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Deep-water observation of scalloped hammerhead Sphyrna lewini in the western Indian Ocean off Tanzania

Published online by Cambridge University Press:  24 June 2015

Alec B.M. Moore  and
Andrew R. Gates
Alec B.M. Moore
Affiliation:
RSK Environment Ltd., Spring Lodge, 172 Chester Road, Helsby, Cheshire WA6 0AR, UK
Andrew R. Gates*
Affiliation:
National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton SO14 3ZH, UK
*
Correspondence should be addressed to: A.R. Gates, National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZHUK email: arg3@noc.ac.uk
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Abstract

A scalloped hammerhead Sphyrna lewini was observed opportunistically from a remotely operated vehicle 1 m off the seabed at 1042 m depth, during hydrocarbon exploration activities in the Ruvuma Basin off Tanzania. The observation, which occurred during night hours, is the deepest accurately recorded for this species and the first deep-water record for the Indian Ocean. The record adds support for the occurrence in deep water during night hours being a widespread and possibly common behaviour in this species, and further expands a small but growing literature that meso- and bathypelagic environments may be of greater importance to elasmobranchs previously considered to be primarily epipelagic.

Keywords

sharkelasmobranchbathypelagicRuvuma Basinvertical migration
Type
Research Article
Information
Marine Biodiversity Records , Volume 8 , 2015 , e91
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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