I am thinking it is a male as well, but would like someone more knowledgable than me to confirm. I had one of my breeder fish die today and it's privates look exactly the same as what you have pictured. I pulled up this publication and from the pic, think it is a male.
[attachment=1:1h2q3spb]Tilapia Gender.JPG[/attachment:1h2q3spb]
Here is a link to the pdf that I got the pic from. Pretty good reading actually.
https://www.google.com/url?sa=t&rct=...58187178,d.eW0https://www.google.com/url?
Here is another pic: [attachment=0:1h2q3spb]Tilapia Gender Side by Side.JPG[/attachment:1h2q3spb]