摘要： 在自然界中生物体为了生存，必须适应光周期即昼夜光循环这一重要的环境变化，研究许氏平鲉幼鱼对不同光周期的反应，设定5种不同光周期（24 L:0 D、16 L:8 D、12 L:12 D、8 L:16 D、0 L:24 D）条件，观察了不同条件下许氏平鲉行为、生长和生理的变化。结果显示：8 L:16 D光周期条件下许氏平鲉个体间距离较为稳定，群体排列更加整齐，而24 L:0 D和0 L:24 D光周期条件下许氏平鲉凝聚力和协调性均有所下降；试验结束时8 L:16 D光周期条件下体长体质量显著高于其他光周期条件（P＜0.05）；24 L:0 D光周期条件下许氏平鲉血浆中皮质醇浓度和葡萄糖含量均高于其他试验组，16 L:8 D光周期条件下许氏平鲉血浆中谷草和谷丙转氨酶活力均呈现升高趋势。8 L:16 D光周期条件下会提升鱼群的凝聚力和协调性，使许氏平鲉更倾向于集群运动，同时也有利于许氏平鲉生长摄食，而24 L:0 D和0 L:24 D光周期条件下许氏平鲉群体行为表现不佳，24 L:0 D和16 L:8 D光周期条件不利于许氏平鲉生理代谢。研究结果为许氏平鲉增养殖光环境优化提供了参考依据。

关键词: 光周期, 许氏平鲉, 行为, 生长, 生理

Abstract: n order to survive in nature, organisms must adapt to the important environmental changes of the photoperiod, namely the day night light cycle. This study aims to investigate the response of juvenile Sebastes schlegelii to different photoperiods, five different photoperiod conditions (24 L: 0 D, 16 L: 8 D, 12 L: 12 D, 8 L: 16 D, 0 L: 24 D) were set up to observe the changes in behavior, growth, and physiology of Sebastes schlegelii under different conditions. It was found that under the 8 L:16 D photoperiod condition, the distance between individuals of the Sebastes schlegelii was relatively stable, and the group arrangement was more orderly, while under the 24 L: 0 D and 0 L: 24 D photoperiod conditions, the cohesion and coordination of the Sebastes schlegelii decreased; At the end of the experiment, the body length and weight under 8 L:16 D photoperiod conditions were significantly higher than those under other photoperiod conditions (P<0.05), and the feeding situation was good; Under 24 L:0 D photoperiod conditions, the cortisol concentration and glucose content in the plasma of Sebastes schlegelii were higher than under other experimental groups. Under 16 L: 8 D photoperiod conditions, the activities of aspartate aminotransferase and alanine aminotransferase in the plasma of Sebastes schlegelii showed an increasing trend. The results showed that under the 8 L: 16 D photoperiod conditions, the cohesion and coordination of the fish population were enhanced, making the Sebastes schlegelii more inclined to move in clusters, and also beneficial for its growth and feeding. However, under the 24 L: 0 D and 0 L: 24 D photoperiod conditions, the behavior of the Sebastes schlegelii population was poor, and the 24 L: 0 D and 16 L: 8 D photoperiod conditions were not conducive to the physiological metabolism of the Sebastes schlegelii. In summary, the results of this study aim to provide a reference for optimizing the light environment for the cultivation of Sebastes schlegelii.

Key words: photoperiod, Sebastes schlegelii, behavior, growth, physiology