Nagaoka Ryota, Katayama Taisei, Higashijima Shin-Ichi, Tanimoto Masashi
Division of Behavioral Neurobiology, National Institute for Basic Biology, Okazaki, Aichi 444-8787, Japan.
Neuronal Networks Research Group, Exploratory Research Center on Life and Living Systems, Okazaki, Aichi 444-8787, Japan.
iScience. 2025 Aug 21;28(9):113416. doi: 10.1016/j.isci.2025.113416. eCollection 2025 Sep 19.
Posture control is crucial for animals. Static posture control in fish remains poorly explored. Recent studies have shown that larval zebrafish perform body flexion during slight roll tilts: the body flexion displaces a gas-filled swim bladder, generating counter-rotation torque for postural recovery through the misalignment of gravity and buoyancy forces. Swim bladder deflation impairs this postural recovery, suggesting its critical role. This static posture control strategy may be utilized by many fish species. However, adult fish differ from larvae in morphology and behavior, raising questions about the generality of this mechanism. Our behavioral analysis showed that adult zebrafish also flexed their body during roll tilts, with flexion persisting until recovery to an upright posture. Similarly to larvae, swim bladder deflation impaired postural recovery. These results demonstrate that adult fish employ static roll posture control through body flexion and suggest the generality of this mechanism in fish species.
姿势控制对动物至关重要。鱼类的静态姿势控制仍未得到充分研究。最近的研究表明，幼体斑马鱼在轻微侧倾时会进行身体弯曲：身体弯曲会使充满气体的鱼鳔移位，通过重力和浮力的错位产生反向旋转扭矩以恢复姿势。鱼鳔放气会损害这种姿势恢复，表明其关键作用。这种静态姿势控制策略可能被许多鱼类利用。然而，成年鱼在形态和行为上与幼体不同，这引发了关于这种机制普遍性的问题。我们的行为分析表明，成年斑马鱼在侧倾时也会弯曲身体，弯曲会持续到恢复直立姿势。与幼体相似，鱼鳔放气会损害姿势恢复。这些结果表明成年鱼通过身体弯曲采用静态侧倾姿势控制，并表明这种机制在鱼类中的普遍性。
