Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland
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Photo-grammetric techniques developed for measuring body length and small scale movement patterns of cetaceans were applied to surface swimming basking sharks off the west coast of Scotland. These methods removed the need for close approaches, reducing the likelihood of disturbing the focal animal. Average swimming speed was calculated from the total path length between shark locations measured at approximately one minute intervals. These average speeds varied from 0.49 to 0.73 ms−1 for tracks of between 30 and 170 minutes' duration. Body length measurements ranged between 2.35 and 6.43 m. For ten sharks where body length and swimming speed were measured there was a significant correlation between body length (L) and swimming speed (V) expressed as V = 0.36L033.
Lacey , C , Leaper , R , Moscrop , A , Gillespie , D M , McLanaghan , R & Brown , S 2010 , ' Photo-grammetric measurements of swimming speed and body length of basking sharks observed around the Hebrides, Scotland ' Journal of the Marine Biological Association of the United Kingdom , vol 90 , no. 2 , pp. 361-366 . DOI: 10.1017/S0025315409000769
Journal of the Marine Biological Association of the United Kingdom
Copyright © Marine Biological Association of the United Kingdom 2009. Published by Cambridge University Press
This work was funded and conducted by the International Fund for Animal Welfare.
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