Deep-water observation of scalloped hammerhead Sphyrna lewini in the western Indian Ocean off Tanzania
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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.
| Original language | English |
|---|---|
| Journal | Marine Biodiversity Records |
| Volume | 8 |
| Issue number | e91 |
| DOIs | |
| Publication status | Published - 2015 |