溶氧对齐口裂腹鱼幼鱼呼吸代谢的影响

以中国地质公园（神农架）野生动物繁育基地提供的齐口裂腹鱼（SchiZOthornzprenanti）幼鱼（体长15．O～18．6cm，体质量44．0～76．6g）为研究对象，采用自制呼吸代谢测定装置，研究了溶氧（Dissolvedoxygen，DO）对齐口裂腹鱼幼鱼呼吸代谢的影响．结果表明：1）25℃时齐口裂腹鱼窒息点为（0．57±0．03）mg／L；2）运用FishLSDTest检验得溶氧对耗氧率有显著影响（P＜0．05），溶氧和耗氧率的非线性回归方程为：MO2=268．24—300．24×e-1（Re=0．965），从高溶氧开始，随溶氧下降，齐口裂腹鱼耗氧率首先维持平稳，然后缓慢降低，最后快速降低直至窒息点，因此齐口裂腹鱼为氧调节型鱼类，临界溶氧浓度为（2．5±0．5）mg／L；3）齐口裂腹鱼维持耗氧率稳定（或称耐低氧能力）参数K1／K2为0．82．研究为鱼类养殖和运输提供理论依据．

Effect of Dissolved Oxygen on Respiratory Metabolism of Juvenile Schizothorax Prenanti

The effect of dissolved oxygen of respiratory metabolism of juvenile Schizothorax prenanti （Body length： 15.0-18.6 cm, body mass- 44.0-76.6 g） which are provided by a wild animal breeding base in the National Geopark in Shennongjia, China, are studied in respiratory metabolism equipment. The results indicate： （1） The suffocation point of Schizothorax prenanti is （0.57±0.03） mg/L at 25℃ （2） The effect of dissolved oxygen on oxygen consumption rate is significant （P〈0.05） based on Fish LSD Test. The nonlinear regression function between dissolved oxygen and oxygen consumption rate is MO2 = 268. 24- 300. 24 ）〈 e-1 4SXDO （R2= 0. 965）. From high dissolved oxygen to low dissolved oxygen, the oxygen consumption rate remains stable; and then decreases slowly; at last, it decreases rapidly till suffocation point, which indicates they are oxyregulators. The critical dissolved oxygen is （2.5±0.5） mg/L. （3） K1/K2 that shows the capa- bility of maintaining consumption stable （hypoxia tolerance） is 0.82 in Schizothorax prenanti. This study will contribute to the theoretical requirement for cultivation and transportation of Schizothorax prenanti.