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

Moore, Alec B.M.; Gates, Andrew R.. 2015 Deep-water observation of scalloped hammerhead Sphyrna lewini in the western Indian Ocean off Tanzania. Marine Biodiversity Records, 8. https://doi.org/10.1017/S1755267215000627

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1017/S1755267215000627
ISSN: 1755-2672
Additional Keywords: shark; elasmobranch; bathypelagic; Ruvuma Basin; vertical migration
Date made live: 17 Mar 2016 15:26 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513283

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