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Hydromechanical study of swim-and-glide behaviour on free-ranging flatfish

自由放养比目鱼游泳和滑行行为的流体力学研究

基本信息

批准号：
12660157
负责人：
NASHIMOTO Katsuaki
金额：
$ 2.5万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Intermittent swimming behaviour of marine fish with negative buoyancy, such as swim-glide behaviour, has been hypothesized to result in a saving of energy required for locomotion between two points. However, there have been no studies that tried to prove this hypothesis in the wild. This has been due in part to the difficulty of observing and monitoring free-ranging fish in the open sea. Previous conventional tagging experiments have indicated that Japanese flounder, Paralichthys olivaceus, sometimes migrated in the far distance, recaptured 1,000 km from the point of release, despite their lower swimming ability and morphological feature without swim bladder.In order to measure energetic cost of free-ranging flatfish during migration, it is important to know the activity and time budgets of flatfish on its migration route. Using a depth and acceleration data-logger on Japanese flounders, we obtained continuous record of swimming speed, depth, tailbeat activity and swimming angle of free-ranging flounders, simultaneously. We estimated and compared the migrating energy costs during continuous swim and swim-glide.We were successful in direct measurement of swim-glide behaviour from flatfish using tailbeat profiles recorded by the logger for the first time. Compared the migration cost between continuous swim and swim-glide, covering similar distance, migration by adopting swim-glide technique resulted in a 22.3% reduction in number of tailbeats. Thus, this energy-saving strategy allows flatfish with negative buoyancy to migrate the long-distance.

具有负浮力的海洋鱼类的间歇性游泳行为，例如游泳滑行行为，已经被假设为导致在两点之间运动所需的能量的节省。然而，还没有研究试图在野外证明这一假设。部分原因是难以观察和监测公海上自由活动的鱼类。以往的标记实验表明，尽管牙鲆（Paralichthys olivaceus）的游泳能力较低，而且没有鱼鳔，但它有时会远距离洄游，并在距离释放点1,000 km处重新捕获。为了测量比目鱼在洄游过程中的能量消耗，了解比目鱼在洄游路线上的活动和时间分配是很重要的。利用一台深度和加速度数据记录仪对比目鱼进行了连续记录，同时获得了自由放养比目鱼的游泳速度、深度、尾拍活动和游泳角度。我们估计并比较了迁移的能量成本在连续的游泳和游泳glide.We成功地直接测量的游泳滑行行为从比目鱼使用尾拍配置文件记录的记录器首次。在距离相近的情况下，连续游动和游动-滑行的迁移代价比较，采用游动-滑行技术的迁移尾拍数减少了22.3%。因此，这种节能策略允许比目鱼与负浮力迁移的长距离。