Male or female

[country_girl]

Quick question I have a twinbar platy and I thought it was a male but he seems to be getting larger in the belly but he might just be eating more then my other ones do you think its a male or female?

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[Gillie]

It's a male, you can tell by the modified anal fin(gonopodium)

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[Mattfinn]

Look at the anal fin it should be curved if female and pointed if male