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How can you tell if platys are pregnant? Just wondering if there are any signs other than rounding/protruding tummies, like the stomach turning darker or anything like that.

Also curious how to tell the sex of platys, if there is any way.
 

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Sexing them is very easy. The females have a fan shaped fin on their bellies and the males have more of a spikey fin called a gonopodium.

When females are far along there's no mistaking the belly. They also develop a dark spot by their anal fin. This can be hard to see depending on the color of your fish.
 

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Wow that is simple, eh? I already know right now that my red is a male and my marble is a female. Thanks! haha

Although the one I thought may be pregnant is actually a male...so...that answers that question too haha
 
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