Sexing corydoras sterbai

[William]

I have read that you can tell the sex by their width the wider ones being females and the thinner ones being males, I have taken a couple of pictures from above and hope that maybe I have a mixture but worry that they could just all be males but still be fat from their feast of bloodworms last night )

I did arrows of what I was hoping for but if they're wrong then let me know thanks Incedently I have 4 cories all bought as juveniles at the same time, two appear to definately be larger than the other two.

 

[Gibbo]

Looking from above the females 'shoulder' region should be wider than the males (between pectoral spines). If they're still small though sexing can be a bit difficult m8

 

[clothahump]

Courtesy of Mac.

 

[William]

Thanks guys I think they should be fully grown as I've had them almost a year

 

[Macquatic]

Looking at the pic you may well be right............................but what the hell is that for a substrate Mac.