Bioluminescent

Source: https://subnautica.fandom.com/wiki/Bioluminescence#Fauna

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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
 * Flora
 * Coral

= Carnivores = Ampeel

Biter

Blighter

Boneshark

Crabsquid

Crashfish

Mesmer

River Prowler

Sand Shark

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= Herbivores = Bladderfish

Boomerang

Crimson Ray

Cuddlefish

Eyeye

Garryfish

Gasopod

Ghostray

Holefish

Hoopfish

Hoverfish

Jellyray

Magmarang

Oculus

Peeper

Rabbit Ray

Red Eyeye

Reginald

Spadefish

Spinefish

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= Leviathans = Ghost Leviathan

Reaper Leviathan

Reefback Leviathan

Sea Dragon Leviathan

Sea Emperor Leviathan

Further Sea Emperor Leviathan bioluminescence

Sea Emperor Leviathan Baby

Sea Treader Leviathan

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= Scavengers & Parasites = Bleeder

Blood Crawler

Cave Crawler

Lava Larva

Rockgrub

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= Other = Bloom Plankton

Bloom Plankton

Skyray

Warper

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Trivia

 * The Stalker and Lava Lizard are the only two 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.