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

  • Alec B.M. Moore (a1) and Andrew R. Gates (a2)

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.

Corresponding author
Correspondence should be addressed to: A.R. Gates, National Oceanography Centre, University of Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZHUK email:
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Marine Biodiversity Records
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  • EISSN: 1755-2672
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