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Title
Japanese:タチウオのホバリング戦略 
English:Hovering Strategy of the Largehead Hairtail (Trichiurus lepturus) 
Author
Japanese: Gen Li, 田中博人.  
English: Gen Li, Hiroto Tanaka.  
Language Japanese 
Journal/Book name
Japanese:第51回エアロ・アクアバイオメカニズム学会講演会資料集 
English: 
Volume, Number, Page         pp. 4–5
Published date Mar. 17, 2026 
Publisher
Japanese: 
English: 
Conference name
Japanese:第51回エアロ・アクアバイオメカニズム学会講演会 
English: 
Conference site
Japanese:東京 
English: 
Abstract The vertical hovering behavior of the largehead hairtail (Trichiurus lepturus) represents an unusual example of extreme morphological and behavioral specialization among fishes. Unlike most hovering species that depend on continuous fin or body corrections, hairtails sustain a steep head-up posture with minimal muscular effort, relying largely on passive stability. By combining behavioral observations with hydrodynamic modeling, we examine how this species reconciles stability, maneuverability, and energy economy. The dorsoventrally streamlined body reduces drag and mitigates vortex-induced vibrations, while the longitudinal offset between the centers of mass and buoyancy produces a stabilizing hydrostatic torque. This arrangement enables energetically efficient station-keeping. Adjustable dorsal fin deployment further regulates yaw stability, allowing either passive turning or full directional stabilization depending on context.

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