ID this Amazonian fish from vague description

I saw this in an aquarium recently, but didn’t catch the name. It’s one of the usual Amazon suspects, though:

It’s body is eel-like, not much in the way of fins, but it does have a somewhat short dorsal fin running down about the last 1/3 of its body.

I seem to recall it has a “c” in the name, but that doesn’t help much. The only one I could think of was “pacu,” and I know it wasn’t that.

The infamous candiru?

Found it. Thanks anyway. Pirarucu

national geographic channel recently had a show about giant fish in the amazon and that one was featured.