Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
J Exp Biol. 2012 Aug 15;215(Pt 16):2751-9. doi: 10.1242/jeb.065052.
Sedentary and territorial rockfish of the genus Sebastes exhibit distinctive homing ability and can travel back to an original location after displacements of metres or even kilometres. However, little is known about the behavioural and sensory mechanisms involved in homing. Although our previous study demonstrated that nocturnal black rockfish Sebastes cheni predominantly use their olfactory sense for homing from an unfamiliar area, the possibility of using landmarks in a familiar area cannot be discounted; i.e. site-specific fish are likely to use three-dimensional spatial memory for navigation and orientation. Using high-resolution acoustic telemetry, we investigated whether S. cheni exhibit distinctive homing paths. Results show that all of the eight rockfish increased their effort within a small area of an unfamiliar region around the release site just after displacement, suggesting that the rockfish probably searched for the homeward direction. The rockfish showed the search movement in the upstream and/or downstream direction, which did not lead home. Finally, after returning to their familiar area, the rockfish exhibited more directed movements with faster speeds at a shallower depth, which was similar to the depth utilised in daily life as well as that of the fish capture.
sedentary 和 territorial 石斑鱼属鱼类表现出独特的归巢能力，可以在被迁移数米甚至数千米后回到原来的位置。然而，关于参与归巢的行为和感觉机制知之甚少。尽管我们之前的研究表明，夜间活动的黑鲷石斑鱼 Sebastes cheni 主要利用嗅觉来从陌生区域归巢，但不能排除它们在熟悉区域使用地标物的可能性；即特定地点的鱼类可能使用三维空间记忆进行导航和定向。使用高分辨率声学遥测技术，我们研究了 S. cheni 是否表现出独特的归巢路径。结果表明，所有 8 条石斑鱼在被释放后的陌生区域的释放点附近的一个小区域内增加了活动量，这表明这些石斑鱼可能在寻找回家的方向。石斑鱼表现出向上游和/或下游的搜索运动，这并没有把它们带回家。最后，当回到熟悉的区域后，石斑鱼表现出更有方向性的运动，速度更快，深度更浅，这与日常生活中以及鱼类捕捞时的深度相似。
