Table 3. Respiratory frequency (gill cover movement) and pH values between fed group and starved group of Far Eastern catfish, Silurus asotus

Time (hrs)	Respiratory frequency (min⁻¹¹⁾		pH¹⁾
Time (hrs)	Fed group	Starved group	Fed group	Starved group
Pre-experiment	101^b±8.7	124^a±9.2	7.6^b±0.51	7.6^a±0.68
6	102^b±8.9	128^a±8.8	6.8^b±0.45	7.1^a±0.61
12	110^b±7.9	135^a±9.9	4.1^b±0.38	5.3^a±0.49
18	100^b±8.5	124^a±10.1	3.7^b±0.25	4.8^a±0.39
24	72^b±5.4	91^a±5.7	3.5^b±0.21	4.6^a±0.38
30	71^b±6.2	91^a±6.0	3.2^b±0.20	4.3^a±0.29
36	67^b±4.5	88^a±4.8	3.0^b±0.21	4.1^a±0.32
42	66^b±4.3	80^a±5.3	2.9^b±0.18	4.0^a±0.28
48	65^b±4.1	77^a±5.0	2.8^b±0.12	3.9^a±0.19

Respiratory frequency was measured while 1 min. Difference between fed group and starved group is significant at this level (p<0.05). The values are means of triplicate experiments.