New platy fry owner - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 10-20-2012, 07:39 PM Thread Starter
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New platy fry owner

Hello, one of my females gave birth about a week and a half ago, and I have some questions. We caught 15 fry. We have been feeding them crushed flakes and crushed baby shrimp.

When will I be able to tell the gender of the fry?

How do platys breed? If I separate the fry using a divider, is it still possible for them to have babies when they are old enough?

They are currently being floated in the main tank in a 1g (all we have empty is the Betta hospital), when will it be necessary to move them?

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post #2 of 4 Old 10-21-2012, 10:53 AM
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Platy mature in about 3-4 months. Though I believe that you should be able to tell the genders apart at about 6 weeks or so. But every fish grows at different rates so you might have to wait longer. I was able to sex my guppy fry at about 3 weeks.

As far as breeding goes, If you separate the babies, as long as the females are by them selves (meaning no males in the tank/side with them) they would be unable to breed. They need to have physical contact to be able to breed.
As a side note though, platy (like other livebearers such as mollies and guppies) they can store sperm. so from one mating, they can about 5-6 batches of babies afterwards.
I would suggest keeping them in the 1 gallon for at least another month. just keep an eye out. Basically whenever the babies look like they are twice as big as anything that can fit in the adults mouth. then you can put them into the tank with the adults. just be ready to take them out if the adults try to eat them.
Hope I was able to help.

happy owner of a wild type GFP axolotl named Percival and a bearded dragon named Deucalion.
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post #3 of 4 Old 10-26-2012, 08:24 AM
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Some say that platys can change sex, but that may just be a delay in sexual maturity.

I just had this happen with some fry (not really fry anymore, at 6 months) dalmation mollies. I have 5, and there only appeared to be 1 male, as he was much smaller than the rest and had a gonapodium, while the suspected females had a typical fanned anal fin. In the past month, though, 2 more of the 5 have had their anal fin replaced by a gonapodium. Now the 2 larger ones posture at eachother, and the 3 males harrass the 2 females. So much for keeping the 2:1 female to male ratio.

TL;DR: Your female platys might later grow into males.
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post #4 of 4 Old 10-26-2012, 09:53 AM
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I have heard of that happening. But sounds as if its just delayed sexual maturity. So I guess thats something to watch for as we'll. as long as the male doesn't have a genopodium he would be unable to impregnate any of the females. So if you wanted to keep the females pure that just means checking every so often.
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