Deeper-living eels like this cutthroat eel, Synaphobranchus sp., are abundant in the deep ocean and are active day and night in the open.
Cutthroat Eel
Image courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas. Download larger version (jpg, 824 KB).

Deeper-living eels like this cutthroat eel, Synaphobranchus sp., are abundant in the deep ocean and are active day and night in the open.

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