Al, here's pictures of M/F ID for sexing your Mozambique tilapia. Overton's hands on ID for my photos many years ago. I have stocked tilapia for so many years, I take them for granted...
Male Mozambique Tilapia
Female Mozambique tilapia
N.E. Texas 2 acre and 1/4 acre ponds Original george #173 (22 June 2002)