1. Life Science College, East China Normal University, Shanghai 200062, China; 2. Department of Fishery Science, Tianjin Agricultural Univer sity, City Key Laboratory of Aqua - Ecology and Aquaculture, Tianjin 300384, China; 3. East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 4. College of Life Science, Shanghai Fisheries University, Shanghai 200090, China
Abstract: The oxygen consumption rate and asphyxial point were determined in juvenile Amur sturgeon （Acipenser schrenckii） which had been acclimated to sea water （ a salinity of 28） and fresh water at （20. 0 ±0. 2）℃ for up to 14 days. The fish had a mean oxygen consumption rate of （235.10 ±37.70） mg/（ kg ·h） in seawater, significantly higher than the fish （202. 20 ＋30. 12）mg/（kg·h） acclimated in freshwater （P 〈0. 05） had. Meanwhile, the asphyxiation point was （0. 94 ±0. 02）mg,/L in the fish in seawater, significantly higher than that in freshwater （ 0. 84±0. 01 ） mg/L （ P 〈 0. 05 ）. The peak oxygen consumption occurred at 8：00 and 22：00 in the fish in sea water, and decreased to the lowest at 18：00 and 0：00 for the fish acclimated both in sea and fresh water. Therefore, these results suggested that the tolerance of hypoxia in seawater was still low for the juveniles acclimated to sea water for 14 days, and the physiological responds of the fish acclimated in sea water were similar to those cultured in freshwater. Comparison of this study with other, the resting metabolic rate of Amur sturgeon was higher than that of other freshwater fish.
2007, Vol. 22 
