Features of the Guppy's Body

Because guppies move quickly, they are a little difficult to observe.

Yes, they are, so I’ll explain what they look like. If you knew some characteristics about their body, you could observe them easily.

You can distinguish a male from a female when a guppy is more than three weeks old. Males are characterized by having a buttocks fin, females are characterized by having a lower belly. The buttocks fin grows behind its sex organ, gonopojiumu, and becomes sharp. If that characteristic appears, he is male. If black spots appear on the lower belly, under the air bladder, it is a female.

I understand very well. Thank you!