【摘要】 采用密闭流水式呼吸实验方法,研究了不同体重组（（50.94±5.50）g、（103.61±10.48）g、（154.58±7.56）g、（194.56±14.56）g）斑石鲷（Oplegnathus punctatus）在3个不同温度（20、25和30℃）下的耗氧率和排氨率,以及斑石鲷耗氧率、排氨率的昼夜节律变化。研究表明,3个温度条件下斑石鲷耗氧率和排氨率随温度的升高而升高,随体重的增大而降低,斑石鲷白天平均耗氧率为（2.535±0.204）μg·（g·min）^-1,夜间平均耗氧率为（2.531±0.064）μg·（g·min）^-1,其耗氧率的昼夜差异不明显。白天平均排氨率为（0.104±0.007）μg·（g·min）^-1,夜间平均排氨率为（0.083±0.007）μg·（g·min）^-1,白天平均排氨率明显大于夜间。投喂饲料后斑石鲷耗氧率最高点出现在投喂饲料后1³h,最低点出现在投喂饲料后19²3h,耗氧率呈逐渐降低的趋势,排氨率呈先升高后降低的趋势,温度升高使斑石鲷排氨率达到峰值的时间提前。更多还原

【Abstract】 Through closed water breathing experiment,we evaluated the oxygen consumption rate and ammonium excretion rate of Oplegnathus punctatus and their circadian rhythms under the effects of water temperature（20、25and 30 ℃）and different body weights（（50.94±5.50）,（103.61±10.48）,（154.58±7.56）and（194.56±14.56）g）.The results indicated that the oxygen consumption and ammonium excretion rates of O.punctatus increased with temperature and weight but were inversely proportional to weight,The data showed that daily average oxygen consumption rate during the day was（2.535±0.204）μg·（g·min）^-1 and the average oxygen consumption rate in the night was（2.531±0.064）μg·（g·min）^-1.Therefore,the oxygen consumption rate of day and night is not different significantly.Moreover,we found that the average of ammonium excretion rate in the day was（0.104±0.007）μg·（g·min）^-1 and the averageof ammonia excretion rate in the night was（0.083±0.007）μg·（g·min）^-1,and the average of ammonium excretion rate in the daytime was obviously higher.Our further studies found a trend of gradual reduction of the oxygen consumption rate of O.punctatus after feeding with the highest appeared between 1and 3h and the lowest between 19 and 23h,and ammonium excretion rate increased first and then decreased.In addition,we also found that the highest rate of ammonia excretion time advanced when the temperature increased.更多还原