Can you sex these by colour or body shape?? and does the female change colour like the Xingu pike female! when getting ready to bread!
Like Crenicichla444 said it's best to vent to be sure but at larger sizes 10 inches plus the female develops a red belly. Here's a guide to venting them I sourced and I put up a little while back. In the pic you can see the visual red belly on the female as well as the vent differences.
http://www.monsterfishkeepers.com/forums/showthread.php?603810-Crenicichla-Zebrina-experiences-and-possible-sexing
