Subnautica 2 Fauna — Full List

Animal life of Proteus — passive to leviathan-adjacent.

Biome

Depth

Danger

48 total

Veps Sensor / Armored Fish / Aster Scyllid / Crab Teratoma / Garden of Mimics / Lamp Shootroot / Peacock Raion / Flagon Spraion / Tripe-bowl Raion / False Fission Drum / Unknown Living Structure / Wort Wort / Apocalypse Sponge / Aeroshell Sponge / Copper

Water Slug

Waxmoon

Name	Depth	Danger	Biomes	Description
Acid Raion		0	Shallows Passive	The Acid Raion (Raion carbonica) is a colony organism — thousands of tiny worms sharing a single sponge-like membrane — that uses weak acid secretions to digest food. Passive in behavior but not passive in defense: disturbing the side pouches triggers a toxic fume response. The correct harvest technique is to remove the side pouches with the Survival Multitool first, then pick the central Medical Gel Sac safely. Found in the Shallows, notably in the cave directly beneath the starting Lifepod.
Awnworm		0	Graveyard	The Awnworm (Ventworm awn, "grain-husk vent worm") is a sessile plume worm that colonizes hydrothermal vents in the Graveyard biome. It survives near-boiling water and actively harvests hydrogen sulfide and minerals from vent emissions — an extremophile adapted to conditions lethal to most marine life. Passive and non-threatening, it is a visually distinctive creature that fills the biological niche of real-world tube worms.
BFJ		0	Plateaus	The BFJ ("Big F-ing Jelly", Dactylbrachia gigas, "great finger-armed jelly") is a massive passive jelly with no direct Earth analog — its finger-like tentacle-legs set it apart from conventional jellyfish morphology. Despite its imposing size, the BFJ is completely passive and presents no threat. Found on the Plateaus biome, it is more of a spectacle than a hazard — one of the game's memorable gentle giants.
Black Hoverthorn		0	Root Canyon Passive Variant Of Hoverthorn Subnautica2hub Returns 404, Data Via Game8	Variant of Hoverthorn (Monopter astrapakantha). Black morph adapted to deeper, darker waters — the deep-Karakorum equivalent of the standard Hoverthorn.
Bloom Parasite		1	Blighted Coral	The Bloom Parasite is a mobile parasitic organism associated with the Bloom — the Proteavirus beta infection spreading through Proteus's biomes via Bloom Canker nodes. It infects other fauna (notably Epicureans) making them significantly more aggressive and dangerous. The Bloom Parasite itself is catalogued on the official wiki as a mobile organism. Biome data indicates association with Blighted Coral zones. Detailed PDA entry not yet fully documented in EA 1.0.
Bluemoon		0	Shallows Passive Fish	Passive Shallows fish with a blue-moon coloration. Databank entry pending in EA 1.0 — visually common but textually undocumented.
Bullethead	100–500 m	3	Observatory Ruins	The Bullethead (Panopliateuthis velos, "armored fast squid") is a pack-hunting cephalopod found in the Observatory Ruins at 100–500m depth. Individually durable (1,000 HP) despite their small size, Bulletheads attack in coordinated groups and are disproportionately dangerous for their appearance. They are the scan target for the Camouflage biomod — worth the risk of bioscanning them in their home biome.
Cerathecan	50–250 m	4	Observatory	The Cerathecan (Exile cerathecan) is an upright, double-valved shell creature that ambushes prey with a devastating bite. Found in the Observatory biome at 50–250m depth, it is one of the most dangerous creatures in that zone — its single bite deals 100 damage, one of the highest single-hit attacks in the game. Approach any area with shells standing vertically at attention with extreme caution, especially before you have Strike Armor installed.
Coral Crab	0–50 m	0	Coral Gardens Shallows Depth 0 50 M Hp 1000 Aggressive	Refrigerator-sized armored crustacean of the Shallows. Aggressive on sight despite the danger=0 rating in the database — it deals modest damage but takes forever to kill (HP 1000) and its scan duration is 6 seconds, one of the longest in the game. Bioscanning it unlocks the Water Retention biomod (x2 water from all sources), which makes the patience worth it. Approach from behind with Camouflage, hold the Scanner steady, watch your air bar.
Dangling Salp		0	Plateaus	The Dangling Salp (Salp pendulous) is a sticky suspension-feeding tunicatecreature that hangs in the water column and captures passing organisms from the current. Found on the Plateaus, it is passive toward Pioneers. As a tunic organism (related to real-world sea squirts and salps), it is part of the diverse colonial organism ecology of Proteus alongside the Dangling Salp's relatives in the Rotsac and Tunic groupings.
Dark Anemone Crab		0		Dark-morph crab fauna associated with anemone clusters in the Anemone Hills biome. A regional variant of the more common Coral Crab body plan, distinguished by darker pigmentation and anemone-symbiotic behavior.
Electric Geordie	150–500 m	2	Root Canyon, Observatory	The Electric Geordie (Salpapod geordiwangi) is a deep-water variant of the Geordie that has evolved a strong attraction to electrical current — making it a major threat to base power infrastructure. It will actively seek out and disrupt powered equipment or cables connected to your base. Found in Root Canyon and Observatory at 150–500m depth. Bioscanning it (with Bioscanner) combined with the Sandspear unlocks the Bioluminescence passive biomod, and it also contributes to the Electric Discharge active biomod.
Epicurean	350–500 m	3	Root Canyon	The Epicurean (Postpanoplia epicurean, "armored creature that likes everything") is a deep-water omnivore lurking at 350–500m in Root Canyon. With 1,000 HP, a primary bite of 30 damage, and a secondary attack doing 10 damage, it is a sustained-damage threat rather than a burst attacker. Notably, Epicureans become significantly more dangerous when parasitized by the Bloom — a parasitized specimen exhibits erratic, more aggressive behavior and should be avoided outright.
Flash Slug		0	Observatory Passive Water Slug	Seaslug kleptopharos — "stolen-beacon slug". Luminescent free-swimming relative of the Water Slug. Chimeric traits.
Fluttertail		0	Coral Gardens	The Fluttertail is a small passive fish found in the Coral Gardens biome. It is described as a foundation of the local food chain — one of the smallest prey organisms that larger carnivores like the Marrowbreach and Nibbler Mango depend on. Completely harmless to Pioneers. Its distinctive flutter-swimming motion makes it easy to identify. Scan it early for the PDA entry; no risk involved.
Foureye	0–100 m	2	Shallows	The Foureye (Morokotoform duplex, "fused-form double") is a biological curiosity — two fish born as identical twins and fused belly-to-belly, sharing both digestive and nervous systems. The resulting creature swims with two sets of eyes watching in opposite directions simultaneously, making it nearly impossible to sneak up on. Found in the Shallows at 0–100m depth as an aggressive carnivore. Despite the bizarre appearance it is one of the earliest hostile creatures most players will encounter.
Fridge Worm		0	Graveyard	The Fridge Worm (Ventworm cryocthonian, "vent worm that brings cold from below") is the cold-end counterpart to the Awnworm — a sessile plume worm that thrives near cold-water upwellings and cold seeps rather than hot vents. The name references its adaptation to bring cold from depth up into shallower areas. Found in the Graveyard biome, passive and harmless. Like the Awnworm, it is a deep-seafloor extremophile with no terrestrial analog.
Geordie	0–100 m	0	Shallows	The Geordie (Salpapod geordie) is a jet-propelled omnivore that evolved from a bony octopus-like ancestor, combining a salpapod's tunic body plan with cephalopod locomotion. Found in the Shallows at 0–100m, it is defensive — will not attack unprovoked but will respond if cornered. The shallow-water cousin of the Electric Geordie, it lacks the electrical adaptation. A good early bioscan target given its abundance and passive nature.
Halfmoon	0–400 m	0	Coral Gardens, Observatory Ruins	The Halfmoon (Moliform luna, "moon-shaped soft form") is a dual-valve plankton strainer found across Coral Gardens and Observatory Ruins at 0–400m depth. A defensive forage fish, it is a key part of the food chain — cooked Halfmoon provides +15 food (mild dehydration cost: -5 hydration). Also used for Grease production (Processor: 2 Halfmoon → 1 Grease). One of the most useful passive creatures for sustaining the Pioneer during long expeditions.
Hammerhead	0–50 m	3	Shallows	The Hammerhead (Panoplia hammerhead, "armored hammerhead") is a 1,000 HP armored herbivore that paradoxically behaves aggressively, ramming and biting anything that enters its territory. Found in the Shallows at 0–50m depth, it herds with other Hammerheads and is a significant early-game threat. Primary attacks combine a 15-damage ram with a 15-damage bite. Bioscanning the Hammerhead unlocks the Homing Sense passive biomod (HUD ping near powered bases).
Harvestmoon		0	Shallows Passive Fish	Passive Shallows fish, named for its harvest-moon orange-red coloration. Common low-tier food source and one of the first fish most players catch on day one.
Houndgar		2	Graveyard	The Houndgar (Teuthis courser, "running squid") is a cephalopod from the Graveyard biome that uses a disorienting dazzle attack to blind prey before a Marrowbreach moves in for the kill. The Houndgar and Marrowbreach are a co-evolutionary predator pair — treat any Houndgar sighting as an advance warning that a Marrowbreach is operating nearby. Bioscanning both creatures eventually unlocks the Chum Cloud active biomod (requires Toxic Sponge scan too).
Hoverthorn	100–500 m	0	Observatory	The Hoverthorn (Monopter astrapakantha, "single-winged lightning-spine") is a passive fish found in the Observatory biome at 100–500m depth. It propels itself using a living magnetohydrodynamic thruster — a biological analogue to the MHD drives used in sci-fi submarines — rather than conventional fins. Passive and non-threatening, but critical: bioscanning the Hoverthorn (with Bioscanner) unlocks the Threat Sense passive biomod, which provides a 50m radius hostile detection ping.
Hycean		0	Shallows Passive Jelly	Hycean hycean — flying predator-style jelly. Named for hydrogen-sky water-ocean ("hycean") worlds.
Jelly Lei		0	Plateaus	The Jelly Lei (Anthobrachia hebesoros, "flower-armed dull bloom") represents a reproductive or colonial stage of a flower-shaped jelly. Found on the Plateaus, it has a loose association with Necrolei colony structures and the Jelly Lei landmark POI. Passive and harmless. Related to the [necrolei] organism — both share the Anthobrachia genus.
Jelly Ring		0	Graveyard	The Jelly Ring (Thermodont sufganiyah, "heat-eating jelly donut") is a passive jelly that feeds on hydrothermal vent flux in the Graveyard biome. Its ring-shaped body — inspiring the "donut" in the name — gives it a unique silhouette. Like other vent-associated organisms, it is found near the same hot vent structures as the Awnworm, Gold deposits, and Sulfur nodes, making the Graveyard a rich multi-resource biome once Heat Tolerance Adaptation is active.
Jetocaris	50–350 m	0	Observatory, Power Plant	The Jetocaris (Tripod phrontiscaris, "three-footed thoughtful shrimp") is a large passive crustacean with an unusual distinction: it has the lowest HP among the large creatures in the game — only 100 HP. It poses absolutely no threat, making it one of the safest large creatures to scan and observe. Found in Observatory and Power Plant biomes at 50–350m, it is noteworthy mainly as an easy scanning target in an otherwise hazardous mid-game zone.
Marrowbreach	0–100 m	4	Coral Gardens, Shallows	The Marrowbreach (Mango marrowbreach) is a sharklike apex predator patrolling the Coral Gardens and Shallows at 0–100m depth. At 1,000 HP with variable damage per hit (2–40 damage), it is the most serious sustained predator threat in the starter biomes. A larger, more dangerous variant — the Man-Eating Marrowbreach — also exists in the game data. The Marrowbreach works in tandem with the Houndgar, which blinds prey for the Marrowbreach to ambush.
Microshrimp		0		Tiny arthropod fauna. Sub-2cm body plan. Listed on the official wiki under Mobile / arthropods; stub-level data on third-party trackers.
Mirror Halfmoon		0		Variant of Halfmoon. Mirror-surfaced morph with reflective scale geometry — the scales catch and refract surrounding light, creating a brief 'flash' when the fish turns.
Necrolei		0	Anemone Hills	The Necrolei (Anthobrachia necrolei, "flower-armed death-leech") is a clonal stalk-jelly that remains permanently moored to the seafloor — similar to a stauromedusa in structure. Each stalk is a clonal individual in a larger colony. Found in the Anemone Hills biome, the Necrolei is passive and non-threatening, but its colony structures drop Necrolei Cysts — the renewable ingredient for Strong Acid (2 Cysts → 1 Strong Acid in the Processor), making the Anemone Hills a key resource biome.
Needler Mango	150–300 m	3	Observatory	The Needler Mango is an aggressive carnivore lurking in the Observatory biome at 150–300m depth. With 1,000 HP, it guards the Needler Nest area where Creature Enamel and Conduit Crystals are found — making unavoidable encounters likely for any player progressing through that zone. Bioscanning it (with Bioscanner) in the late-game deep trenches unlocks the Dermal Garden passive biomod (+5 food every 3.5 minutes, effectively halving hunger decay).
Nibbler Mango	0–100 m	1	Coral Gardens, Shallows	The Nibbler Mango (Mango tructa, "trout-like mango") is a small aggressive omnivore in the Coral Gardens and Shallows. At only 100 HP and 5 damage per bite, an individual Nibbler Mango is a nuisance rather than a danger — but they attack in groups, and the cumulative nibbling adds up quickly. Bioscanning (with Bioscanner) near the Angel Comb POI in the late-game unlocks the Slow Metabolism passive biomod (-42% food consumption rate — among the most powerful passive utility biomods).
Pelagic Ghost		0	Tbd Passive	Open-water passive fauna. Pelagic — lives in the water column rather than on the substrate. Distinguished from benthic fauna by its mid-water swimming behavior.
Periscopic Clowncrab		0	Shallows	The Periscopic Clowncrab (Ostrakonskelos periskopion, "crab with a periscope") is a defensive crustacean that takes shelter among stinging anemones — using their nematocysts as a natural shield. Found in the Shallows, it waves periscopic eyestalks above the anemone canopy to watch for threats. Passive toward Pioneers unless provoked; the surrounding anemones may cause minor contact damage if the Pioneer swims directly through them.
Pneuma	100–350 m	0	Observatory	The Pneuma is a defensive fish found in the Observatory biome at 100–350m depth. It is non-aggressive toward Pioneers and will only respond defensively if provoked. Its name comes from the Greek word for breath or spirit. Detail PDA data for Pneuma is limited in EA 1.0, but it is a safe scan target in a zone that also contains more dangerous fauna like Bulletheads and Cerathecans — worth scanning while transiting through the Observatory.
Quadrate		0		The Quadrate (Salpapod tetragnatha, "four-jawed salpapod") is a passive carnivorous morphological variant of the Geordie family — sharing its salpapod body plan but with four feeding appendages rather than the Geordie's typical configuration. Biome location is unconfirmed in EA 1.0 research data (listed as TBD). Non-threatening to Pioneers.
Sandspear	0–300 m	3	Shallows	The Sandspear is an aggressive crustacean found in the Shallows at 0–300m depth. With 1,000 HP and a damage range of 15–50 per hit, it is among the most dangerous shallow-water threats. Its name suggests an ambush strategy — likely camouflaged against sandy seafloor. Bioscanning the Sandspear and the Electric Geordie together unlocks the Bioluminescence passive biomod, making it a worthwhile bioscan target for mid-game players.
Stagged Mephit		0	Graveyard	The Stagged Mephit (Mephit ceryneian, "Ceryneian mephit") — also called the HiHat — is a stack of cloned clam-like molluscs adapted to survive in very hot water near hydrothermal vents. The clams are arranged vertically on a central stalk that is actually a symbiotic worm living inside the colony. Each clam is an individual clone of the founding organism. Found in the Graveyard biome near vent structures, passive, and harmless.
Stilt Orb		0	Anemone Hills	The Stilt Orb is a passive jelly found in the Anemone Hills biome. Documentation in EA 1.0 is sparse — the subnautica2hub database has a stub entry and Game8 confirms its existence without detail. The Anemone Hills is also home to the Necrolei, making it a biome worth visiting for [necrolei-cyst] farming regardless. The Stilt Orb appears to be a sessile or slow-moving jelly organism characteristic of the Anemone Hills ecosystem.
Surge Jelly	0–350 m	1	Observatory, Shallows, Power Plant	The Surge Jelly (Staurobrachia capacitor, "capacitor cross-arm jelly") is a true single jelly organism — not a colonial organism like a Portuguese man-o'-war — capable of powerful electric discharge. Found across Observatory, Shallows, and Power Plant biomes at 0–350m depth, it is defensive and will discharge when threatened or bumped. Bioscanning the Surge Jelly (with Bioscanner) + Hammerhead unlocks the Homing Sense passive biomod (HUD ping near powered bases).
Teal Cycloplet		0		Mobile fauna entry on the official wiki — teal-colored cyclops-style organism. Stub-level data on third-party trackers; detail pending EA updates.
Titan Rockbore		0		Titan-class rock-boring fauna. Massive, slow, drills through hard substrate — one of the largest non-Leviathan body plans documented in EA 1.0.
Tongue Thief		3	Root Canyon	The Tongue Thief (Ostrakonskelos glossaklept, "crab that steals the tongue") is a parasitic crab that infests the mouths of larger marine life — causing unremitting hunger in its host by intercepting food before it can be digested. When it targets a Pioneer, it applies a debuff that rapidly drains the food meter. Found in Root Canyon with 1,000 HP and aggressive behavior, it is one of the nastier mid-game encounters.
Twin Sitaray		3	Power Plant, Root Canyon	The Twin Sitaray (Sitaroid gemini, "twin ray") is a dark-sea electropredator that ecological disruption has pushed from its deep preferred habitat up into the Power Plant and Root Canyon zones. Its twin-body structure gives it a distinctive silhouette. Aggressive, with an electric attack mechanic that poses a threat to unshielded Pioneers. Found at depth requiring Tadpole Depth Module Mk.1 to reach safely.
Veps Sensor / Armored Fish / Aster Scyllid / Crab Teratoma / Garden of Mimics / Lamp Shootroot / Peacock Raion / Flagon Spraion / Tripe-bowl Raion / False Fission Drum / Unknown Living Structure / Wort Wort / Apocalypse Sponge / Aeroshell Sponge / Copper	0–500 m	0		Veps Sensor / Armored Fish / Aster Scyllid / Crab Teratoma / Garden of Mimics / Lamp Shootroot / Peacock Raion / Flagon Spraion / Tripe-bowl Raion / False Fission Drum / Unknown Living Structure / Wort Wort / Apocalypse Sponge / Aeroshell Sponge / Copper
Water Slug		0	Shallows	The Water Slug (Seaslug hydroclast, "water-splitting sea slug") is a remarkable defensive mollusc that converts seawater into drinkable fresh water — making it a critical survival resource. Found throughout the Shallows, the Water Slug is the easiest and most accessible water source in early game. Bioscanning it (with the Bioscanner) unlocks the Water Secretion passive biomod (+5 water every 3.5 minutes, stackable in inventory) — described as the easiest passive biomod to obtain in the game.
Waxmoon	0–350 m	2	Shallows	The Waxmoon is an aggressive fish found throughout the Shallows, spanning a surprising depth range of 0–350m across 15+ confirmed spawn sites. Once aggro'd, the Waxmoon pursues relentlessly — unlike many fish that give up after a short chase. Escape requires either superior speed (Wakemaker) or environmental cover (ducking into a cave or tight wreck structure). Its wide distribution makes it one of the most frequently-encountered threats in the early game.