What fish in aquarium can breed on their own without our intervention?

[Pyluper]

I know this isn't about monster fish, but what fish can breed by themselves without our help? Regarding the size. By this I meant no heater, no nothing, just only great filtration, large enough space and decorate the tank enough that the fish are comfortable.

I know there will be convict cichlids, guppies, endlers, mollies, platies, mbuna, kribs and other than that?

 

[Ansorgii]

You live in Thailand, so I will asume you don't really need any heater anyways. Given good water, food and sufficient space and decoration, I will guess nearly every tropical fish that doesn't migrate, like RTCs, or is highly specific will breed if their tank mimics their natural habitat.

 

[Deadeye]

Not really a monster, but goldfish will breed readily in many tanks.

 

[Ansorgii]

If you want to try to breed tetras, Lemon tetras are a great beginners choice, give them a dark place with lots of cover, and soft water and you will have many minis in no time.

 

[Pyluper]

Not really a monster, but goldfish will breed readily in many tanks.

What kind of goldfish? Or just any goldfish in general?

 

[Redshark1]

My Boseman's Rainbowfish bred continuously in my six-foot tank and some fry got streetwise (avoided predation) and made it to adulthood.

 

[Deadeye]

What kind of goldfish? Or just any goldfish in general?

They’re all the same species - just different breeds (just like dogs). Any goldfish will (theoretically) mate with each other.

 

[TwoHedWlf]

I know this isn't about monster fish, but what fish can breed by themselves without our help? Regarding the size. By this I meant no heater, no nothing, just only great filtration, large enough space and decorate the tank enough that the fish are comfortable.

I know there will be convict cichlids, guppies, endlers, mollies, platies, mbuna, kribs and other than that?

Guppies, platies, kribs, shellies, goldfish, bristlenose, cories, jewels, keyholes, apistos, pearl gourmis, honey gourimis, kissing gouramis, severums...Basically decent sized tank with a lot of cover and good water conditions most fish will breed without any help.

 

[duanes]

Most fish don´t need any help from us other than clean water ,
and the right water type they have evolved over millenia to live in.

In my tanks over 50 species of cichlids have bred, half dozen live bearers, a few tetras, and 2 Anabantids.

Because I have hard, high pH water, all I have to do is hold nitrates below 5 ppm, and Central Americans, Rift Lake Africans and a smattering of other species breed given enough space, and uncrowded conditions (I usually keep only 1 mated pair per tank)






But, because I don´t have soft, low pH waters, I don´t expect or even bother keeping those type fish.