Sexual dimorphism in c. trilineatus?

[parrot1974]

Hi all
Just a quick question to check a theory/observation of mine. I have 5 cory trilineatus - 2 males and 3 females. They are all busy spawning at the moment and I don't know whether this affects things. However, I've noticed that my males all have very marked spots on their pelvic fins, whereas the girls have clear or almost clear pelvic fins.
Obviously, five is not enough to make a call on it, but wondered if anyone else had noticed that or had any ideas on it?

[Marine590622]

I have never noticed this, and I suspect that some of the old hands would have over the years, but I do have an actively breeding group, so I will pull them and examine them this evening.

[CarlDeller]

My

Corydoras Paleatus

have the same dimorphism . Wouldn't that just be awesome if it's true for all species and no one really noticed

[Marine590622]

I am not seeing it on a cursory look and I am going to call it a night early tonight, so I am not going to catch them all and do a detailed examination.

[Marine590622]

Last night I tore their tank down and caught them all, on close examination of eleven adults I could not determine sex based on pelvic fin colorization or form.

[parrot1974]

That's a shame. Then it would seem to be coincidence. It would be interesting to hear from more people, either way!