Platy ?

[ufdff15]

I have 4 Red Wag platies and yesterday 2 of them kept going after each other to the point that each of them have damage to their fins, tonight 3 of the 4 are hanging out at the top of the tank and one is hanging out at the bottom. The one at the bottom is a female(i think) and is rather large. I think that i have 2 male and 2 female. Is there any other way to tell other than their "lower" fin?

 

[MargieMay06]

Not really, except that the fat ones are probably females holding fry.

 

[Jericho]

Not really, they claim that "Sex can be easily determined by the male's modified anal fin (gonopodium). Females grow larger and have a more rounded body." Now if you know what that means more power to you...

 

[Raskolnikov]

This is the gonopodium of a male livebearer:

It is absent in females.

 

[MargieMay06]

Once you get used to the difference, it really is easy to tell. It's hard at first, but you do eventually realize that a female's fin that is close to her body looks nothing like a gonopodium.