Wow, I have never seen this before! At least not so dramatic. I am a big fan of Trichogaster trichopterus, I have been keeping them for several years. At first glance, I thought it was photo shopped. This fish is just a spawn of female blue Trichogaster trichopterus and male Opouline Trichogaster trichopterus. Of course I'm guessing at the parents sex, I'm basing it off the color variations and my personal experiences with different morphs of the Trichogaster trichopterus. I have witnessed blues get there sripes (opouline stripes) gradually as they grow, just not one half. I personally think there is nothing wrong with this fish. It's actually kinda cool.