(QUICK AWARNING, the icon used in this post is not my work. If i could find the original artwork, i would be happy to credit him.)
 
This guide will help you find the locations of all aliens in the game, as well as recommend kill strategies and catching strategies.
 
 
SPOILER WARNINGS
 
 

Safe Shallows

 
 
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Bladderfish, Peeper, Garryfish, Boomerang, Holefish These fish are not meant to hurt or move you. They are there to be visual entities, key elements to the story, or to provide sustenance.
 
 
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Catching: Keep swimming for any of these fish. You should eventually be able grab it when you are within range.
 
 
Killing: Just a few swipes of the knife should do it.
 
 
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Gasopod This entity could potentially kill you. If you get too close to this entity, it releases toxins that explode within a short time.
 
 

 
 
Killing – Keep hitting it with your knife to dodge its toxic balls. It will eventually die if you keep at it.
 
 
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Rabbit Ray : This entity is only visually appealing and doesn't have any use other than to occasionally glitch into the base and fly around.
 
 

 
 
Killing : Keep hitting it with the knife.
 
 
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Crashfish: An explosive fish. These fish can be dangerous and can even catch (, including me), off guard. They hide in small sulfur plants within coves and will charge if they see a player.
 
 

 
 
Killing – It is futile to kill a crashfish. They will explode after chasing you for a few seconds in an attempt to harm you. Instead, you should swim as fast as possible.
 
 
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Shuttlebug is purely visual and is only there as an additional entity.
 
 

 
 
Killing: Killing shuttlebugs is futile because they do not harm you or get in the way.
 
 
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Skyray Skyrays are the alien-like bird-like creatures that you see when you exit your life pod. They can only be seen and, in most cases, cannot be killed without a propulsion gun.
 
 

 
 
Killing: Skyrays are harmless and do not harm you.
 
 
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Shoal of Fish: These are the only things you can do, other than to look at them.
 
 
 

Kelp Forest

 
 
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Peeper, Boomerang Hoopfish, Eyeye : These fish are only there for their sustenance.
 
 
Catching: Keep swimming for one. It should be easy to catch it.
 
 
Killing: Just a few swipes will do the trick.
 
 
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Hoverfish – These fish are only there for sustenance. BUT, MANY PEOPLE WORSHIP THEM DURING THEIR TERRITORY! !
 
 

 
 
Catching: Keep swimming after it. It should be easy to catch it.
 
 

 
 
Killing: Just a few swipes will do the trick.
 
 
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Stalker is a shark-like alien that can bite you. They can steal small pieces of metal, including cameras, and are quite annoying. They can also drop their fangs which are extremely valuable.
 
 

 
 
Killing: Keep looking at it. You might get bit a few times, but don't panic.
 
 
 

Grassy Plateaus

 
 
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Biter: A small, solitary fish that eats everything it comes across.
 
 

 
 
Killing: Just a few swipes of the knife should do it.
 
 
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Floater is a small grabbable alien that can't hurt anyone. It makes the object it is attached to more bouyant.
 
 

 
 
Catching: It doesn't matter if you chase it; you can grab it.
 
 
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Spadefish, Reginald – These fish are only there for sustenance.
 
 
Catching : Follow one for a while, you will eventually be able to spot it.
 
 
Killing: Just a few swipes of the knife should do it.
 
 
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Reefback Leviathan : A huge creature that makes whale-like sounds as it passes by. It is one of few passive leviathans available in the game.
 
 

 
 
Killing : Keep hitting it with a weapon or prawn suit. However, I'm not sure if they can be killed.
 
 
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Sand Shark – Flailing, quick, and disfigured beasts that can burrow beneath the sand.
 
 

 
 
Killing – Keep at it with your knife, but don't get bit.
 
 
 

Bulb Zone and Mushroom Forest

 
 
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Jellyray: A beautiful, yet strange creature that swims through trees. It is one of few large, yet passive creatures.
 
 

 
 
Killing : Keep hitting it with the knife.
 
 
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Mesmer is a small, aggressive creature. It can hypnotize you.
 
 

 
 
Killing : You can either keep hitting it with a knife or grab a propulsion gun and shoot it against the wall.
 
 
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Ampeel: An electric eel. It can zap any object that touches or gets too close to it and is territorial.
 
 

 
 
Killing : You can use a prawn suit to it.
 
 
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Boneshark is a calmer, but still terrifying, variant of the sand-shark. If it sees you, it may chase you.
 
 
Killing : You can use a prawn suit to it.
 
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Dunes and Sparse Reef

 
 
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Cave Crawler – Small, annoying spiders. They cause damage.
 
 
Killing : Use a propulsion gun to shoot it against a wall or continue hitting it with a knife.
 
 
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Rockgrub: Only visual, tiny green bugs
 
 
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Warper is an artificial being created by precursors. It can teleport, warp and move around in places and even teleport you.
 
 
Killing: You can use a prawn suit to go with it
 
 
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Bleeder : Small aliens that latch onto your arms.
 
 
Killing : Keep hitting it with the knife.
 
 
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Reaper Leviathan – One of the most terrifying and eerie creatures in the game.
 
 
Killing: I recommend a prawn costume with a grapple arm, a torpedo arm, or a handarm. Keep shooting/punching the reaper by latching onto it. If it's squirming, it's just hurt animation.
 
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Grand Reef and Sea Treader's Path

 
 
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Crabsquid is a terrifying monstrosity that sometimes releases green electricity that shuts down electrical devices such as tools and habitats.
 
 
Killing – Use seamoth or prawn suits torpedoes.
 
 
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Juvenile Ghost Leviathan is one of the most aggressive leviathans in this game. They will attack everything they see.
 
 
Killing : Use torpedoes and prawn arms.
 
 
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Sea Treader Leviathan Large neutralist leviathans who walk on the ground but cannot jump or swim.
 
 
Killing – It is quite pointless to kill sea treaders as their feces They can be a source of useful information. They are not aggressive and will not attack you unless they get too close to you or attack you.
 
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Caves of Jellyshrooms

 
 
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Crabsnake – Long eels that can hide in large mushrooms. If they are found hiding in a mushroom that the player is swimming over, they will grab the player.
 
 
Killing : Use a prawn suit.
 
 
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Oculus is a variant of peeper. They are passive.
 
 
Catching : Keep swimming after it. You should be able catch it soon.
 
 
Killing: Just a few swipes of the knife should do it.
 
 
 

Caves of Blood Kelp

 
 
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Blighter is a creepier version of the biter.
 
 
Killing : Keep hitting it with the knife.
 
 
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Blood Crawler is a tall, slim and creepy version of the cave crawler. These things made me nightmare once.)
 
 
Killing : You can use a prawn suit on it or a propulsion cannon.
 
 
 

Lost River

 
 
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Spinefish – Skeleton versions for hoopfish.
 
 
Catching : Keep swimming after one, and you should be able eventually to catch it.
 
 
Killing: Just a few swipes of the knife should do it.
 
 
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Ghost Ray is a translucent, bioluminescent version the crimson-ray. It is passive.
 
 
Killing – Ghost rays are not dangerous and will not attack you.
 
 
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Amoeboid is a decorative blue organism that can be found on floors and walls.
 
 
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River Prowler is a skeletal version the ampeel. It is not likely to shock you, but it can be lethal.
 
 
Killing – Try using prawn suits or seamoth torpedoes.
 
 
 

Lava Lakes and Inactive Lava Zone

 
 
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Magmarang and Red Eyeye : Volcanic variations of the boomerang or eyeye. They behave exactly like their normal counterparts.
 
 
Catching : Keep swimming after one, and eventually you will be able to catch them.
 
 
Killing: Just a few swipes of the knife should do it.
 
 
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Crimson Ray Volcanic version the ghost ray. It is passive.
 
 
Killing – Crimson rays are not dangerous and will not attack you.
 
 
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Lava Larva – Highly annoying creatures that latch onto your cyclops. This can cause damage to the cyclops.
 
 
Killing – You can't kill them naturally, but you can grab their cyclops.
 
 
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Lava Lizard – Aquatic lizards can have magma buildup on the backs. They will spit lava at your face.
 
 
Killing : You can use a prawn suit to it.
 
 
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Sea Dragon Leviathan is one of the most powerful and large creatures in the game. It can throw your vehicles against walls and spit lava, as well as emit terrifying roars. Sometimes they can even get stuck in the terrain. They are limited to 3 in total.
 
 
Killing – It is strongly recommended that you stay away from these beasts. If you really want to kill them, however, you will need to bring a few prawn suits, your seamoth, and your cyclops. You should also bring a reinforced diving suit and a thermoblade. You might even try shooting things at it with your propellant cannon.
 
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Other Creatures

Adult Ghost Leviathan is one of the largest creatures in this game. They are extremely lethal and the only leviathans known to be capable of respawning after death.
 
 

 
 
Killing – Killing an adult ghost Leviathan is futile, as they can respawn.
 
 

 
 
Habitat Crater Edge (A blank space of pure darkness beyond the map's edge.), Grand Reef. Northern Blood Kelp Zone
 
 
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Sea Emperor Leviathan is a crucial creature in the subnautica storyline. It is the largest creature in the game.
 
 

 
 
Killing : It is impossible for you to kill the sea emperor.
 
 

 
 
Habitat: Precursor Aquarium
 
 
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Cuddlefish : These creatures look similar to water dogs. You can play with them as they are very expressive. You can play with them in many ways, including Riley performing a magic trick with treats and Riley giving a high-five to the cuddlefish.
 
 

 
 
Killing: Killing cuddlefishes is a sign that you are a monster.
 
 

 
 
Habitat Cuddlefish don't have a habitat. Cuddlefish eggs can be found in caves and abandoned structures. (Eg : One of the giant mushrooms trees.)

 
 

 
 
I hope you enjoy the Guide we share about Subnautica – All Alien Location & Strategy; if you think we forget to add or we should add more information, please let us know via commenting below! See you soon!