Sexing Killifish

[Big Ben]

Does anyone know how to tell the difference between a male and female killifish? I plan on getting my gf another killi to breed with. Thanks

Ben

 

[Voodoo Chilli]

What species?

 

[Big Ben]

I beleive it is an Aplocheilus lineatus. It's yellow, im positive it is an Aplocheilus. I'm not very familiar with killifish species.

It looks like this:

 

[Voodoo Chilli]

I had those years ago; I believe they were labled as "Golden Wonder" killies.

If I remember correctly, the males were the colorful yellow ones. The females were much plainer looking-- almost to the point of being drab and colorless.