Sexing Platys: Randy Proves He’s a Boy

Randy, my one male Platy is so happy with his three female companions. The pic shows how easy it is to tell that he is male (all livebearers exhibit sexual dimorphism, i.e. external physical signs of being male or female). Look at that gonopodium!* I’ve seen Randy waving this around when he’s chasing one of his ladies. Bendy!

*The gonopodium is a modified anal fin which is used to fertilize eggs. In the male the anal fin is rod shaped, while the female has a traditional fan shaped anal fin. That’s fish-fact!!!


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