真鲷耗氧率的初步研究

Preliminary Studies on Oxygen Consumption Rate of Red Sea Bream Pagrosomus major

应用测定流水中溶氧量的方法 ,对真鲷耗氧率进行研究 .结果表明 :真鲷耗氧率随水温的升高而升高 ,鱼平均体重 1 2 0 .6～ 1 3 2 .4g,水温 1 9℃时 ,按鱼体重计 (下同 ) ,耗氧率为 2 .677μg/(g·min) ;2 9℃时 ,耗氧率达 5 .841 μg/(g·min) .真鲷的耗氧量随个体的增大而增大 ,耗氧率则随个体的增大而降低 .在水源 pH7.4、盐度 2 1、水温 1 9℃条件下 ,鱼平均体重 1 2 9.5 g ,耗氧率存在昼夜变化 ,1 7∶0 0耗氧率最高 ,为 (3 .877±0 .2 5 7) μg/(g·min) ,0 7∶0 0耗氧率最低 ,为 (1 .0 3 1 ± 0 .2 5 5 ) μg/(g·min) .真鲷白天的平均耗氧率为 2 .1 62 μg/(g·min) ,夜间的平均耗氧率为 2 .2 71 μg/(g·min) ,其代谢水平的昼夜变化不明显 .

The oxygen consumption of red sea bream Pagrosomus major under different conditions were measured and studied. The results are showed as follows:That the higher the water temperature is, the higher the oxygen consumption rate of Pagrosomus major is. At 19 ℃ and body weight 120.6～132.4g, the rate of oxygen consumption is 2.677μg/(g·min);At 29 ℃ , the rate of oxygen consumption is 5.841μg/(g·min).The oxygen consumption of Pagrosomus major increases as its weight increases,and the oxygen consumption of Pagrosomus major drops as its weight decreasing.There are same changes in the oxygen consumption rate of the Pagrosomus major between day and night.Under conditions where pH=7.4, S‰=21 and the water temperature is 19 ℃ ,Pagrosomus major (x 129.5g) has the maximum oxygen consumption of (3.877±0.257)μg/(g·min) when it is 17∶00 and the minimum oxygen consumption of (1.031± 0.255 )μg/(g·min) when it is 7∶00.The average of oxygen consumption is 2.162μg/(g·min)and 2.271 μg/(g·min) respectively under day and night,the metabolism rate has little variation between day and night.