27.1±2.45b
5	33.8±2.08a	28.9±2.36b	34.6±3.12a	29.8±1.92b
6	35.4±2.34a	31.3±2.52b	37.5±2.68a	32.7±2.96b

^*The values are means of triplicate groups (n=50).

Different small letters indicate significant differences for the different clove oil dose at the same elapsed transporting time (p<0.05).