Posted by cindy on March 15, 2003 at 08:25:24:
In Reply to: Re: How can i tell if my platy is a girl or a boy posted by kherman on March 15, 2003 at 06:33:13:
...in coloration, but I agree with most of the rest. You still forgot the most obvious difference, the gonopodium.
Females have fan shaped anal fin (on the upper left) and males have a longer, tube shaped anal fin (on the upper right.)