【摘要】 为了研究不同饥饿时间（0、5、10、15、20、25和30 d）对团头鲂耐低氧F₄幼鱼鳃组织的影响,在温度（25±1.0）℃、溶解氧（7.0±0.5）mg/L条件下,以体质量为（30.5±2.6）g的团头鲂耐低氧F₄幼鱼为研究对象,利用组织切片、扫描电镜技术和分光光度计法研究饥饿胁迫对其鳃组织结构、Na⁺/K⁺-ATP酶和抗氧化酶的影响。酶活性结果显示:随着饥饿时间的延长,团头鲂耐低氧F₄鳃组织的Na⁺/K⁺-ATP、SOD和CAT酶活性逐渐降低（P<0.05）,恢复投喂7 d后基本恢复到正常水平。形态学观察显示:随着饥饿时间延长,团头鲂耐低氧F₄鳃小片平均伸出长度增加（P<0.05）,层间基质的厚度减小（P<0.05）,这种变化导致鳃小片呼吸面积增加和层间基质体积减小（P<0.05）。恢复投喂7 d后,基本恢复到正常投喂时的形态。由此可见,在饥饿胁迫情况下,团头鲂耐低氧F₄幼鱼抗氧化系统受到严重干扰,鱼体主动调整鳃小片呼吸面积适应饥饿胁迫。更多还原

【Abstract】 In order to research the effects of different hunger time（duration 0,5,10,15,20,25 and 30 d）on gills of hypoxia-tolerant F₄ generation of blunt snout bream,the gill microstructure,Na⁺/K⁺-ATPase and antioxidant enzyme of hypoxia-tolerant F₄ generation of blunt snout bream were studied by light,scanning electron microscopy and absorptiometry at（25±1.0）℃ and dissolved oxygen（7.0±0.5）mg/L.The results showed that with the increase of the hunger time,the activity of Na⁺/K⁺-ATP, SOD and CAT in the hypoxia-tolerant F₄ generation of blunt snout bream was gradually decreased and then restored to normal level after 7 days of re-feeding.Gill microstructure observation showed that the protruding lamella lengths were enlarged,which caused the expansion of the lamella surface area,and the height and volume of the ILCM decreased.After 7 days of re-feeding recovery,the changes in gill morphology were reversed.These results indicated that the hunger stress could seriously disturb the antioxidant system,but fish showed the capacity to alter respiratory surface area in response to hunger.更多还原