How To Tell If A Black Mollie Is Preggy?

[levic991]

How can you tell if a black Mollie is pregnant? I have two females and one male. Also I have four Zebra Danios, how can you tell the sex of them? They all look alike.

 

[helterskelter]

The dorsal fin (top fin) is much larger in males
Also the anal (fin near the bum) in males is pointed, they can also move this and is what is used when mating.

Your see when they are pregnant, the female gets quite fat and rounded on the body, and when she goes relatively thin then she's given birth.