Thinking about livebearers

I've never had livebearers mostly because I didn't know what to do with their young. So I thought if I could get all males that would work. Can most livebearers be sexed at the store? (eg swordtails, platys, guppies, ect)

 

At my petco I think they separate males and females so they don't breed, I would just buy 2 tanks and just get fish, bring them home then sex them and have a tank for male and female, then one day if you want to breed them you won't have to buy females

 

Yes their usually at the size and age that you can usually sex them at the store. Guppy sexes are usually kept separate, mature male swordtails will usually have a sword, on top of that search gonopodium under google pics so you can sex every thing else.

 

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The common species can be prolific but there are also livebearers that aren't that prolific.
But to answer your question if such fish can be sexed at an lfs, if they're adults, they're easier to sex. Depending on the livebearer species, you can sex them even earlier.