Laboratory of Evolutionary Physiology and Behaviour, Chongqing Key Laboratory of Animal Biology, Chongqing Normal University, Chongqing, 400047, China.
J Comp Physiol B. 2012 Jul;182(5):641-50. doi: 10.1007/s00360-012-0644-0. Epub 2012 Jan 11.
To test whether the effects of water oxygen concentration ([O(2)]) on the metabolic interaction between locomotion and digestion differ between fish species with different locomotive and digestive behaviours in normoxia, we investigated the swimming performance of fasted and fed fish at water [O(2)] of 1, 2 and 8 (normoxia) mg L(-1) (2.5, 5 and 20 kPa) at 25°C in three juvenile Cyprinidae fish species: goldfish (Carassius auratus), common carp (Cyprinus carpio) and qingbo (Spinibarbus sinensis). Digestion, taxon and water [O(2)] all had significant effects on the pre-exercise oxygen consumption rate [Formula: see text] and the swimming performance (P < 0.05). Among the three fishes, qingbo showed the highest swimming performance and the lowest feeding [Formula: see text] at the saturated water [O(2)], and its active oxygen consumption rate [Formula: see text] and critical swimming speed (U (crit)) decreased the most with decreases in water [O(2)]. Qingbo exhibited a locomotion-priority metabolic mode at all three water [O(2)]. Digestion was sacrificed to locomotion in a postprandial swimming situation, but fed qingbo could not maintain their U (crit) at water [O(2)] of 2 and 1 mg L(-1). Goldfish showed the lowest swimming performance and the highest feeding [Formula: see text] at the saturated water [O(2)]. They exhibited a digestion-priority metabolic mode at high water [O(2)]. However, with a decrease in water [O(2)], the feeding [Formula: see text] decreased more acutely than the respiratory capacity; thus, digestion and locomotion performed independently in a postprandial swimming situation (i.e., an additive metabolic mode) at a water [O(2)] of 1 mg L(-1). The common carp showed moderate and balanced swimming performance and feeding [Formula: see text] at the saturated water [O(2)], and exhibited an additive metabolic mode at all 3 water [O(2)], because digestion, swimming and respiratory capacities decreased in parallel with the decrease in water [O(2)].
为了检验在常氧条件下，不同运动和消化行为鱼类对水氧浓度([O2])的代谢互作效应是否存在差异，我们在 25℃下，研究了空腹和摄食状态下三种幼鱼（金鱼、鲤鱼和青波）在水氧浓度为 1、2 和 8mg/L（常氧下分别为 2.5、5 和 20kPa）时的游泳性能。摄食、类群和水氧浓度均对空腹耗氧率[Formula: see text]和游泳性能（P＜0.05）有显著影响。在这三种鱼中，青波在饱和水氧浓度下表现出最高的游泳性能和最低的摄食[Formula: see text]，其有氧代谢率[Formula: see text]和临界游泳速度（U(crit)）随水氧浓度的降低而降低最多。青波在所有三种水氧浓度下都表现出运动优先的代谢模式。在摄食后的游泳状态下，消化优先于运动，但摄食后的青波在水氧浓度为 2 和 1mg/L 时无法维持其 U(crit)。金鱼在饱和水氧浓度下表现出最低的游泳性能和最高的摄食[Formula: see text]，它们在高水氧浓度下表现出消化优先的代谢模式。然而，随着水氧浓度的降低，摄食[Formula: see text]比呼吸能力下降得更剧烈，因此在摄食后的游泳状态下，消化和运动独立发挥作用（即附加代谢模式），在 1mg/L 水氧浓度下。鲤鱼在饱和水氧浓度下表现出中等和平衡的游泳性能和摄食[Formula: see text]，在所有三种水氧浓度下均表现出附加代谢模式，因为消化、游泳和呼吸能力都随水氧浓度的降低而平行下降。
