Bioluminescence

Bioluminescence is a type of illumination created by many Flora species and all but three species of Fauna in Subnautica. Most bioluminescent life forms cannot generate light bright enough to help the player with night time navigation.

Bioluminescent Life Forms
Fauna= =Carnivores=

Trivia

 * The Stalker, Lava Lizard and Reaper Leviathans are the only three fauna having no bioluminescent glands.
 * Bioluminescence is used by many real-life animals for counter-illumination, luring prey, attracting mates, confusing predators, mimicking other animals, communication, and as a warning to would-be predators.