The Stoplight Loosejaw (Malacosteus niger) is a pretty extraordinary fish: a jet-black denizen of the twilight zone, armed with some of the strangest and most spectacular jaws in the animal kingdom and a surprising superpower: it's one of the very, very few creatures down there that can both generate and see red light.

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

plus modified versions of:

Oxygen Garden, Perhaps It Was Not Properly Manufactured, CGI Snake and Divider by Chris Zabriskie, CC BY 4.0