Abstract: The oxygen consumption rate,oxygen consumption amount and asphyxial point were measured in Asiatic brook lamprey Lampetra reissneri with different body weight by a flow-through chamber and static chamber at different temperature.There were significant rhythms of oxygen consumption in the adult lamprey with body weigh(8.59 ±0.20)g,and the juveniles with body weight(5.42±0.10)g and(5.27±0.17)g.The peak oxygen consumption rate(0.167±0.022)mg/g·h and the minium oxygen consumption rate(0.035±0.003)mg/g·h in the adult lamprey with body weight(8.59±0.20)g were observed at 8:00 and 16:00,respectively.For the lamprey with body weight(5.42 g±0.10 g),however,the peak oxygen consumption rate(0.192±0.036)mg/g·h and the minium oxygen consumption rate(0.051±0.016)mg/g·h were found at 8:00和16:00,respectively.Moreover,the peak oxygen consumption rate(0.119±0.027)mg/g·h and the minium oxygen consumption rate(0.038±0.013)mg/ g·h in the juveniles with body weight(5.27 g±0.17)g were occurred at 18:00 and 14:00,respectively.There was a positive relationship between water temperature(1-20℃)and oxygen consumption rate in the adult lamprey:Y=0.0254X0.9115(R2=0.8516)(body weight:10.45 g±0.13)g and Y=0.0272X0.9406(R2=0.8840) (body weight:4.65 g±0.07)g.Furthermore,the oxygen consumption rate and oxygen consumption amount of the juveniles with body weight(5.92 g±0.05 g)increased with the increase in temperature.The negative relationship between the point of the lamprey with body weight(10.67 g±0.18 g)and temperature(1-15℃)was expressed as the equation:Y=0.2224X-0.3945(R2=0.971)while there was a positive relationship between the asphyxial point of the adult lamprey and temperature(15-20℃),and a negatively relationship between the asphyxial point of the adult lamprey with body weight(5.46 g±0.12 g)and temperature(1-10℃)as the equation:Y=0.4427X-0.6561(R2=0.8866).In 15-20℃,the asphyxial point of the lamprey with body weight(5.74 g±0.83 g)was increased with the increase in temperature as the equation:Y=0.3008X-0.4003(R2=0.8581)(P＜0.05).There was significantly difference between the oxygen consumption of adult lamprey with body(10.10 g±0.13 g)and(4.79 g±0. 08 g)(P＜0.05),but there were no significant difference between the oxygen consumption rates(P＞0.05).There were no significant difference in the juveniles with body weight(7.60 g±0.15 g),and(4.79 g±0.09 g)(P＞0. 05).
2011, Vol. 26 
