Sexing apistogrammas - rule of thumb

[mordor]

Females always got black first rays of ventral fins while males have these fins transparent. It seems to work most of the time even before fish get adult coloration. I was trying to apply this rule on my cara-pintadas. I am a bit confused. I got two sexes for sure but it seems unlikely that biggest one is female.

 

[JerryB]

Yes,
I use to think that the black pelvics were a dead give away for females too but, not so. Well, at least Mike Wise who is a pretty knowledgable guy said it isn't always the case.
I usually get my magnifying glass out and check to see if dorsal is pointed or rounded the pointed is usually male same I believe goes for the anal.
Now if your lucky they will go into spawning mode at a young age and a glowing yellow is a for sure female as you probably already know. Not much help but, I don't count on the black pelvics anymore.
JerryB
www.ApistoWorld.com

 

[Neil]

mordor,
Jerry is right. The black leading edge to the ventral is effective mainly with complimentary information to judge gender. I have seen way too many species that have that black mark in both sexes, especially whe not completely mature. Plus, it is not unusual for sub-dominant males to display numerous female characteristics to avoid punishment.
It definitely should not be overlooked, but it also should not be the only factor you look at! 8O
Hey Jerry, Long time, no post. Good to hear from you again.