Abstract: Using hydrostatic water in sealed chamber for measurement, this study compared the change of oxygen consumption rate and ammonia excretion rate of Leuciscus waleckii Dybowski (72.62±3.70)g exposed in high carbonate alkalinity water (CA 50 mmol/L) and high ammonia water (NH4CO3 1.5 mmol/L) for 4 time points (2 h, 4 h, 6 h and 8 h) measurement. Oxygen consumption rate was significantly inhibited in carbonate alkalinity water and high ammonia water when compared that in fresh water (P<0.05). No significant difference of the oxygen consumption rate between carbonate alkalinity and ammonia water treated fish was detected for the last three tested time points, 4, 6, and 8 except for the first testing time point. Results of ammonia excretion rate showed that compared with those in fresh water, the ammonia excretion rate of fish exposed in carbonate alkalinity water and ammonia water was significantly inhibited (P<0.05). In ammonia water, the ammonia excretion rate of L. waleckii Dybowski for all 4 time points decreased, which had an extremely significant difference compared with fresh water and carbonate alkalinity water. Energy metabolism (O∶ N) study found that there had no significant difference in oxygen-nitrogen ratio in fish between fresh water and carbonate alkalinity water. However, compared with fish in fresh water and carbonate alkalinity water, fish in ammonia water had an extremely significant difference in oxygen-nitrogen ratio. 

Key words: Leuciscus waleckii Dybowski, carbonate alkalinity, oxygen consumption rate, ammonia excretion rate, oxygen-nitrogen ratio