Diadema - Do I have a couple?

[Miguel Monteiro]

Can anyone help sexing my diadema. I bought them as a couple, but I do not see major differences.

I think this is the male, because it's dominate

And this must be the female

Thanks

 

[HrHagel]

No idea, but those are lookers!

 

[darth pike]

Literature states this species has no sexual dimorphism, so I am thinking venting would be the only way to tell for sure. The top fish has noticably longer fins, but that is usually a sign of dominance. The lower fish seems much more full in the stomach area, usually a female trait ... especially if not the dominate fish and not getting as much to eat.

 

[Miguel Monteiro]

Thank's you for sharing. It's really hard to sex them, and the strange thing is that the female (I think) is slightly larger than the supposed male.

 

[Adhlc]

Beautiful Diadema you have there. The body shape of the second one looks to be a bit more plump and round - which could indicate a female.