Yeah man, I googled it and it really look like sveni, even the stress coloration. But its a bit strange since sveni is from amazon, and they are in a completely different river. As I said in another topic, fishes were introduced here, but this pike has no economical importance here, so it doesnt make sense of it being introduced here.
Man, I got then in Pacoti river. Its a river in Ceará, in northeast of brazil. It's in portuguese, but.. http://pt.wikipedia.org/wiki/Rio_Pacoti
Prob there are no references of this river it in literature for pike cichlids.
Wicked awesome pike!!! Saxatilis group pikes can be a hassle to ID sometimes. Yours is looking like Crenicichla sp. menezesi, but from your locality, its possible it could also be a variant of Crenicichla lepitoda. I'm personally leaning more towards menezesi though. . .