Deep Sea Bioluminescence — Light in the Dark
Quick Fact
An estimated 76% of deep-sea marine species are bioluminescent — making it the most common form of communication in the ocean.
About This Species
Bioluminescence — the production of light by living organisms — is one of the most widespread phenomena in the ocean. Below 200 metres, where sunlight cannot penetrate, an estimated 76% of marine species produce their own light through chemical reactions. Bioluminescence is used for communication, attracting prey, deterring predators, and finding mates. The anglerfish's glowing lure, the flashing of dinoflagellates in breaking waves, and the blue glow of deep-sea jellyfish are all expressions of this remarkable adaptation.
Why It Matters
The deep ocean is the largest habitat on Earth and remains largely unexplored. Bioluminescent organisms play critical roles in deep-sea food webs and carbon cycling.