If she's not, that is one HUGE male. I would have to see a perch photo that is the easiest way for me to tell....not something I can explain, it's just once you see a hundred or so chondros you start to see the differences between males and females. How they act how they feed how they perch etc. Not to say its 100% but I'm usually at about 98% and if you really want to know for sure simply look at her shed....see sperm plugs? If you do its a boy! And if you don't more than likely a girl