Brunnschweiler Juerg M
Zoological Institute, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
J R Soc Interface. 2005 Sep 22;2(4):389-91. doi: 10.1098/rsif.2005.0047.
This paper describes the first determination of water-escape velocities in free-ranging sharks. Two approximations are used to estimate the final swimming speed at the moment of penetrating the water surface. Blacktip sharks were videotaped from below the surface and parameters were estimated by analysing the sequences frame by frame. Water-escape velocities averaged 6.3 ms(-1). These velocities for blacktip sharks seem accurate and are similar to estimates obtained for other shark species of similar size.
本文描述了首次对自由游动鲨鱼的出水速度进行的测定。采用两种近似方法来估计穿透水面瞬间的最终游动速度。从水面下方对黑鳍鲨进行录像,并通过逐帧分析序列来估计参数。出水速度平均为6.3米/秒。黑鳍鲨的这些速度似乎是准确的,并且与对其他类似大小鲨鱼物种所获得的估计值相似。