Jacundá (pike cichlid or mataguaro), are common in Amazonian Brazil, Venezuela and Columbia.   This smaller close cousin of the peacock bass is represented in peacock waters by several species in the genus Crenicichla.  Although Crenicichla species vary widely in coloration and markings, they are remarkably similar in form and habit within central Amazonian waters.  Although like oscars, jacundá don't get terribly large (under 5-pounds) they'll sometimes aggressively take many of the same black bass-sized lures and flies used for peacocks. 

Jacunda relate strongly to structure and strike very powerfully for their size.  They fight with strong, short runs and an intense, bulldog-like style.   On an ultralight casting/spinning rod or 5 - weight fly-rod and floating line, both jacunda and oscars are great fun to catch.