Alien containment built in your base, place 2 of the same species in and they will breed.

Bonus, if you release them in to the wild they will pretty much hang out where you leave them and not attack you.

Great way to collect Stalker teeth.

You can’t make hybrids, but you can put them in an alien containment to get more of them.

You need the large fish tank (Alien containment something) and put 2 fish of the same species in it.

After a while they will multiply to a maximum of 12 (or more?)

If there are fish of different species, they will reproduce up to a certain maximum number of fish. However, they always remain a single species.

I don't know if this will work with the small aquarium, but it might.

Mmm, peppered bladderfish.

"There's no bladderfish in here. So you wouldn't really call it peppers and bladderfish, now would you?"

"Yes, I would."

"Well, It's not!"

tips here

https://forums.unknownworlds.com/discussion/147777/fish-efficiency-a-guide-to-choosing-what-to-put-in-aquariums-now-with-egg-laying-creatures

put them in the ACU and they reproduce on their own

Well, when a Mommy peeper and a Daddy peeper love each other very much, they...

i meant acu.. sorry..

If placed in an alien containment module, any fauna of the same breed will breed naturally. The time it takes for fauna to breed is independent based on the type of fauna you would like to breed, but luckily for you crashfish breed quite quickly! I am not a bot, but rather a second account made by u/Arashio7. Was this comment helpful? If so, upvote this comment. If not, downvote this comment.

Hi there! We don't have breeding available in game yet 🙂 it's definitely on the to-do list! Right now, we're working on the chemistry update, which you can learn more about here: Chemistry Update Video

Thanks for playing the game!

The alien containment can only hold a certain amount of fish. If you put two of one type of fish in there, overtime they will 'breeds by populating the tank with miniature versions. After awhile they will grow big enough you can collect them. The more containment chambers you have stacked, the more fish it can hold.

1. Build an alien containment

2. Put two of the same species of fish in it

3. Wait

Mods can but in vanilla no

Yes. But you'll need build an alien containment tank to do that, the aquarium won't work.

Typical reddit user behavior. Rather would ask other people instead of asking a database a question.

Couldn't you just ignore his post? Seriously I don't get all the hate over people asking questions on reddit (or elsewhere). Some people like to do independent research others like to ask questions, its a personality thing.

Wouldn't that be easier

Yes

FYI not all fish will breed. If you can eat it, it will probably breed once you have two in there. Crabsquids definitely breed.

You are limited to 10 /per containment unit/ so if you stack em the skies the limit.

Have you tried low lighting, some Barry White and too much cheap fizzy wine?

Seriously though, as long as you've got less than 9 in a tank they'll breed by themselves. Except cuddlefish.

Im pretty sure you just need 2 of the same fish

2 of the same fish, less than 10 (I believe) total fish in alien containment. Wait a bit and at some point there should be an egg ����

You need to feed them the souls of a reaper leviathan

If there are two or more of the same species and enough space they will breed

Put them in the big alien containment. You keep them in containment for decoration or sustenance.

And the food you have to feed the fish to breed them comes from an alien planet?! What are they eating on Nauvis and why can't I use that?

The fish breeding recipe takes 6 ingame seconds. Since an ingame day is 420 seconds, that means the fish breeding recipe takes approximately half an hour to breed new fish.

That sure sounds like some pretty advanced technology. That's not "throwing some fish in a tank, feeding them, and seeing what happens", that's some advanced bioengineering right there.

Because your engineer degree didn't cover how to make alien fish food.

Someone never watched Star Trek.

Every trekkie knows to breed sea life you need...

Transparent Aluminium, Space Flight and Time Travel in that order.

As meatloaf put it two out of theee ain't bad

Ahhh great research! I did wonder about those things.

Are you totally sure about the no breeding with parents? I'm sure I only have tanks of three fish where I'm always selling off the weaker parent, and not encountering any trouble.... that's what I thought anyway.

I have many aquariums stocked with only pristine fish, but they still on occasion produce offspring of merely epic quality, so there seems to be a small chance of a 1 rank offset from the parental stock.

If you have two pristine parents, you’ll get a pristine offspring most of the time but you can get a lower rarity one once in a while.

I had an egg cup with the opening right up against the back of the tank and no whales. After turning it around I got some whales. Those developers sure pay attention to little details! I also like the detail of the baby whales being so little. They seem to grow rapidly though. And just like real life, goldfish filth up their tank rapidly.

They can breed with a parent, I’ve had this happen many times with the nigiri fish because I’ll sell off the one with fussier buzz bonuses. I also had a tank of all pristine fish turn out a few great fish, it’s rare but it happens.