No doubt a lugubris-Type pike. All juvies of this group tend to look very similar.But in all these pictures of your pike it apears to have red on the dorsal fin. Sort of doubt it's a C. sp. "venuzuela" as many years ago I owned one, and it never pocessed any red on the dorsal fin , as a juvie or an adult. As well, any pics I have looked at in books or the net, I haven't been able to find one with red on the dorsal.
My guess would be C. strigatta, as all pictures of juvies I have seen show red on the dorsal. Once your fish is older, and looses it's juvie pattern, it might become more obvious what species you have. Here's a link to a picture of a juvie C. strigatta:
http://www.cichlid-forum.com/profiles/species.php?id=1428