No. Bladderfish do not lay eggs in Subnautica’s Alien Containment. Put at least two Bladderfish in a containment unit and, with enough room and time, they reproduce by producing another Bladderfish—not an egg.
How Bladderfish reproduce in Alien Containment
Alien Containment distinguishes between creatures that lay eggs and small fish that reproduce by producing another fish. Bladderfish are listed among the fauna players can breed there, but they do not produce Bladderfish eggs. The community Alien Containment reference describes the breeding mechanic; the Bladderfish reference identifies the species.
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How to breed Bladderfish
- Build an Alien Containment and place at least two Bladderfish in it.
- Leave room in the containment for the population to grow.
- Allow game time to pass. The fish can produce another Bladderfish; no reliable real-time wait estimate is established.
Why the PDA’s Alien Eggs entry can be confusing
The PDA entry titled “Alien Eggs” says that many local species may reproduce by laying eggs. That is general in-world information, not a species-specific statement about Bladderfish. It does not establish that Bladderfish lay eggs; the Alien Containment’s species-specific behavior is the relevant distinction here. See the PDA databank transcription.
What is established about this mechanic
The cited species and containment references are community wiki pages, not developer documentation. The PDA transcription page reports a refresh date of 2026-05-18, but its general Alien Eggs entry does not name Bladderfish. These sources support the practical distinction between egg-laying species and Bladderfish reproduction, but do not provide a version-specific developer confirmation.
Quick Recap
Best Value
- Dive into a vast underwater world - sub Nautica's ocean range from shallow coral reefs to treacherous deep-sea trenches, lava fields, and bio-luminescent underwater rivers
- Scavenge, craft, and survive - after crash landing in your life pod, the clock is ticking to find water, food, and to develop equipment needed to explore as you collect resources from the ocean
- Construct underwater habitats - build Bases on the sea Floor, choosing layouts and components, and managing hull-integrity as depth and pressure Increase
- Unravel the mystery - signs abound that something is not right and you must Figure out what happened to this planet and what caused you to crash - can you find a way to make it Off the planet alive
- Disrupt the food Chain - lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators
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Rank #3
- Dive into a vast underwater world - sub Nautica's ocean range from shallow coral reefs to treacherous deep-sea trenches, lava fields, and bio-luminescent underwater rivers
- Scavenge, craft, and survive - after crash landing in your life pod, the clock is ticking to find water, food, and to develop equipment needed to explore as you collect resources from the ocean
- Construct underwater habitats - build Bases on the sea Floor, choosing layouts and components, and managing hull-integrity as depth and pressure Increase
- Unravel the mystery - signs abound that something is not right and you must Figure out what happened to this planet and what caused you to crash - can you find a way to make it Off the planet alive
- Disrupt the food Chain - lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators
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- Survival is key: gather valuable materials, craft tools, manage your hunger and thirst, all while evading the dangerous wildlife that sees you as its next meal
- the mysteries submerged on planet 4546b: you came here in search of answers. You risked everything to get here and you will not leave until you have uncovered the truth…
- exploration: Delve into unique Aquatic and terrain biomes that will unlock not only materials, but the answers that you seek
- build your habitat: crafting and building the comforts of home here. These bases will be integral for your survival from not only the wildlife, but also the harsh environment around you
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