| 摘要: |
| 于1991年9月 - 1992年7月，运用连续流水式呼吸仪测定由嘉陵江捕获的南方鲇成鱼（2.085－6.810kg）的静止代谢率，在10.0，13.3，16.0，21.8，22.2和27.4℃条件下，雌鱼的测定值是8.699，21.980，25.412，30.563，34.463和32.483 O2 mg/(kg?h)；雄鱼的是8.146，19.568，26.830，29.426，32.156和32.098 O2 mg/(kg?h)。采用统计模型，将测定值调整为标准状态（20°C；雌鱼：4.126kg，雄鱼：2.890kg）下的静止代谢率。结果表明，雌、雄鱼静止代谢率的周年曲线均为双峰型，在繁殖季节（3 - 5月）和性产物迅速积累期（9 - 11月）较高，7月次之，1月份最低；该种鱼静止代谢率的年周期变化与其繁殖活动及性腺发育的周期相关。雌鱼静止代谢的年能量需求为29.5×102 J/(kg?a)，雄鱼的为28.8×102 J/(kg?a)，表明这种大型专性肉食性鱼类的静止代谢水平低于文献报道的其他几种鱼。 |
| 关键词: 鱼类能量学 静止代谢 季节变化 繁殖 南方鲇 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，39070143号 |
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| SEASONAL CHANGES IN RESTING METABOLISM OF THE ADULT SILURUS MERIDIONALIS |
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Cho Zhendong1, Xie Xiaojun2
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1.Department of Biology, Chongqing Teachers College, Chongqing 630047;2.Department of Biology, Southwest China Teachers University, Chongqing 630715
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| Abstract: |
| The resting metabolic rates of 2.085 - 6.810 kg adult Silurus meriziionalis collected from the Jialingjiang River were measured with continuous-flow respirometers from Sep. 1991 to July 1992. At 10.0, 13.3, 16.0, 21.8, 22.2 and 27.4°C, the measured values were 8.699, 21.980, 25.412, 30.563, 34.463 and 32.483 O2 mg/(kg?h) in the female, and 8.146, 19.568, 26.830, 29.426, 32.156 and 32.098 O2 mg/(kg?h) in the male, respectively. From the values, the metabolic rates at the standard conditions (20°C; Female: 4.126 kg, Male: 2.890 kg) were converted by a statistical model. The results showed two peaks on the annual curves of the resting metabolic rates in both the male and the female. The rates March to May (the spawning season) and in Sep. to Nov. (when sexual products accumulate rapidly) were higher than those in other seasons, lower in July (summer), lowest in January (winter), indicating the annual changes in the metabolism correlated with the gonad development and reproduction activities of the fish. The annual energy requirements for resting metabolism were 28.8×102 J/(kg?a) in the male and 29.5×102 J/(kg?a) in the female. It is suggested that the level of resting metabolism in the fish, a large-size piscivore, is lower than those reported in several other fish species. |
| Key words: Fish energetic, Resting metabolism, Seasonal changes, Reproduction, Silurus meridionalis |
