Video of Oreochromis esculentus I shot while at the Toronto Zoo. This tank was dedicated to some critically endangered species from the Lake Victoria Basin. The Oreochromis esculentus was in breeding dress so it was much more colourful then the rest it shared the tank with.
I should add that the Toronto zoo is involved in a species preservation program for these fish. I often use that photo in discussions about overcrowding/overstocking. There were two tanks like that one, both pristine. They also had a number of bigger specimens in vats.
Narwhal72 wrote: First you would have to eliminate the Nile Perch (probably not possible),
It's the introduction of the Nile Tilapia (Oreochromis niloticus) that out competed O. esculentus in lake Victoria, and caused its extinction. So first you would have to eliminate the Nile Tilapia. The Nile Tilapia is no danger of becoming extinct, any time soon, because of the Nile perch so I don't see why the Nile perch should be viewed as the problem for re-introducing the very similar native Oreochromis species.